private static void Checker_OnDiffentMaked(object sender, BitmapMarker marker)
        {
            DateTime enterTime = DateTime.Now;

            while (BitmapQueue.Count > 0)
            {
                if ((DateTime.Now - enterTime).TotalSeconds > 2)
                {
                    //客户端下载图片超时,输出整张图片
                    marker.Id = BitmapQueueIndex++;
                    marker.Bitmap.Dispose();
                    marker.Rect   = new RECT(new System.Drawing.Rectangle(Point.Empty, ((WindowBitmap)sender).CurrentBitmap.Size));
                    marker.Bitmap = (Bitmap)((WindowBitmap)sender).CurrentBitmap.Clone();

                    lock (BitmapQueue)
                    {
                        for (int i = 0; i < BitmapQueue.Count; i++)
                        {
                            BitmapQueue[i].Bitmap.Dispose();
                        }
                        BitmapQueue.Clear();
                        BitmapQueue.Add(marker);
                    }
                    SendGroupMessage("group1", Newtonsoft.Json.JsonConvert.SerializeObject(marker));
                    return;
                }
                System.Threading.Thread.Sleep(0);
            }
            lock (BitmapQueue)
            {
                marker.Id = BitmapQueueIndex++;
                BitmapQueue.Add(marker);
            }
            SendGroupMessage("group1", Newtonsoft.Json.JsonConvert.SerializeObject(marker));
        }
        internal static Bitmap GetBitmapById(int id)
        {
            BitmapMarker item = null;

            lock (BitmapQueue)
            {
                for (int i = 0; i < BitmapQueue.Count; i++)
                {
                    if (BitmapQueue[i].Id == id)
                    {
                        item = BitmapQueue[i];
                        BitmapQueue.RemoveAt(i);
                        break;
                    }
                }
            }
            if (item == null)
            {
                return(null);
            }
            return(item.Bitmap);
        }