downloadOriginalImage method
下载原图 target 聊天对象, JMSingle | JMGroup | JMChatRoom messageId 本地数据库中的消息 id,非 serverMessageId
Implementation
Future<Map> downloadOriginalImage({
required dynamic target,
required String? messageId,
}) async {
Map param = target.toJson();
param['messageId'] = messageId;
Map resJson = await _channel.invokeMethod('downloadOriginalImage',
param..removeWhere((key, value) => value == null));
return {'messageId': resJson['messageId'], 'filePath': resJson['filePath']};
}