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    Android&iOS&Windows&Mac

    Last updated: 2024-07-05 15:24:08
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      Feature Description

      The API for pulling historical messages is in the V2TIMManager and V2TIMManager+Message (for iOS and macOS) and V2TIMMessageManager (Android and Windows) classes.
      In addition to the support for pulling historical one-to-one and group messages, an advanced API is provided to pull messages by sequence, start point, or time range.
      Both local and cloud historical messages can be pulled.
      Note:
      When historical messages are pulled from the cloud and a network exception is noticed, the SDK will return the locally stored historical messages.
      Locally stored historical messages are not subject to time limits, but those stored in the cloud are subject to the following time limits:
      Developer edition: The free storage period is 7 days and cannot be extended.
      Standard edition: The free storage period is 7 days and can be extended.
      Premium edition: The free storage period is 30 days and can be extended.
      Note:
      It is a value-added service to extend the storage period of historical messages. If you need this feature, please contact us in Telegram technical group.
      Rich media messages (such as images, files, and audios) have the same storage periods as historical messages.

      Pulling One-to-One Messages

      Call the getC2CHistoryMessageList API (Android / iOS and macOS) to get historical one-to-one messages. When the network is normal, the latest cloud data will be pulled; when it is abnormal, the SDK will return the locally stored historical messages.
      If you want to pull only local historical messages, see Advanced API. This API supports pulling by page. For more information, see Pulling by page.
      Sample code:
      Android
      iOS and macOS
      // Pull historical one-to-one messages
      // Set `lastMsg` to `null` for the first pull
      // `lastMsg` can be the last message in the returned message list for the second pull.
      V2TIMManager.getMessageManager().getC2CHistoryMessageList(#your user id#, 20, null, new V2TIMValueCallback<List<V2TIMMessage>>() {
          @Override
          public void onError(int code, String desc) {
              Log.i("imsdk", "fail, " + code + ", " + desc);
          }
      
          @Override
          public void onSuccess(List<V2TIMMessage> v2TIMMessages) {
              // Record the `lastMsg` for the next pull
              V2TIMMessage lastMsg = v2TIMMessages.get(v2TIMMessages.size() - 1);
              Log.i("imsdk", "success");
          }
      });
      // Pull historical one-to-one messages
      // Set `lastMsg` to `nil` for the first pull
      // `lastMsg` can be the last message in the returned message list for the second pull.
      [V2TIMManager.sharedInstance getC2CHistoryMessageList:#your user id# count:20 lastMsg:nil succ:^(NSArray<V2TIMMessage *> *msgs) {
          // Record the `lastMsg` for the next pull
          V2TIMMessage *lastMsg = msgs.lastObject;
          NSLog(@"success, %@", msgs);
      } fail:^(int code, NSString *desc) {
          NSLog(@"fail, %d, %@", code, desc);
      }];

      Pulling Group Messages

      Call the getGroupHistoryMessageList API (Android / iOS and macOS) to get historical group messages. When the network is normal, the latest cloud data will be pulled; when it is abnormal, the SDK will return the locally stored historical messages.
      If you want to pull only local historical messages, see Advanced API. This API supports pulling by page. For more information, see Pulling by page.
      Note:
      Only the historical messages of meeting groups (Meeting) can be pulled. For more information on group message limits, see Differences in message capabilities.
      This API does not apply to audio-video groups (AVChatRoom), as their messages are not stored on the cloud roaming server or in the local database. If you use the Premium edition, you can configure Message History for New Members (Path：Applications > Your App > Chat > Configuration > Group Configuration > Group feature configuration > Message History for New Members > Previous Messages Viewable) in the Console to get historical messages in the onRecvNewMessage callback after successfully joining the audio-video group. New members of an audio-video group can view up to 20 messages in the past 24 hours before they join the group.
      Sample code:
      Android
      iOS and macOS
      // Pull historical group messages
      // Set `lastMsg` to `null` for the first pull
      // `lastMsg` can be the last message in the returned message list for the second pull.
      V2TIMManager.getMessageManager().getGroupHistoryMessageList(#your group id#, 20, null, new V2TIMValueCallback<List<V2TIMMessage>>() {
          @Override
          public void onError(int code, String desc) {
              Log.i("imsdk", "fail, " + code + ", " + desc);
          }
      
          @Override
          public void onSuccess(List<V2TIMMessage> v2TIMMessages) {
              // Record the `lastMsg` for the next pull
              V2TIMMessage lastMsg = v2TIMMessages.get(v2TIMMessages.size() - 1);
              Log.i("imsdk", "success");
          }
      });
      // Pull historical group messages
      // Set `lastMsg` to `null` for the first pull
      // `lastMsg` can be the last message in the returned message list for the second pull.
      [V2TIMManager.sharedInstance getGroupHistoryMessageList:#your group id# count:20 lastMsg:nil succ:^(NSArray<V2TIMMessage *> *msgs) {
          // Record the `lastMsg` for the next pull
          V2TIMMessage *lastMsg = msgs.lastObject;
          NSLog(@"success, %@", msgs);
      } fail:^(int code, NSString *desc) {
          NSLog(@"fail, %d, %@", code, desc);
      }];

      Advanced Features

      Advanced API

      If the ordinary API above cannot meet your needs to pull historical messages, you can use the advanced API getHistoryMessageList (Android / iOS and macOS / Windows).
      In addition to pulling historical one-to-one and group messages, this API supports the following advanced features:
      Set the start point for message pull
      Set the time range for message pull
      Set the source for message pull: pull from the local database or the cloud
      Specify the sequence for message pull: pull in reverse chronological order or in chronological order
      Specify the message type for local pull: text, image, audio, video, file, emoji, group tip, merged, or custom message.
      API prototype:
      Android
      iOS and macOS
      Windows
      public abstract void getHistoryMessageList(V2TIMMessageListGetOption option, V2TIMValueCallback<List<V2TIMMessage>> callback);
      - (void)getHistoryMessageList:(V2TIMMessageListGetOption *)option
                               succ:(V2TIMMessageListSucc)succ
                               fail:(V2TIMFail)fail;
      virtual void GetHistoryMessageList(const V2TIMMessageListGetOption& option,
                                         V2TIMValueCallback<V2TIMMessageVector>* callback) = 0;
      The parameters of the V2TIMMessageListGetOptionclass are as described below:
      Parameter
      Description
      Valid for One-to-One Chat
      Valid for Group Chat
      Required
      Remarks
      getType
      Source and sequence of the message pull, which can be set to local/cloud and reverse chronological order/chronological order respectively.
      YES
      YES
      YES
      When the pull source is set to the cloud, the local message list and cloud message list will be merged and returned. If there is no network connection, the local message list will be returned.
      userID
      The specified user ID with which to pull historical one-to-one messages
      YES
      NO
      NO
      To pull one-to-one messages with a certain user, you need to specify only the userID.
      groupID
      The specified group ID with which to pull historical group messages
      NO
      YES
      NO
      To pull group messages from a certain group, you need to specify only the groupID.
      count
      Number of messages per pull
      YES
      YES
      YES
      We recommend you set it to 20; otherwise, the pull speed may be affected.
      messageTypeList
      Pulled message type set
      YES
      YES
      NO
      1. It is supported only for local pull, that is, it is valid only when getType is V2TIM_GET_LOCAL_OLDER_MSG or V2TIM_GET_LOCAL_NEWER_MSG.
      2. If this field is left empty, messages of all types will be pulled.
      3. For more information on the supported message types, see V2TIMElemType (Android / iOS and macOS / Windows).
      lastMsg
      Last message
      YES
      YES
      NO
      This parameter applies to historical message pull.
      1. It can be used for both one-to-one and group chats.
      2. If it is set as the start point for the message pull, the message will not be included in the returned message list.
      3. If it is left empty, the latest message in the conversation will be used as the start point for pull.
      lastMsgSeq
      seq of the last message
      NO
      YES
      NO
      This parameter applies to historical message pull or locating.
      1. It can be used only for group chats.
      2. If it is set as the start point for the message pull, the message will be included in the returned message list.
      3. If both lastMsg and lastMsgSeq are specified, the SDK will use lastMsg.
      4. If neither lastMsg nor lastMsgSeq is specified, the start point for pull will be determined based on whether the getTimeBegin is set. If yes, the set range will be used as the start point; if no, the latest message will be used as the start point.
      getTimeBegin
      Start time for the message pull. It is a UTC timestamp in seconds.
      YES
      YES
      NO
      It defaults to 0, indicating to pull messages from the current time.
      getTimePeriod
      Time range for the message pull in seconds.
      YES
      YES
      NO
      1. It defaults to 0, indicating that there is no time range limit.
      2. It is a closed range including the start and end time:
      If getType specifies the reverse chronological order, the time range is [getTimeBegin - getTimePeriod, getTimeBegin].
      If getType specifies the chronological order, the time range is [getTimeBegin, getTimeBegin + getTimePeriod].

      Pulling by page

      Historical one-to-one message pull, historical group message pull, and pull via the advanced API can all be paged by using lastMsg and count:
      1. For the first pull, leave lastMsg empty. In this case, the SDK will pull the latest message.
      2. If it is not the first pull, use the last message in the message list from the last pull as the lastMsg. In this case, the lastMsg will not be included in the returned message list.
      3. If the message list returned in the successful callback is empty, it means that pulling completed and there is no more data.
      Note:
      1. In the pulled message list, newer messages are more forward.
      2. We recommend you set count to 20 to enhance the loading efficiency and save network traffic.
      If you use lastMsgSeq to pull historical messages, the message corresponding to lastMsgSeq will be included in the returned message list. Therefore, we recommend you not use lastMsgSeq if you are not pulling historical group messages for the first time (subsequent pull); otherwise, the same message may be pulled repeatedly. For example, there are eight historical messages: msg1, msg2, msg3, msg4, msg5, msg6, msg7, and msg8. If four messages are pulled each time, you will get msg1, msg2, msg3, and msg4 for the first pull. If you use the lastMsgSeq of msg4 to start another pull, msg4, msg5, msg6, and msg7 will be pulled. In this case, msg4 is pulled twice. If you need to use lastMsgSeq for subsequent pulls, we recommend you set the logic of message deduplication.

      Pulling by time range

      You can set getTimeBegin and getTimePeriod to specify the time range for the message pull. The start and end timestamps of the time range are related to getType, as shown below:
      
      
      
      The following sample code demonstrates the process of pulling cloud group messages of the whole day from 2022-01-01 00:00:00 (the timestamp is 1640966400) in reverse chronological order.
      Android
      iOS and macOS
      Windows
      V2TIMMessageListGetOption option = new V2TIMMessageListGetOption();
      option.setGetType(V2TIMMessageListGetOption.V2TIM_GET_CLOUD_OLDER_MSG); // Pull older cloud messages
      option.setGetTimeBegin(1640966400);         // Start from 2022-01-01 00:00:00
      option.setGetTimePeriod(1 * 24 * 60 * 60);  // Pull the messages of the whole day
      option.setCount(Integer.MAX_VALUE);         // Return all the messages within the time range
      option.setGroupID(#you group id#);          // Pull group messages
      V2TIMManager.getMessageManager().getHistoryMessageList(option, new V2TIMValueCallback<List<V2TIMMessage>>() {
          @Override
          public void onSuccess(List<V2TIMMessage> v2TIMMessages) {
              Log.i("imsdk", "success");
          }
      
          @Override
          public void onError(int code, String desc) {
              Log.i("imsdk", "failure, code:" + code + ", desc:" + desc);
          }
      });
      V2TIMMessageListGetOption *option = [[V2TIMMessageListGetOption alloc] init];
      option.getType = V2TIM_GET_CLOUD_OLDER_MSG; // Pull cloud messages in reverse chronological order
      option.getTimeBegin = 1640966400;        // Start from 2022-01-01 00:00:00
      option.getTimePeriod = 1 * 24 * 60 * 60; // Pull the messages of the whole day
      option.count = INT_MAX;                  // Return all the messages within the time range
      option.groupID = #your group id#;        // Pull group messages
      [V2TIMManager.sharedInstance getHistoryMessageList:option succ:^(NSArray<V2TIMMessage *> *msgs) {
          NSLog(@"success");
      } fail:^(int code, NSString *desc) {
          NSLog(@"failure, code:%d, desc:%@", code, desc);
      }];
      template <class T>
      class ValueCallback final : public V2TIMValueCallback<T> {
      public:
          using SuccessCallback = std::function<void(const T&)>;
          using ErrorCallback = std::function<void(int, const V2TIMString&)>;
      
          ValueCallback() = default;
          ~ValueCallback() override = default;
      
          void SetCallback(SuccessCallback success_callback, ErrorCallback error_callback) {
              success_callback_ = std::move(success_callback);
              error_callback_ = std::move(error_callback);
          }
      
          void OnSuccess(const T& value) override {
              if (success_callback_) {
                  success_callback_(value);
              }
          }
          void OnError(int error_code, const V2TIMString& error_message) override {
              if (error_callback_) {
                  error_callback_(error_code, error_message);
              }
          }
      
      private:
          SuccessCallback success_callback_;
          ErrorCallback error_callback_;
      };
      
      V2TIMMessageListGetOption option;
      option.getType = V2TIMMessageGetType::V2TIM_GET_CLOUD_OLDER_MSG;  // Pull older cloud messages
      option.getTimeBegin = 1640966400;        // Start from 2022-01-01 00:00:00
      option.getTimePeriod = 1 * 24 * 60 * 60;                          // Pull the messages of the whole day
      option.count = std::numeric_limits<uint64_t>::max();              // Return all the messages within the time range
      option.groupID = "your group id";                                 // Pull group messages
      
      auto callback = new ValueCallback<V2TIMMessageVector>{};
      callback->SetCallback(
          [=](const V2TIMMessageVector& messageList) {
              std::cout << "success" << std::endl;
              delete callback;
          },
          [=](int error_code, const V2TIMString& error_message) {
              std::cout << "error" << std::endl;
              delete callback;
          });
      
      V2TIMManager::GetInstance()->GetMessageManager()->GetHistoryMessageList(option, callback);

      Pulling by page within the time range

      You can specify both the time range and lastMsg/lastMsgSeq for the message pull at the same time. And the SDK will respond as follows:
      1. If both getTimeBegin/getTimePeriod and lastMsg/lastMsgSeq are set, the overlapping part of the messages pulled based on the start message and the messages pulled based on the time range will be returned.
      2. If neither getTimeBegin/getTimePeriod nor lastMsg/lastMsgSeq is set, messages will be pulled from the latest message based on the sequence and method specified by getType.
      The following sample code demonstrates the process of pulling cloud group messages by page (20 messages per page) from 2022-01-01 00:00:00 (the timestamp is 1640966400) in reverse chronological order.
      Android
      iOS and macOS
      Windows
      // Define a variable to record the cursor of each pull
      private V2TIMMessage m_lastMsg = null;  // It is `null` for the first pull.
      
      // Logic of pulling by page
      V2TIMMessageListGetOption option = new V2TIMMessageListGetOption();
      option.setGetType(V2TIMMessageListGetOption.V2TIM_GET_CLOUD_OLDER_MSG); // Pull older cloud messages
      option.setGetTimeBegin(1640966400);         // Start from 2022-01-01 00:00:00
      option.setGetTimePeriod(1 * 24 * 60 * 60);  // Pull the messages of the whole day
      option.setCount(20);                        // 20 messages per page
      option.setLastMsg(m_lastMsg);               // Position of the last pull (the last message in the returned message list each time)
      option.setGroupID(#you group id#);          // Pull group messages
      V2TIMManager.getMessageManager().getHistoryMessageList(option, new V2TIMValueCallback<List<V2TIMMessage>>() {
          @Override
          public void onSuccess(List<V2TIMMessage> v2TIMMessages) {
              Log.i("imsdk", "success");
              // Record the `lastMsg` for the next pull
              m_lastMsg = v2TIMMessages.get(v2TIMMessages.size() - 1);
          }
      
          @Override
          public void onError(int code, String desc) {
              Log.i("imsdk", "failure, code:" + code + ", desc:" + desc);
          }
      });
      // Define a variable to record the cursor of each pull
      @property (nonatomic, copy) V2TIMMessage *lastMsg;
      
      // Logic of pulling by page
      V2TIMMessageListGetOption *option = [[V2TIMMessageListGetOption alloc] init];
      option.getType = V2TIM_GET_CLOUD_OLDER_MSG; // Pull cloud messages in reverse chronological order
      option.getTimeBegin = 1640966400;        // Start from 2022-01-01 00:00:00
      option.getTimePeriod = 1 * 24 * 60 * 60; // Pull the messages of the whole day
      option.count = 20;                       // 20 messages per page
      option.lastMsg = self.lastMsg;           // Position of the last pull (the last message in the returned message list each time)
      option.groupID = #your group id#;        // Pull group messages
      __weak typeof(self) weakSelf = self;
      [V2TIMManager.sharedInstance getHistoryMessageList:option succ:^(NSArray<V2TIMMessage *> *msgs) {
          NSLog(@"success");
          // Record the `lastMsg` for the next pull
          weakSelf.lastMsg = msgs.lastObject;
      } fail:^(int code, NSString *desc) {
          NSLog(@"failure, code:%d, desc:%@", code, desc);
      }];
      template <class T>
      class ValueCallback final : public V2TIMValueCallback<T> {
      public:
          using SuccessCallback = std::function<void(const T&)>;
          using ErrorCallback = std::function<void(int, const V2TIMString&)>;
      
          ValueCallback() = default;
          ~ValueCallback() override = default;
      
          void SetCallback(SuccessCallback success_callback, ErrorCallback error_callback) {
              success_callback_ = std::move(success_callback);
              error_callback_ = std::move(error_callback);
          }
      
          void OnSuccess(const T& value) override {
              if (success_callback_) {
                  success_callback_(value);
              }
          }
          void OnError(int error_code, const V2TIMString& error_message) override {
              if (error_callback_) {
                  error_callback_(error_code, error_message);
              }
          }
      
      private:
          SuccessCallback success_callback_;
          ErrorCallback error_callback_;
      };
      
      // Define a variable to record the cursor of each pull
      V2TIMMessage lastMsg;
      
      // Logic of pulling by page
      V2TIMMessageListGetOption option;
      option.getType = V2TIMMessageGetType::V2TIM_GET_CLOUD_OLDER_MSG;  // Pull older cloud messages
      option.getTimeBegin = 1640966400;        // Start from 2022-01-01 00:00:00
      option.getTimePeriod = 1 * 24 * 60 * 60;                          // Pull the messages of the whole day
      option.count = 20;                                                // 20 messages per page
      option.lastMsg = First pull? nullptr : &lastMsg;  // Position of the last pull (the last message in the returned message list each time)
      option.groupID = "your group id";  // Pull group messages
      
      auto callback = new ValueCallback<V2TIMMessageVector>{};
      callback->SetCallback(
          [=](const V2TIMMessageVector& messageList) mutable {
              std::cout << "success" << std::endl;
              // Record the `lastMsg` for the next pull
              lastMsg = messageList[messageList.Size() - 1];
              delete callback;
          },
          [=](int error_code, const V2TIMString& error_message) {
              std::cout << "error" << std::endl;
              delete callback;
          });
      
      V2TIMManager::GetInstance()->GetMessageManager()->GetHistoryMessageList(option, callback);

      Pulling only local messages

      Set getType to pull only local messages:
      When getType is set to V2TIM_GET_LOCAL_OLDER_MSG, locally stored messages will be pulled in reverse chronological order.
      When getType is set to V2TIM_GET_LOCAL_NEWER_MSG, locally stored messages will be pulled in chronological order.
      The following sample code demonstrates the process of pulling 20 one-to-one messages from the local database in reverse chronological order, starting from the latest message:
      Android
      iOS and macOS
      Windows
      V2TIMMessageListGetOption option = new V2TIMMessageListGetOption();
      option.setGetType(V2TIMMessageListGetOption.V2TIM_GET_LOCAL_OLDER_MSG); // Pull local messages in reverse chronological order
      option.setLastMsg(null);            // Set to pull from the latest message
      option.setCount(20);                // Pull 20 messages
      option.setUserID(#you user id#);    // Pull one-to-one messages
      V2TIMManager.getMessageManager().getHistoryMessageList(option, new V2TIMValueCallback<List<V2TIMMessage>>() {
          @Override
          public void onSuccess(List<V2TIMMessage> v2TIMMessages) {
              Log.i("imsdk", "success");
          }
      
          @Override
          public void onError(int code, String desc) {
              Log.i("imsdk", "failure, code:" + code + ", desc:" + desc);
          }
      });
      V2TIMMessageListGetOption *option = [[V2TIMMessageListGetOption alloc] init];
      option.getType = V2TIM_GET_LOCAL_OLDER_MSG; // Pull local messages in reverse chronological order
      option.lastMsg = nil;            // Set to pull from the latest message
      option.count = 20;               // Pull 20 messages
      option.userID = #your user id#;  // Pull one-to-one messages
      [V2TIMManager.sharedInstance getHistoryMessageList:option succ:^(NSArray<V2TIMMessage *> *msgs) {
          NSLog(@"success");
      } fail:^(int code, NSString *desc) {
          NSLog(@"failure, code:%d, desc:%@", code, desc);
      }];
      template <class T>
      class ValueCallback final : public V2TIMValueCallback<T> {
      public:
          using SuccessCallback = std::function<void(const T&)>;
          using ErrorCallback = std::function<void(int, const V2TIMString&)>;
      
          ValueCallback() = default;
          ~ValueCallback() override = default;
      
          void SetCallback(SuccessCallback success_callback, ErrorCallback error_callback) {
              success_callback_ = std::move(success_callback);
              error_callback_ = std::move(error_callback);
          }
      
          void OnSuccess(const T& value) override {
              if (success_callback_) {
                  success_callback_(value);
              }
          }
          void OnError(int error_code, const V2TIMString& error_message) override {
              if (error_callback_) {
                  error_callback_(error_code, error_message);
              }
          }
      
      private:
          SuccessCallback success_callback_;
          ErrorCallback error_callback_;
      };
      
      V2TIMMessageListGetOption option;
      option.getType = V2TIMMessageGetType::V2TIM_GET_LOCAL_OLDER_MSG;  // Pull older local messages
      option.count = 20;                                                // Pull 20 messages
      option.userID = "you user id";                                    // Pull one-to-one messages
      
      auto callback = new ValueCallback<V2TIMMessageVector>{};
      callback->SetCallback(
          [=](const V2TIMMessageVector& messageList) mutable {
              std::cout << "success" << std::endl;
              delete callback;
          },
          [=](int error_code, const V2TIMString& error_message) {
              std::cout << "error" << std::endl;
              delete callback;
          });
      
      V2TIMManager::GetInstance()->GetMessageManager()->GetHistoryMessageList(option, callback);

      Pulling messages of a specified type

      The SDK defines common message types, such as text, image, and video messages. For more information, see V2TIMElemType (Android / iOS and macOS / Windows). The advanced API getHistoryMessageList allows setting messageTypeList to specify the message type for pull.
      Note:
      1. When messageTypeList is left empty, messages of all types will be pulled.
      2. The message type can be specified only for the local pull but not for the cloud pull.
      The following sample code demonstrates the process of pulling 20 text and image messages in reverse chronological order, starting from the current time:
      Android
      iOS and macOS
      Windows
      // Pull image and text messages
      ArrayList<Integer> messageTypeList = new ArrayList<Integer>();
      messageTypeList.add(V2TIM_ELEM_TYPE_IMAGE);
      messageTypeList.add(V2TIM_ELEM_TYPE_TEXT);
      
      V2TIMMessageListGetOption option = new V2TIMMessageListGetOption();
      option.setGetType(V2TIMMessageListGetOption.V2TIM_GET_CLOUD_OLDER_MSG); // Pull older cloud messages
      option.setCount(20);
      option.setMessageTypeList(messageTypeList);
      option.setGroupID("you group id");
      V2TIMManager.getMessageManager().getHistoryMessageList(option, new V2TIMValueCallback<List<V2TIMMessage>>() {
          @Override
          public void onSuccess(List<V2TIMMessage> v2TIMMessages) {
              Log.i("imsdk", "success");
          }
      
          @Override
          public void onError(int code, String desc) {
              Log.i("imsdk", "failure, code:" + code + ", desc:" + desc);
          }
      });
      V2TIMMessageListGetOption *option = [[V2TIMMessageListGetOption alloc] init];
      option.getType = V2TIM_GET_CLOUD_OLDER_MSG;
      // Pull image and text messages
      option.messageTypeList = @[@(V2TIM_ELEM_TYPE_IMAGE), @(V2TIM_ELEM_TYPE_TEXT)];
      option.count = 20;
      option.groupID = @"your group id";
      [V2TIMManager.sharedInstance getHistoryMessageList:option succ:^(NSArray<V2TIMMessage *> *msgs) {
          NSLog(@"success");
      } fail:^(int code, NSString *desc) {
          NSLog(@"failure, code:%d, desc:%@", code, desc);
      }];
      template <class T>
      class ValueCallback final : public V2TIMValueCallback<T> {
      public:
          using SuccessCallback = std::function<void(const T&)>;
          using ErrorCallback = std::function<void(int, const V2TIMString&)>;
      
          ValueCallback() = default;
          ~ValueCallback() override = default;
      
          void SetCallback(SuccessCallback success_callback, ErrorCallback error_callback) {
              success_callback_ = std::move(success_callback);
              error_callback_ = std::move(error_callback);
          }
      
          void OnSuccess(const T& value) override {
              if (success_callback_) {
                  success_callback_(value);
              }
          }
          void OnError(int error_code, const V2TIMString& error_message) override {
              if (error_callback_) {
                  error_callback_(error_code, error_message);
              }
          }
      
      private:
          SuccessCallback success_callback_;
          ErrorCallback error_callback_;
      };
      
      V2TIMMessageListGetOption option;
      option.getType = V2TIMMessageGetType::V2TIM_GET_CLOUD_OLDER_MSG;  // Pull older cloud messages
      option.count = 20;                                                // Pull 20 messages
      option.messageTypeList.PushBack(V2TIMElemType::V2TIM_ELEM_TYPE_IMAGE);  // Pull image messages
      option.messageTypeList.PushBack(V2TIMElemType::V2TIM_ELEM_TYPE_TEXT);   // Pull text messages
      option.userID = "you group id";                                         // Pull group messages
      
      auto callback = new ValueCallback<V2TIMMessageVector>{};
      callback->SetCallback(
          [=](const V2TIMMessageVector& messageList) mutable {
              std::cout << "success" << std::endl;
              delete callback;
          },
          [=](int error_code, const V2TIMString& error_message) {
              std::cout << "error" << std::endl;
              delete callback;
          });
      
      V2TIMManager::GetInstance()->GetMessageManager()->GetHistoryMessageList(option, callback);

      Pulling messages of a specified sequence

      When polling historical messages in group chats, you can poll according to the specified message sequence.
      Note:
      It is only valid when pulling group history messages;
      The message sequence can be obtained through the seq field of the V2TIMMessage object;
      When getType is set to poll from the cloud, the local stored message list and the cloud stored message list will be merged and returned; if there is no network, the local message list will be returned directly;
      When getType is set to poll from local, the local message list will be returned directly;
      When getType is set to poll older messages, the message list is in reverse chronological order, i.e., messages are sorted from large to small by timestamp;
      When getType is set to poll updated messages, the message list is in chronological order, i.e., messages are sorted from small to large by timestamp.
      The sample code will demonstrate: In the group, poll messages with sequence 1, 3, 5, and 9 from the cloud, and return the messages in reverse chronological order.
      Android
      iOS & Mac
      Windows
      ArrayList<Long> sequenceList = new ArrayList<>();
      sequenceList.add(1L);
      sequenceList.add(3L);
      sequenceList.add(5L);
      sequenceList.add(9L);
      V2TIMMessageListGetOption option = new V2TIMMessageListGetOption();
      option.setGroupID("your groupID");
      option.setMessageSeqList(sequenceList);
      option.setGetType(V2TIMMessageListGetOption.V2TIM_GET_CLOUD_OLDER_MSG;);
      V2TIMManager.getMessageManager().getHistoryMessageList(option, new V2TIMValueCallback<List<V2TIMMessage>>() {
          @Override
          public void onSuccess(List<V2TIMMessage> v2TIMMessages) {
      
          }
      
          @Override
          public void onError(int code, String desc) {
      
          }
      });
      V2TIMMessageListGetOption *option = [[V2TIMMessageListGetOption alloc] init];
      option.getType = V2TIM_GET_CLOUD_OLDER_MSG;
      option.groupID = @"your groupID";
      option.messageSeqList = @[@(1), @(3), @(5), @(9)];
      [V2TIMManager.sharedInstance getHistoryMessageList:option succ:^(NSArray<V2TIMMessage *> *msgs) {
      
      } fail:^(int code, NSString *desc) {
      
      }];
      template <class T>
      class ValueCallback final : public V2TIMValueCallback<T> {
      public:
          using SuccessCallback = std::function<void(const T&)>;
          using ErrorCallback = std::function<void(int, const V2TIMString&)>;
      
          ValueCallback() = default;
          ~ValueCallback() override = default;
      
          void SetCallback(SuccessCallback success_callback, ErrorCallback error_callback) {
              success_callback_ = std::move(success_callback);
              error_callback_ = std::move(error_callback);
          }
      
          void OnSuccess(const T& value) override {
              if (success_callback_) {
                  success_callback_(value);
              }
          }
          void OnError(int error_code, const V2TIMString& error_message) override {
              if (error_callback_) {
                  error_callback_(error_code, error_message);
              }
          }
      
      private:
          SuccessCallback success_callback_;
          ErrorCallback error_callback_;
      };
      
      V2TIMUInt64Vector sequence_list;
      sequence_list.PushBack(1);
      sequence_list.PushBack(3);
      sequence_list.PushBack(5);
      sequence_list.PushBack(9);
      V2TIMMessageListGetOption option;
      option.getType = V2TIMMessageGetType::V2TIM_GET_CLOUD_OLDER_MSG;
      option.messageSeqList = sequence_list;
      option.groupID = "your group id";
      
      auto callback = new ValueCallback<V2TIMMessageVector>{};
      callback->SetCallback(
          [=](const V2TIMMessageVector& messageList) {
              std::cout << "success" << std::endl;
              delete callback;
          },
          [=](int error_code, const V2TIMString& error_message) {
              std::cout << "error" << std::endl;
              delete callback;
          });
      
      V2TIMManager::GetInstance()->GetMessageManager()->GetHistoryMessageList(option, callback);

      Quick redirection to a group @ message

      After a user receives a group @ message in a group conversation, the user generally needs to click the @ bar to go to the message and pull the neighboring messages for display. As the group @ message also needs to be displayed, you can set its sequence as the lastMsgSeq and use the advanced API getHistoryMessageList to pull messages.
      The following sample code demonstrates the process of clicking the @ bar, redirecting to the group @ message, and pulling the first 20 messages earlier and later than that message for display:
      Android
      iOS and macOS
      Windows
      // Get the `sequence` of the group @ message
      long atSequence = 1081;
      
      // Pull the group @ message and earlier messages
      V2TIMMessageListGetOption beforeOption = new V2TIMMessageListGetOption();
      beforeOption.setGetType(V2TIMMessageListGetOption.V2TIM_GET_CLOUD_OLDER_MSG); // Pull messages earlier than the group @ message
      beforeOption.setCount(20);                        // Pull 20 messages
      beforeOption.setLastMsgSeq(atSequence);           // Start the pull from the group @ message, which is included in the pull list
      beforeOption.setGroupID(#you group id#);          // Pull group messages
      V2TIMManager.getMessageManager().getHistoryMessageList(beforeOption, new V2TIMValueCallback<List<V2TIMMessage>>() {
          @Override
          public void onSuccess(List<V2TIMMessage> v2TIMMessages) {
              // The group @ message is included in the returned message list.
              Log.i("imsdk", "success");
          }
      
          @Override
          public void onError(int code, String desc) {
              Log.i("imsdk", "failure, code:" + code + ", desc:" + desc);
          }
      });
      
      // Pull messages later than the group @ message
      V2TIMMessageListGetOption afterOption = new V2TIMMessageListGetOption();
      afterOption.setGetType(V2TIMMessageListGetOption.V2TIM_GET_CLOUD_NEWER_MSG); // Pull messages later than the group @ message
      afterOption.setCount(20);                        // Pull 20 messages
      afterOption.setLastMsgSeq(atSequence + 1);       // Start the pull from the first message later than the group @ message, which is not included in the pull list
      afterOption.setGroupID(#you group id#);          // Pull group messages
      V2TIMManager.getMessageManager().getHistoryMessageList(afterOption, new V2TIMValueCallback<List<V2TIMMessage>>() {
          @Override
          public void onSuccess(List<V2TIMMessage> v2TIMMessages) {
              // The group @ message is not included in the returned message list.
              Log.i("imsdk", "success");
          }
      
          @Override
          public void onError(int code, String desc) {
              Log.i("imsdk", "failure, code:" + code + ", desc:" + desc);
          }
      });
      // Get the `sequence` of the group @ message
      NSInteger atSequence = 1081;
      
      // Pull the group @ message and earlier messages
      V2TIMMessageListGetOption *beforeOption = [[V2TIMMessageListGetOption alloc] init];
      beforeOption.getType = V2TIM_GET_CLOUD_OLDER_MSG; // Pull messages earlier than the group @ message
      beforeOption.count = 20;                          // Pull 20 messages
      beforeOption.lastMsgSeq = atSequence;             // Start the pull from the group @ message, which is included in the pull list
      beforeOption.groupID = #your group id#;           // Pull group messages
      [V2TIMManager.sharedInstance getHistoryMessageList:beforeOption succ:^(NSArray<V2TIMMessage *> *msgs) {
          // The group @ message is included in the returned message list.
          NSLog(@"success");
      } fail:^(int code, NSString *desc) {
          NSLog(@"failure, code:%d, desc:%@", code, desc);
      }];
      
      // Pull messages later than the group @ message
      V2TIMMessageListGetOption *afterOption = [[V2TIMMessageListGetOption alloc] init];
      afterOption.getType = V2TIM_GET_CLOUD_NEWER_MSG; // Pull messages later than the group @ message
      afterOption.count = 20;                          // Pull 20 messages
      afterOption.lastMsgSeq = atSequence + 1;         // Start the pull from the first message later than the group @ message, which is not included in the pull list
      afterOption.groupID = #your group id#;           // Pull group messages
      [V2TIMManager.sharedInstance getHistoryMessageList:afterOption succ:^(NSArray<V2TIMMessage *> *msgs) {
          // The group @ message is not included in the returned message list.
          NSLog(@"success");
      } fail:^(int code, NSString *desc) {
          NSLog(@"failure, code:%d, desc:%@", code, desc);
      }];
      template <class T>
      class ValueCallback final : public V2TIMValueCallback<T> {
      public:
          using SuccessCallback = std::function<void(const T&)>;
          using ErrorCallback = std::function<void(int, const V2TIMString&)>;
      
          ValueCallback() = default;
          ~ValueCallback() override = default;
      
          void SetCallback(SuccessCallback success_callback, ErrorCallback error_callback) {
              success_callback_ = std::move(success_callback);
              error_callback_ = std::move(error_callback);
          }
      
          void OnSuccess(const T& value) override {
              if (success_callback_) {
                  success_callback_(value);
              }
          }
          void OnError(int error_code, const V2TIMString& error_message) override {
              if (error_callback_) {
                  error_callback_(error_code, error_message);
              }
          }
      
      private:
          SuccessCallback success_callback_;
          ErrorCallback error_callback_;
      };
      
      // Get the `sequence` of the group @ message
      uint64_t atSequence = 1081;
      
      // Pull the group @ message and earlier messages
      V2TIMMessageListGetOption beforeOption;
      beforeOption.getType = V2TIMMessageGetType::V2TIM_GET_CLOUD_OLDER_MSG;  // Pull messages earlier than the group @ message
      beforeOption.count = 20;                                                // Pull 20 messages
      beforeOption.lastMsgSeq = atSequence;             // Start the pull from the group @ message, which is included in the pull list
      beforeOption.userID = "you group id";  // Pull group messages
      
      auto beforeCallback = new ValueCallback<V2TIMMessageVector>{};
      beforeCallback->SetCallback(
          [=](const V2TIMMessageVector& messageList) mutable {
              // The group @ message is included in the returned message list.
              std::cout << "success" << std::endl;
              delete beforeCallback;
          },
          [=](int error_code, const V2TIMString& error_message) {
              std::cout << "error" << std::endl;
              delete beforeCallback;
          });
      
      V2TIMManager::GetInstance()->GetMessageManager()->GetHistoryMessageList(beforeOption, beforeCallback);
      
      // Pull the group @ message and earlier messages
      V2TIMMessageListGetOption afterOption;
      afterOption.getType = V2TIMMessageGetType::V2TIM_GET_CLOUD_NEWER_MSG;  // Pull messages later than the group @ message
      afterOption.count = 20;                                                 // Pull 20 messages
      afterOption.lastMsgSeq = atSequence + 1;         // Start the pull from the first message later than the group @ message, which is not included in the pull list
      afterOption.userID = "you group id";       // Pull group messages
      
      auto afterCallback = new ValueCallback<V2TIMMessageVector>{};
      afterCallback->SetCallback(
          [=](const V2TIMMessageVector& messageList) mutable {
              // The group @ message is not included in the returned message list.
              std::cout << "success" << std::endl;
              delete afterCallback;
          },
          [=](int error_code, const V2TIMString& error_message) {
              std::cout << "error" << std::endl;
              delete afterCallback;
          });
      
      V2TIMManager::GetInstance()->GetMessageManager()->GetHistoryMessageList(afterOption, afterCallback);

      Message locating for searches

      When a user gets the V2TIMMessage object after the local search and clicks the message, you need to redirect the user to the position of the message and display neighboring messages. At this point, you can set lastMsg to the message object and use the advanced API getHistoryMessageList to pull neighboring messages.
      The following sample code demonstrates the process of pulling the first 20 messages earlier and later than the located message for display.
      Android
      iOS and macOS
      Windows
      // Get the current message object
      V2TIMMessage lastMsg = #The located message#;
      
      // Pull messages earlier than the specified message
      V2TIMMessageListGetOption beforeOption = new V2TIMMessageListGetOption();
      beforeOption.setGetType(V2TIMMessageListGetOption.V2TIM_GET_CLOUD_OLDER_MSG); // Pull messages earlier than the specified message
      beforeOption.setCount(20);                        // Pull 20 messages
      beforeOption.setLastMsg(lastMsg);                 // Start the pull from the specified message, which is not included in the pull list
      beforeOption.setGroupID(#you group id#);          // Pull group messages
      V2TIMManager.getMessageManager().getHistoryMessageList(beforeOption, new V2TIMValueCallback<List<V2TIMMessage>>() {
          @Override
          public void onSuccess(List<V2TIMMessage> v2TIMMessages) {
              // `lastMsg` is not included in the returned message list.
              Log.i("imsdk", "success");
          }
      
          @Override
          public void onError(int code, String desc) {
              Log.i("imsdk", "failure, code:" + code + ", desc:" + desc);
          }
      });
      
      // Pull messages later than the specified message
      V2TIMMessageListGetOption afterOption = new V2TIMMessageListGetOption();
      afterOption.setGetType(V2TIMMessageListGetOption.V2TIM_GET_CLOUD_NEWER_MSG); // Pull messages later than the specified message
      afterOption.setCount(20);                        // Pull 20 messages
      afterOption.setLastMsg(lastMsg);                 // Start the pull from the specified message, which is not included in the pull list
      afterOption.setGroupID(#you group id#);          // Pull group messages
      V2TIMManager.getMessageManager().getHistoryMessageList(afterOption, new V2TIMValueCallback<List<V2TIMMessage>>() {
          @Override
          public void onSuccess(List<V2TIMMessage> v2TIMMessages) {
              // `lastMsg` is not included in the returned message list.
              Log.i("imsdk", "success");
          }
      
          @Override
          public void onError(int code, String desc) {
              Log.i("imsdk", "failure, code:" + code + ", desc:" + desc);
          }
      });
      // Get the current message object
      V2TIMMessage *lastMsg = #The located message#;
      
      // Pull messages earlier than the specified message
      V2TIMMessageListGetOption *beforeOption = [[V2TIMMessageListGetOption alloc] init];
      beforeOption.getType = V2TIM_GET_CLOUD_OLDER_MSG; // Pull messages earlier than the specified message
      beforeOption.count = 20;                          // Pull 20 messages
      beforeOption.lastMsg = lastMsg;                   // Start the pull from the specified message, which is not included in the pull list
      beforeOption.groupID = #your group id#;           // Pull group messages
      [V2TIMManager.sharedInstance getHistoryMessageList:beforeOption succ:^(NSArray<V2TIMMessage *> *msgs) {
          // The specified message is not included in the returned message list.
          NSLog(@"success");
      } fail:^(int code, NSString *desc) {
          NSLog(@"failure, code:%d, desc:%@", code, desc);
      }];
      
      // Pull messages later than the specified message
      V2TIMMessageListGetOption *afterOption = [[V2TIMMessageListGetOption alloc] init];
      afterOption.getType = V2TIM_GET_CLOUD_NEWER_MSG; // Pull messages later than the specified message
      afterOption.count = 20;                          // Pull 20 messages
      afterOption.lastMsg = lastMsg;                   // Start the pull from the specified message, which is not included in the pull list
      afterOption.groupID = #your group id#;           // Pull group messages
      [V2TIMManager.sharedInstance getHistoryMessageList:afterOption succ:^(NSArray<V2TIMMessage *> *msgs) {
          // The specified message is not included in the returned message list.
          NSLog(@"success");
      } fail:^(int code, NSString *desc) {
          NSLog(@"failure, code:%d, desc:%@", code, desc);
      }];
      template <class T>
      class ValueCallback final : public V2TIMValueCallback<T> {
      public:
          using SuccessCallback = std::function<void(const T&)>;
          using ErrorCallback = std::function<void(int, const V2TIMString&)>;
      
          ValueCallback() = default;
          ~ValueCallback() override = default;
      
          void SetCallback(SuccessCallback success_callback, ErrorCallback error_callback) {
              success_callback_ = std::move(success_callback);
              error_callback_ = std::move(error_callback);
          }
      
          void OnSuccess(const T& value) override {
              if (success_callback_) {
                  success_callback_(value);
              }
          }
          void OnError(int error_code, const V2TIMString& error_message) override {
              if (error_callback_) {
                  error_callback_(error_code, error_message);
              }
          }
      
      private:
          SuccessCallback success_callback_;
          ErrorCallback error_callback_;
      };
      
      // Get the current message object
      V2TIMMessage lastMsg = The located message;
      
      // Pull messages earlier than the specified message
      V2TIMMessageListGetOption beforeOption;
      beforeOption.getType = V2TIMMessageGetType::V2TIM_GET_CLOUD_OLDER_MSG;  // Pull messages earlier than the specified message
      beforeOption.count = 20;                                                // Pull 20 messages
      beforeOption.lastMsg = lastMsg;                   // Start the pull from the specified message, which is not included in the pull list
      beforeOption.userID = "you group id";  // Pull group messages
      
      auto beforeCallback = new ValueCallback<V2TIMMessageVector>{};
      beforeCallback->SetCallback(
          [=](const V2TIMMessageVector& messageList) mutable {
              // `lastMsg` is not included in the returned message list.
              std::cout << "success" << std::endl;
              delete beforeCallback;
          },
          [=](int error_code, const V2TIMString& error_message) {
              std::cout << "error" << std::endl;
              delete beforeCallback;
          });
      
      V2TIMManager::GetInstance()->GetMessageManager()->GetHistoryMessageList(beforeOption, beforeCallback);
      
      // Pull messages later than the specified message
      V2TIMMessageListGetOption afterOption;
      afterOption.getType = V2TIMMessageGetType::V2TIM_GET_CLOUD_NEWER_MSG;  // Pull messages later than the specified message
      afterOption.count = 20;                                                 // Pull 20 messages
      afterOption.lastMsg = lastMsg;                   // Start the pull from the specified message, which is not included in the pull list
      afterOption.userID = "you group id";       // Pull group messages
      
      auto afterCallback = new ValueCallback<V2TIMMessageVector>{};
      afterCallback->SetCallback(
          [=](const V2TIMMessageVector& messageList) mutable {
              // `lastMsg` is not included in the returned message list.
              std::cout << "success" << std::endl;
              delete afterCallback;
          },
          [=](int error_code, const V2TIMString& error_message) {
              std::cout << "error" << std::endl;
              delete afterCallback;
          });
      
      V2TIMManager::GetInstance()->GetMessageManager()->GetHistoryMessageList(afterOption, afterCallback);

      Parsing a signaling message

      If you use the SDK's signaling API (Android / iOS and macOS), when you call invite/inviteInGroup and set onlineUserOnly to false (Android) / NO (iOS), a custom message will be generated for each signaling operation (including invite, cancel, accept, reject, and timeout). The message will be delivered to the user in the onRecvNewMessage callback of V2TIMAdvancedMsgListener and can also be pulled from historical messages.
      If you want to customize the display text based on the signaling information, you can use the signaling parsing API getSignalingInfo (Android / iOS and macOS / Windows) to get the signaling information.
      API prototype
      Android
      iOS and macOS
      Windows
      /**
       * Get the signaling information
       *
       * If `onlineUserOnly` is set to `false` in the `invite` operation, a custom message is generated for each signaling operation (including the `invite`, `cancel`, `accept`, `reject`, and `timeout` operations).
       The message will be delivered to users via `V2TIMAdvancedMsgListener` -> `onRecvNewMessage` and can be pulled by users via historical message pulling. If you want to customize the display text based on the signaling information, call the following API to get the signaling information.
       *
       * @param msg // Message object
       * @return V2TIMSignalingInfo //Signaling information. If the value is null, `msg` is not a signaling message.
       */
      public abstract V2TIMSignalingInfo getSignalingInfo(V2TIMMessage msg);
      /**
       * Get the signaling information
       *
       * If `onlineUserOnly` is set to `NO` in the `invite` operation, a custom message will be generated for each signaling operation (including `invite`, `cancel`, `accept`, `reject`, and `timeout`). The message will be delivered to the user via `V2TIMAdvancedMsgListener` > `onRecvNewMessage` and can be pulled from historical messages. To customize the display text based on the signaling information, call the following API to get the signaling information.
       *
       *  @param msg // Message object
       *  @return V2TIMSignalingInfo //Signaling information. If the value is nil, `msg` is not a signaling message.
       */
      - (V2TIMSignalingInfo *)getSignallingInfo:(V2TIMMessage *)msg;
      /**
       * Get the signaling information
       *
       * If `onlineUserOnly` is set to `false` in the `invite` operation,
       * a custom message is generated for each signaling operation (including the `Invite`, `Cancel`, `Accept`, `Reject`, and `Timeout` operations). The message will be delivered to the user via
       * `V2TIMAdvancedMsgListener` -> `onRecvNewMessage`
       * and can be pulled from historical messages. To customize the display text based on the signaling information, call the following API to get the signaling information.
       *
       * @param msg // Message object
       * @return V2TIMSignalingInfo //Signaling information. If `V2TIMSignalingInfo::inviteID` is an empty string, `msg` is not a signaling message.
       */
      virtual V2TIMSignalingInfo GetSignalingInfo(const V2TIMMessage& msg) = 0;
      The following sample code demonstrates the process of pulling historical messages and parsing the display text of the signaling message.
      Android
      iOS and macOS
      Windows
      /// Custom text of the signaling message
      public String getCallSignalingContentWithMessage(V2TIMMessage message) {
          if (message == null) {
              Log.e(TAG, " invalid param ");
              return "";
          }
      
          V2TIMSignalingInfo signalingInfo = V2TIMManager.getSignalingManager().getSignalingInfo(message);
          if (signalingInfo == null) {
              Log.e(TAG, " signalingInfo is null ");
              return "";
          }
      
          String content = "";
          Gson gson = new Gson();
          Object businessIdObj = null;
          String businessId = null;
          try {
              HashMap signalDataMap = gson.fromJson(signalingInfo.getData(), HashMap.class);
              if (signalDataMap != null) {
                  businessIdObj = signalDataMap.get(TUIConstants.Message.CUSTOM_BUSINESS_ID_KEY);
              } else {
                  Log.e(TAG, " signalDataMap is null ");
                  return "";
              }
          } catch (JsonSyntaxException e) {
              Log.e(TAG, " get signalingInfoCustomJsonMap error ");
          }
      
          if (businessIdObj instanceof String) {
              businessId = (String) businessIdObj;
          }
      
          if (TextUtils.equals(businessId, "av_call")) {
              if (signalingInfo.getActionType() == V2TIMSignalingInfo.SIGNALING_ACTION_TYPE_INVITE) {
                  // Make a call
                  content = "@Make a call";
              } else if (signalingInfo.getActionType() == V2TIMSignalingInfo.SIGNALING_ACTION_TYPE_ACCEPT_INVITE) {
                  // Answer the call
                  content = "@Answer the call";
              } else {
                  // Other
                  // ...
              }
          }
      
          return content;
      }
      /// Custom text of the signaling message
      + (NSString *)getCallSignalingContentWithMessage:(V2TIMMessage *)message
      {
          V2TIMSignalingInfo *info = [[V2TIMManager sharedInstance] getSignallingInfo:message];
          if (!info) {
              return nil
          }
          // Parse the `data` field passed through
          NSError *err = nil;
          NSDictionary *param = nil;
          if (info.data != nil) {
              param = [NSJSONSerialization JSONObjectWithData:[info.data dataUsingEncoding:NSUTF8StringEncoding] options:NSJSONReadingMutableContainers error:&err];
          }
          if (!param || ![param isKindOfClass:[NSDictionary class]]) {
              return nil
          }
      
          // Identify the business type
          NSArray *allKeys = param.allKeys;
          if (![allKeys containsObject:@"businessID"]) {
              return nil
          }
          NSString *businessId = [param objectForKey:@"businessID"];
      
          // Determine whether it is an audio/video call signaling
          NSString *content = nil;
          if ([businessId isEqualToString:@"av_call"]) {
              if (info.actionType == SignalingActionType_Invite) {
                  // Make a call
                  content = @"Make a call";
              } else if (info.actionType == SignalingActionType_Accept_Invite) {
                  // Answer the call
                  content = @"Answer the call";
              } else {
                  // Other
                  // ...
              }
          }
          return content;
      }
      Custom text of the signaling message
      std::string GetCallSignalingContentWithMessage(const V2TIMMessage& message) {
         V2TIMSignalingInfo signalingInfo =
             V2TIMManager::GetInstance()->GetSignalingManager()->GetSignalingInfo(message);
         if (signalingInfo.inviteID.Empty()) {
             // If `V2TIMSignalingInfo::inviteID` is empty, `message` is not a signaling message.
             return {};
         }
      
         // Parse the `data` field passed through, using the open source library RapidJSON at https://github.com/Tencent/rapidjson/
         rapidjson::Document document;
         document.Parse(signalingInfo.data.CString(), signalingInfo.data.Size());
         if (!document.HasMember("businessId") || !document["businessId"].IsString()) {
             return {};
         }
         const char* businessId = document["businessId"].GetString();
      
         // Determine whether it is an audio/video call signaling
         std::string content;
         if (businessId == "av_call") {
             if (signalingInfo.actionType == V2TIMSignalingActionType::SignalingActionType_Invite) {
                 // Make a call
                 content = u8"Make a call";
             } else if (signalingInfo.actionType == 2TIMSignalingActionType::SignalingActionType_Accept_Invite) {
                 // Answer the call
                 content = u8"Answer the call";
             } else {
                 // Others
             }
         }
      
         return content;
      }

      FAQs

      What should I do if "total count of request cloud message exceed max limit" is displayed in the log when I am pulling historical messages?
      Currently, the SDK policy is as described below:
      1. When getType is set to pull cloud historical messages and the number of messages to be pulled is set to count, the SDK will pull count messages from the cloud.
      2. The SDK will filter out invalid messages, such as deleted messages and those irrelevant to the current user.
      3. If there are too many invalid historical messages in the cloud, the SDK will perform multiple paged pulls. To ensure the system stability and robustness, the SDK will perform up to three automatic paged pulls. After this limit is exceeded, the "total count of request cloud message exceed max limit" message will be displayed in the log.
      To minimize the impact of such a limit mechanism on the business layer, you can take the following measures to reduce invalid messages:
      You can use online messages, that is, set onlineUserOnly to YES/true when sending messages.
      For group messages, you can use targeted group messages to specify the receiver.
      What should I do if messages are "lost" during cloud historical message pull?
      When getType is set to pull cloud historical messages and the number of messages is count, the SDK will perform the following operations:
      1. Pull count messages from the local database.
      2. Pull count messages from the cloud and filter out invalid messages such as deleted messages. If the number is smaller than count, the paged pull will be triggered.
      3. Merge local and cloud messages and update information such as the message status.
      4. Return count messages from the merged message list.
      Generally speaking, message loss indicates that too many invalid messages are pulled in step 2, which triggers the limit mechanism in question 1 and leads to an insufficient number of messages actually pulled from the cloud. We recommend you fix this issue as instructed in question 1. If the issue persists, contact us for assistance.
      What should I do if group member information such as the group name card is not updated in real time when historical messages are pulled?
      1. When messages are generated, the SDK will update the current group member information such as the group name card and role and store it in the local database.
      2. When historical group messages are pulled, the SDK will directly query the group member information when the messages were generated and will not request updates from the backend in real time.
      If you want to get the latest group member information, you can use the getGroupMembersInfo API (Android / iOS and macOS / Windows).
      What should I do if I get a lag while pulling historical messages?
      The SDK has been optimized for message pull. If a lag occurs, you can reduce the number of pulled messages (count). If the issue persists, contact us for assistance.
      
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