BitBlt屏幕截图无法在Windows 10上运行

时间:2017-12-13 20:57:44

标签: c# windows windows-10

我正在使用此代码在后台捕获进程窗口:

IntPtr = Process.GetProcessByName("memu")[0].MainWindowHandle;
RECT rc;
GetClientRect(hwnd, out rc);

IntPtr hdcFrom = GetDC(hwnd);
IntPtr hdcTo = CreateCompatibleDC(hdcFrom);

int Width = rc.right;
int Height = rc.bottom;

Bitmap bmp = null;

IntPtr hBitmap = CreateCompatibleBitmap(hdcFrom, Width, Height);
if (hBitmap != IntPtr.Zero) {
   IntPtr hLocalBitmap = SelectObject(hdcTo, hBitmap);

   BitBlt(hdcTo, 0, 0, Width, Height, hdcFrom, 0, 0, CopyPixelOperation.SourceCopy);
   SelectObject(hdcTo, hLocalBitmap);

   DeleteDC(hdcTo);
   ReleaseDC(hwnd, hdcFrom);

   bmp = Image.FromHbitmap(hBitmap);
   DeleteObject(hBitmap);
   return bmp;
}

此代码捕获一个名为MEmu的Android模拟器,它使用DirectX来呈现内容。但是这个代码在Windows 10更新到版本16299之后停止工作(之前它正常工作),它仍然可以在启用了Aero模式的Windows 7上运行。

当我在Windows 10 Pro v16299.X中使用此方法时,它只返回一个白色图像,或者返回模拟器“加载屏幕”,而不是正在运行的内容。在Windows 7上,如果我删除Aero模式,它将采取相同的行动,捕获“加载屏幕”,因此看起来像新的Windows 10专业版更新中的透明度工作方式改变了。

我已尝试过所有内容,尝试安装一些模块以强制Aero Mode在Windows 10上运行,尝试使用PrintWindow在后台捕获屏幕,但仍然是相同的。

任何想法可能会发生什么?还是可能的解决方案?或者在最后一个可能破坏该代码的Windows 10 Pro版本中发生了哪些变化?

谢谢!

2 个答案:

答案 0 :(得分:1)

希望这可以解决问题。有一种捕获屏幕的方法,该屏幕内置在.net框架中可能有效。不知道它是否可以捕获DirectX内容,但是值得一试。

请注意,此解决方案会捕获当前屏幕,但是您可能可以对其进行修改以仅捕获您感兴趣的区域。

我在这里找到了此解决方案:https://www.c-sharpcorner.com/UploadFile/2d2d83/how-to-capture-a-screen-using-C-Sharp/

private void CaptureMyScreen()
{
      try
      {
           //Creating a new Bitmap object
          Bitmap captureBitmap = new Bitmap(1024, 768, PixelFormat.Format32bppArgb);

         //Bitmap captureBitmap = new Bitmap(int width, int height, PixelFormat);
         //Creating a Rectangle object which will  
         //capture our Current Screen
         Rectangle captureRectangle = Screen.AllScreens[0].Bounds;

         //Creating a New Graphics Object
         Graphics captureGraphics = Graphics.FromImage(captureBitmap);

        //Copying Image from The Screen
        captureGraphics.CopyFromScreen(captureRectangle.Left,captureRectangle.Top,0,0,captureRectangle.Size);

        //Saving the Image File (I am here Saving it in My E drive).
        captureBitmap.Save(@"E:\Capture.jpg",ImageFormat.Jpeg);

        //Displaying the Successfull Result

        MessageBox.Show("Screen Captured");
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

答案 1 :(得分:1)

对我来说,这适用于 Windows 10 11.02.2021:

static void hflipAndSwapRandB(unsigned char* data, int w, int h, int dim)
    {
        int y = 0;
        int x = 0;
        int d;
        unsigned char swap = 0;
        int hh = h / 2;
        for (y = 0; y < hh; y++)
        {
            for (x = 0; x < w; x++)
            {
                for (d = 0; d < dim; d++)
                {
                    swap = data[y * dim * w + dim * x + d];
                    data[y * dim * w + dim * x + d] = data[(h - 1 - y) * dim * w + dim * x + dim - 1 - d];
                    data[(h - 1 - y) * dim * w + dim * x + dim - 1 - d] = swap;
                }
            }
        }
    }

static void copyScreen(unsigned char* pixels_out, int x, int y, int width, int height)
{
    HDC hScreenDC = GetDC(GetDesktopWindow());
    HDC hMemoryDC = CreateCompatibleDC(hScreenDC);

    if (width == -1 || height == -1)
    {
        width = GetDeviceCaps(hScreenDC, HORZRES);
        height = GetDeviceCaps(hScreenDC, VERTRES);
    }

    HBITMAP hBitmap = CreateCompatibleBitmap(hScreenDC, width, height);
    HBITMAP hOldBitmap = (HBITMAP)SelectObject(hMemoryDC, hBitmap);

    BitBlt(hMemoryDC, x, y, width, height, hScreenDC, x, y, SRCCOPY);
    hBitmap = (HBITMAP)SelectObject(hMemoryDC, hOldBitmap);
    BITMAPINFOHEADER   bi;

    bi.biSize = sizeof(BITMAPINFOHEADER);
    bi.biWidth = width-x;
    bi.biHeight = height-y;
    bi.biPlanes = 1;
    bi.biBitCount = 24;
    bi.biCompression = BI_RGB;
    bi.biSizeImage = 0;
    bi.biXPelsPerMeter = 0;
    bi.biYPelsPerMeter = 0;
    bi.biClrUsed = 0;
    bi.biClrImportant = 0;
    GetDIBits(hMemoryDC, hBitmap, 0, height-y, pixels_out, (BITMAPINFO*)&bi, DIB_RGB_COLORS);
    hflipAndSwapRandB(pixels_out, width, height, 3);

    DeleteDC(hMemoryDC);
    DeleteDC(hScreenDC);
    DeleteObject(hBitmap);
}