/// <summary>
/// 获取指定会话的消息列表
/// </summary>
/// <param name="conv_id">会话的 ID</param>
/// <param name="iMConvType">会话类型，请参考 TIMConvType</param>
/// <param name="msg">消息获取参数</param>
/// <param name="handler">获取指定会话的消息列表成功与否的回调</param>
public static TIMResult IMMsgGetMsgList(string conv_id, TIMConvType iMConvType, MsgGetMsgListParam msg, MsgGetMsgListDelgate handler = null)
{
var ptr = DelegateConverter.ConvertToIntPtr(handler);
return((TIMResult)TIMClientAPIDef.TIMMsgGetMsgList(conv_id, iMConvType, JsonConvert.SerializeObject(msg), MsgGetMsgListResultCallBack, ptr));
}