/// <summary>
/// 群发消息
/// </summary>
/// <param name="msg">群发消息</param>
/// <param name="handler">群发消息成功与否的回调</param>
public static TIMResult IMTIMMsgBatchSend(MsgBatchSendParam msg, MsgBatchSendDelgate handler = null)
{
var ptr = DelegateConverter.ConvertToIntPtr(handler);
return((TIMResult)TIMClientAPIDef.TIMMsgBatchSend(JsonConvert.SerializeObject(msg), MsgBatchSendDelgateResultCallBack, ptr));
}