java - 获取开始菜单的屏幕截图

我正在使用bitblt捕获窗口。如果启用了航空主题，则捕获图像的背景为黑色。如果禁用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);

如何在适当的背景下捕获开始菜单？

还有其他方法可以获取正确的航空窗图像吗？

最佳答案

使用 table 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，我先调用PrintWindow。它充当重新绘制自身的窗口。结果，屏幕截图将具有正确的图像。我通过两次调用PrintWindow得到的最稳定的结果。