c# - PictureBox.Handle Intptr 到图像或位图

Question

我需要有关 HikVision IPCam 视频流的帮助。我搜索了 2 个洞周，但运气不佳。

我的问题是 IPCamm DLL 使用 PictureBox.Handle 将图像流式传输到图片框中。它工作得很好:

[DllImport("HCNetSDK.dll")]
public static extern int NET_DVR_RealPlay_V30(int lUserID, ref NET_DVR_CLIENTINFO lpClientInfo, RealDataCallBack_V30 fRealDataCallBack_V30, IntPtr pUser, bool bBlocked);

    this.realDataCallBack = new RealDataCallBack_V30(RealDataCallback);
    this.clientInfo.hPlayWnd = PictureBox.Handle;
    this.clientInfo.lChannel = channel;
    this.clientInfo.lLinkMode = 0;

    this.playHandle = NET_DVR_RealPlay_V30(this.userID, ref this.clientInfo, realDataCallBack, IntPtr.Zero, true);

我的问题是我需要处理图像，但我无法将图像捕获为位图或图像，然后按我喜欢的方式显示它。

我尝试了 Bitmap.FromHbitmap(PictureBox.Handle)，尝试了一些 MemoryMarshel 解决方案，但没有成功。

我现在获得它的唯一方法是从质量较低、帧数较低的回调函数中获取数据，...

Answer 1

此代码段将句柄中的数据绘制到位图中，然后设置图片框的图像。在旧系统上可能不需要 CopyFromScreen 行。

PictureBox.Image = CaptureControl(PictureBox.Handle, PictureBox.Width, PictureBox.Height);
// PictureBox.Image now contains the data that was drawn to it

    [DllImport("gdi32.dll")]
    private static extern bool BitBlt(IntPtr hdcDest, int nXDest, int nYDest, int nWidth, int nHeight, IntPtr hdcSrc, int nXSrc, int nYSrc, int dwRop);
    public Bitmap CaptureControl(IntPtr handle, int width, int height)
    {
      Bitmap controlBmp;
      using (Graphics g1 = Graphics.FromHwnd(handle))
      {
        controlBmp = new Bitmap(width, height, g1);
        using (Graphics g2 = Graphics.FromImage(controlBmp))
        {
         g2.CopyFromScreen(this.Location.X + PictureBox.Left, this.Location.Y + PictureBox.Top, 0, 0, PictureBox.Size);

          IntPtr dc1 = g1.GetHdc();
          IntPtr dc2 = g2.GetHdc();

          BitBlt(dc2, 0, 0, width, height, handle, 0, 0, 13369376);
          g1.ReleaseHdc(dc1);
          g2.ReleaseHdc(dc2);
        }
      }

      return controlBmp;
    }