获取startmenu的截图
我正在使用bitblt来捕获一个窗口。 如果启用了航空主题,则捕获图像的背景为黑色。 如果我禁用DWM并捕获窗口,则捕获的图像非常好。
这是我的代码的一部分。
HDC hdcMemDC = GDI32.INSTANCE.CreateCompatibleDC(desktopDC);
HDC windowDC = User32.INSTANCE.GetDC(window);
HWND window= User32Extra.INSTANCE.FindWindow(null, "Start menu");
GDI32Extra.INSTANCE.BitBlt(hdcMemDC, 0, 0, width, height, desktopDC, 0, 0, WinGDIExtra.SRCCOPY );
GDI32Extra.INSTANCE.BitBlt(hdcMemDC,windowBounds.left, windowBounds.top, windowWidth, windowHeight, windowDC, windowBounds.left+windowBounds1.right-windowBounds.right+(windowExtraGap/2), windowBounds.top+windowBounds1.bottom-windowBounds.bottom+(windowExtraGap/2), WinGDIExtra.SRCCOPY);
如何捕捉具有适当背景的开始菜单?
有没有其他方法可以获得正确的航空窗口图像?
使用桌面DC并切换到窗口
RECT rc, rc2;
GetClientRect(hWnd, &rc);
GetWindowRect(hWnd, &rc2);
int width = rc2.right - rc2.left;
int height = rc2.bottom - rc2.top;
HDC hdcScreen = GetDC(NULL); //!!!! Get desktop DC
HDC hBmpFileDC = CreateCompatibleDC(hdcScreen);
HBITMAP hBmpFileBitmap = CreateCompatibleBitmap(hdcScreen, width, height);
HBITMAP hOldBitmap = (HBITMAP)SelectObject(hBmpFileDC, hBmpFileBitmap);
BitBlt(hBmpFileDC, 0, 0, width, height, hdcScreen, rc2.left, rc2.top, SRCCOPY | CAPTUREBLT);
HGDIOBJ prev = SelectObject(hBmpFileDC, hOldBitmap);
SaveBitmap(szLogFilename, hBmpFileBitmap);
DeleteDC(hBmpFileDC);
DeleteObject(hBmpFileBitmap);
另一种变体
RECT rc;
GetClientRect(hWnd, &rc);
int width = rc.right - rc.left;
int height = rc.bottom - rc.top;
HDC hdcScreen = GetDC(hWnd);
////////////////////////////
PrintWindow(hWnd, hdcScreen, 0);
PrintWindow(hWnd, hdcScreen, PW_CLIENTONLY);
////////////////////////////
HDC hBmpFileDC = CreateCompatibleDC(hdcScreen);
HBITMAP hBmpFileBitmap = CreateCompatibleBitmap(hdcScreen, width, height);
HBITMAP hOldBitmap = (HBITMAP)SelectObject(hBmpFileDC, hBmpFileBitmap);
BitBlt(hBmpFileDC, 0, 0, width, height, hdcScreen, 0, 0, SRCCOPY | CAPTUREBLT);
HGDIOBJ prev = SelectObject(hBmpFileDC, hOldBitmap);
SaveBitmap(szLogFilename, hBmpFileBitmap);
DeleteDC(hBmpFileDC);
DeleteObject(hBmpFileBitmap);
在调用任何捕获方法之前,我调用PrintWindow。 它会自动重新绘制窗口。 结果屏幕捕捉将会有正确的图像。 双击PrintWindow时获得的最稳定的结果。
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