/// <summary>
/// 创建群组
/// </summary>
/// <param name="createGroupParam">创建群组的参数</param>
/// <param name="handler">创建群组成功与否的回调</param>
public static TIMResult IMGroupCreate(CreateGroupParam createGroupParam, GroupCreateDelgate handler = null)
{
var ptr = DelegateConverter.ConvertToIntPtr(handler);
return((TIMResult)TIMClientAPIDef.TIMGroupCreate(JsonConvert.SerializeObject(createGroupParam), GroupCreateResultCallBack, ptr));
}