tencent cloud

[[V2TIMManager sharedInstance] addGroupListener:self];

// Group member notification, group lifecycle notification, group join request notification, topic event listening callback, etc.
- (void)onMemberEnter:(NSString *)groupID memberList:(NSArray<V2TIMGroupMemberInfo *>*)memberList {
    // A member joined the group. All the group members can receive the notification.
}

- (void)onMemberLeave:(NSString *)groupID member:(V2TIMGroupMemberInfo *)member {
    // A member left the group. All the group members can receive the notification.
}

- (void)onReceiveRESTCustomData:(NSString *)groupID data:(NSData *)data {
    // Custom system notification sent by the server
}

class GroupListener final : public V2TIMGroupListener {
public:
    GroupListener() = default;
    ~GroupListener() override = default;

    // Group member notification, group lifecycle notification, group join request notification, topic event listening callback, etc.

    void OnMemberEnter(const V2TIMString& groupID, const V2TIMGroupMemberInfoVector& memberList) override {
        // A member joined the group. All the group members can receive the notification.
    }

    void OnMemberLeave(const V2TIMString& groupID, const V2TIMGroupMemberInfo& member) override {
        // A member left the group. All the group members can receive the notification.
    }

    void OnReceiveRESTCustomData(const V2TIMString& groupID, const V2TIMBuffer& customData) override {
        // Custom system notification sent by the server
    }
};

// Add a group event listener. Keep `groupListener` valid before the listener is removed to ensure event callbacks are received.
GroupListener groupListener;
V2TIMManager::GetInstance()->AddGroupListener(&groupListener);

V2TIMGroupSearchParam *searchParam = [[V2TIMGroupSearchParam alloc] init];
searchParam.keywordList = @[@"keyword1", @"keyword2", @"keyword3"];
searchParam.isSearchGroupID = true;
searchParam.isSearchGroupName = true;
// Search group information
[[V2TIMManager sharedInstance] searchGroups:searchParam succ:^(NSArray<V2TIMGroupInfo *> *groupList) {
  // Search group information successful
} fail:^(int code, NSString *desc) {
  // Search group information failed
}];

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_;
};

V2TIMGroupSearchParam searchParam;
searchParam.keywordList = keywordList;
searchParam.isSearchGroupID = true;
searchParam.isSearchGroupName = true;

auto callback = new ValueCallback<V2TIMGroupInfoVector>{};
callback->SetCallback(
    [=](const V2TIMGroupInfoVector& groupInfoList) {
        // Search group succeeded
        delete callback;
    },
    [=](int error_code, const V2TIMString& error_message) {
        // Search group failed
        delete callback;
    });

V2TIMManager::GetInstance()->GetGroupManager()->SearchGroups(searchParam, callback);