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Get message history


Function overview

Note

This document applies to the following platforms: iOS, Android, macOS, Windows and Web.

This document describes how to query the message history and specific messages of one-to-one, group, and in-room chats with the ZIM SDK.

Note

This feature allows you to get historical messages of types other than command messages and pop-up messages.

Get the full message history

After logging in to ZIM SDK, users can use the queryHistoryMessage method to retrieve the message history of one-to-one chats, group chats, and rooms chats by providing the parameters conversationID and config.

Taking the example of client A retrieving the conversation history with client B in a one-on-one chat:

  1. Client A and B log in to the ZIM SDK and send/receive one-on-one chat messages to each other.
  2. When client A needs to retrieve the conversation records with B:
    1. Client A first logs in to the ZIM SDK.
    2. Client A calls the queryHistoryMessage interface and passes the conversationID and config parameters to start retrieving.
    3. The retrieved results will be notified to client A through the ZIMMessageQueriedResult callback interface.
Sample code
// Get the historical messages of a one-on-one chat
// Get the conversation history messages from the back to the front, retrieve 30 messages each time
  ZIMMessageQueryConfig config = ZIMMessageQueryConfig();
// For the first retrieval, nextMessage is null
  config.nextMessage = null;
  config.count = 30;
  config.reverse = true;
  await ZIM
      .getInstance()!
      .queryHistoryMessage('conversationID', ZIMConversationType.peer, config)
      .then((value) => {
            // Triggered when successful
            // Developers can listen to this callback to obtain the retrieved message list.
            // When the finger scrolls down to the topmost message on the screen, retrieve earlier messages
            // Save the frontmost message as the anchor for the messages
            if (fetchMore) {
              // For subsequent pagination retrieval, nextMessage is the first message in the currently retrieved message list
              config.nextMessage = value.messageList[0],
              // Recursive retrieval
            }
          })
      .catchError((onError) {
    // Triggered when failed
  });
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Get specific messages

ZIM supports querying specific messages in a one-to-one or group conversation based on messageSeq (the sequence number of the message in the conversation) list (up to a maximum of 10) by calling queryMessages.

This interface is used when you only know the messageSeq of a message and do not know the complete structure of the message. For example, if a message in a conversation replies to a historical message, members of the conversation can use the repliedInfo.messageSeq of the reply to obtain the messageSeq of the historical message. At this time, you can call this interface to obtain the complete structure of the historical message.

Untitled
List<int> messageSeqs = []; // The maximum length is 10
String conversationID = "YOUR_CONVERSATION_ID";
ZIMConversationType conversationType = ZIMConversationType.peer; // Conversation type: one-to-one: ZIMConversationTypePeer, group: ZIMConversationTypeGroup

ZIM.getInstance()?.queryMessages(messageSeqs, conversationID, conversationType).then((value) {
    // Query successful
}).catchError((onError){
    if(onError is PlatformException){
        // Query failed
    }
});
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