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Last updated: 2024-08-01 16:05:45

    Message Class

    In the Chat SDK, the message class is V2TIMMessage (Android / iOS and macOS / Windows), which will be frequently used for message sending and receiving.
    The V2TIMMessage class defines the following content:
    Attribute
    Definition
    Description
    msgID
    Message ID
    It is empty when a message is created and is returned synchronously when sendMessage is called.
    timestamp
    Message timestamp
    The time a message is sent to the server, which can be used for message sorting
    sender
    userID of the message sender
    It can be set by users and must be the same as the userID passed in during login.
    nickName
    Nickname of the message sender
    It can be set by users and modified by calling setSelfInfo. For more information, see User Profile.
    friendRemark
    Friend remark of the message sender
    It is used by the receiver. For example, if Alice sets Bob's remarks to bob01, when Bob sends a message to Alice, Alice will see that friendRemark in the message is bob01. It can be set by calling setFriendInfo. For more information, see Group Member Profile.
    nameCard
    Group name card of the sender
    It applies only to group messages. For example, if Alice changes her group name card to doctorA and sends a message to the group, other group members will receive the message where the nameCard field is doctorA. The receiver can prioritize this field as the username for display. nameCard can be set by calling setGroupMemberInfo.
    faceURL
    Profile photo of the message sender
    It can be set by users and can be used to download the photo.
    groupID
    Group ID
    groupID is the group ID in a group message or nil in a one-to-one message.
    userID
    User ID
    userID is the ID of the receiver in a one-to-one message or nil in a group message.
    seq
    Message serial number
    The seq values of one-to-one messages are locally generated and may not be in ascending order and unique; the seq values of group messages are generated by the server and are in ascending order and unique in the group.
    random
    Random message code
    It is generated in the SDK.
    status
    Message sending status
    Currently, the following statuses are supported: sending, sent successfully, failed to send, deleted, imported locally, and recalled.
    isSelf
    Whether the message is sent by oneself
    It can be used to filter messages.
    needReadReceipt
    Whether the message requires a read receipt
    It is set by the sender and valid for the Premium edition on v6.1 or later. For more information, see Read Receipt.
    priority
    Message priority
    It applies only to group messages and can be set by calling the sendMessage API.
    groupAtUserList
    List of users mentioned in the group message
    It applies only to group messages and stores the userID. For more information, see Group @ Message.
    elemType
    Message type
    Currently, the following message types are supported: text, custom, image, audio, video, file, geographical location, emoji, group tip, and merged messages. For more information, see Message Types.
    textElem
    Text message storage element
    It needs to be created and filled content when a text message is sent. When the message is received and elemType is identified as TEXT, the content can be parsed from textElem. For more information, see Sending Message / Receiving Message.
    customElem
    Custom message storage element
    It needs to be created and filled content when a custom message is sent. When the message is received and elemType is identified as CUSTOM, the content can be parsed from customElem.
    imageElem
    Image message storage element
    It needs to be created and filled content when an image message is sent. When the message is received and elemType is identified as IMAGE, the content can be parsed from imageElem.
    soundElem
    Audio message storage element
    It needs to be created and filled content when an audio message is sent. When the message is received and elemType is identified as SOUND, the content can be parsed from soundElem.
    videoElem
    Video message storage element
    It needs to be created and filled content when a video message is sent. When the message is received and elemType is identified as VIDEO, the content can be parsed from videoElem.
    fileElem
    File message storage element
    It needs to be created and filled content when a file message is sent. When the message is received and elemType is identified as FILE, the content can be parsed from fileElem.
    locationElem
    Geographical location message storage element
    It needs to be created and filled content when a geographical location message is sent. When the message is received and elemType is identified as LOCATION, the content can be parsed from locationElem.
    faceElem
    Emoji message storage element
    It needs to be created and filled content when an emoji message is sent. When the message is received and elemType is identified as FACE, the content can be parsed from faceElem.
    mergerElem
    Merged message storage element
    It needs to be created and filled content when a merged message is sent. When the message is received and elemType is identified as MERGER, the content can be parsed from mergerElem. For more information, see Forwarding Message.
    groupTipsElem
    Group tip message storage element
    Currently, a group tip message can be sent only by the server. When the message is received by the SDK and elemType is identified as GROUP_TIPS, the content can be parsed from groupTipsElem.
    cloudCustomData
    Custom message data
    It is set by the sender and can be customized. It is saved in the cloud, will be sent to the receiver, and can still be pulled after the application is uninstalled and reinstalled.
    isExcludedFromUnreadCount
    Whether the message is excluded from the unread message count of the conversation
    It is set by the sender. By default, messages are included in the unread message count. This field is supported by v5.3.425 or later.
    isExcludedFromLastMessage
    Whether the message is excluded from the lastMsg of the conversation
    It is set by the sender. By default, messages are included in the lastMsg of the conversation. This field is supported by v5.4.666 or later. For more information, see Conversation List.
    isExcludedFromContentModeration
    Whether the message is excluded from content moderation(cloud moderation)
    It is set by the sender. By default, messages are included in the content moderation. This field is supported by v7.1 or later. Only when cloud moderation feature is enabled, the settings will be effective.
    hasRiskContent
    Whether the message is identified as risk message
    Only messages containing sound and video are supported. It will take effect after you enabling the cloud moderation feature. If you send a risky sound or video message, you will receive the onRecvMessageModified callback with this field being set to true after the cloud moderation. This field is supported by v7.4 or later.
    disableCloudMessagePreHook
    Whether to disable the cloud message hook before sending
    It is set by the sender. By default, enable the cloud message hook before sending. This field is supported by v8.1 or later.
    disableCloudMessagePostHook
    Whether to disable the cloud message hook after sending
    It is set by the sender. By default, enable the cloud message hook after sending. This field is supported by v8.1 or later.
    isRead
    Whether the message is read at the local end
    A message is read by default if it is sent by oneself.
    isPeerRead
    Whether the message is read by the receiver
    It applies only to one-to-one messages.
    localCustomData
    Custom message data
    It is set by the sender. It is saved locally, will not be sent to the receiver, and will become invalid after the application is uninstalled and reinstalled.
    localCustomInt
    Custom message data
    It is set by the sender. It is saved locally, will not be sent to the receiver, and will become invalid after the application is uninstalled and reinstalled. It can be used to mark whether an audio or video message has been played back.

    Message Types

    Messages can be classified by message destination into two types: one-to-one messages (also called C2C messages) and group messages.
    Message Type
    API Keyword
    Description
    One-to-one message
    C2CMessage
    It is also called the C2C message. When sending a one-to-one message, you must specify the UserID of the receiver, and only the receiver can receive this message.
    Group message
    GroupMessage
    When sending a group message, you must specify the groupID of the target group, and all users in the group can receive this message.
    IM messages can also be classified by content into text messages, custom (signaling) messages, image messages, video messages, audio messages, file messages, location messages, and merged messages.
    Message Type
    API Keyword
    Description
    Text message
    TextElem
    Ordinary text message
    Custom message
    CustomElem
    It is a section of binary buffer and often used to transfer custom signaling in your application.
    Image message
    ImageElem
    When the SDK sends an original image, it automatically generates two images in different sizes. The three images are called the original image, large image, and thumbnail.
    Video message
    VideoElem
    A video message contains a video file and a thumbnail.
    Audio message
    SoundElem
    It supports displaying a red dot before the playback of the audio message.
    File message
    FileElem
    A file message cannot exceed 100 MB.
    Location message
    LocationElem
    A location message contains three fields: location description, longitude, and latitude.
    Merged message
    MergerElem
    It is suitable for merging and forwarding chat history. Up to 300 messages can be merged.

    Message Storage Strategy

    IM messages can be classified by message storage strategy into two types: online messages and non-online messages. Online messages can be received only by online users and will not be pushed when they are offline. Non-online messages can be received by users whether they are online or not.
    Online messages are delivered in real time and not stored on the server or in the SDK. Therefore, they cannot be pulled from historical messages after the device is changed or the application is uninstalled and reinstalled.
    Note
    1. All messages in an audio-video group are online messages.
    2. Messages pushed to all users are online messages.
    Non-online messages are stored in the SDK and on the server. By default, they are stored on the roaming server for seven days. If you want a longer storage period, you need to purchase the value-added service. For more information on the service content and billing, see Pricing.
    These messages can be pulled from historical messages after the device is changed or the application is uninstalled and reinstalled.
    
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