downloadMergerMessage method

Implementation

Future<V2TimValueCallback<List<V2TimMessage>>> downloadMergerMessage({
  required String msgID
}) async {
  if (!TIMManager.instance.isInitSDK()) {
    return V2TimValueCallback<List<V2TimMessage>>(code: TIMErrCode.ERR_SDK_NOT_INITIALIZED.value, desc: "sdk not init");
  }

  V2TimValueCallback<List<V2TimMessage>> findResult = await findMessages(messageIDList: [msgID]);
  if (findResult.code != TIMErrCode.ERR_SUCC.value) {
    return V2TimValueCallback(code: findResult.code, desc: findResult.desc);
  }

  List<V2TimMessage> msgList = findResult.data!;
  if (msgList.isEmpty) {
    return V2TimValueCallback(code: TIMErrCode.ERR_INVALID_PARAMETERS.value, desc: 'message not found');
  }

  String userData = Tools.generateUserData('downloadMergerMessage');
  Completer<V2TimValueCallback<List<V2TimMessage>>> completer = Completer();
  void handleApiCallback(Map jsonResult) {
    V2TimValueCallback<List<V2TimMessage>> callbackResult = V2TimValueCallback<List<V2TimMessage>>.fromJson(jsonResult);
    if (callbackResult.code == 0 && callbackResult.data != null && callbackResult.data!.isNotEmpty) {
      _mergerMessageMap.addAll({ for (var message in callbackResult.data!) message.msgID!: message });
    }

    completer.complete(callbackResult);
  }
  NativeLibraryManager.timApiValueCallback2Future(userData, handleApiCallback);

  Pointer<Char> pMessage = Tools.string2PointerChar(json.encode(msgList[0].toJson()));
  Pointer<Void> pUserData = Tools.string2PointerVoid(userData);
  NativeLibraryManager.bindings.DartDownloadMergerMessage(pMessage, pUserData);

  return completer.future;
}