loadMessagesWithKeyword method

Future<List<EMMessage>> loadMessagesWithKeyword(
  1. String keywords,
  2. {String? sender,
  3. int timestamp = -1,
  4. int count = 20,
  5. MessageSearchScope searchScope = MessageSearchScope.All,
  6. EMSearchDirection direction = EMSearchDirection.Up}
)

根据消息中的关键词、消息时间戳、要搜索的消息条数、搜索范围和搜索方向从 SDK 本地数据库中搜索指定数量的消息。

注意：若搜索的消息条数非常大，需要考虑内存消耗。

Param keywords 搜索消息中的关键词。

Param sender 消息发送方的用户 ID。若不设置该参数，SDK 搜索消息时会忽略该参数。

Param timestamp 搜索的起始消息时间戳。

Param count 搜索的消息条数。

Param searchScope 消息搜索范围，详见 MessageSearchScope。

Param direction 消息搜索方向。

Return 消息列表。

Throws 如果有异常会在这里抛出，包含错误码和错误描述，详见 EMError。

Implementation

Future<List<EMMessage>> loadMessagesWithKeyword(
  String keywords, {
  String? sender,
  int timestamp = -1,
  int count = 20,
  MessageSearchScope searchScope = MessageSearchScope.All,
  EMSearchDirection direction = EMSearchDirection.Up,
}) async {
  Map req = Map();
  req["keywords"] = keywords;
  req['count'] = count;
  req['timestamp'] = timestamp;
  req['searchScope'] = MessageSearchScope.values.indexOf(searchScope);
  req['direction'] = direction == EMSearchDirection.Up ? "up" : "down";
  req.putIfNotNull("from", sender);

  Map result =
      await ChatChannel.invokeMethod(ChatMethodKeys.searchChatMsgFromDB, req);
  try {
    EMError.hasErrorFromResult(result);
    List<EMMessage> list = [];
    result[ChatMethodKeys.searchChatMsgFromDB]?.forEach((element) {
      list.add(EMMessage.fromJson(element));
    });
    return list;
  } on EMError catch (e) {
    throw e;
  }
}