MFC C ++截图

Question

我有一个使用CDC绘制网格的应用程序（它具有文本，矩形和位图）。 我要保存该完成的网格的屏幕截图，并将该屏幕截图用作文件的“预览”。

如何拍摄应用程序的屏幕截图并保存？

谢谢，

Answer 1

答案在这里

void CScreenShotDlg::OnPaint()
{
    // device context for painting
    CPaintDC dc(this);

    // Get the window handle of calculator application.
    HWND hWnd = ::FindWindow( 0, _T( "Calculator" ));

    // Take screenshot.
    PrintWindow( hWnd,
                 dc.GetSafeHdc(),
                 0 );
}

Answer 2

最终，我最终这样做了，因为我想甚至捕获窗口的隐藏部分（因为内容超出了屏幕，需要滚动）：

CDC* WindowToCaptureDC = AfxGetMainWnd()->GetWindowDC();
CDC CaptureDC;
CDC MemDC;
MemDC.CreateCompatibleDC(WindowToCaptureDC);
CaptureDC.CreateCompatibleDC(WindowToCaptureDC);

CBitmap CaptureBmp;
CBitmap ResizeBmp;
int pWidth = grid.tableWidth + grid.marginLeft*2;
int pHeight = grid.tableHeight + grid.marginBottom; 

CaptureBmp.CreateCompatibleBitmap( WindowToCaptureDC, pWidth, pHeight);
CaptureDC.SelectObject(&CaptureBmp);

CBrush brush(RGB(255, 255, 255));
CaptureDC.SelectObject(&brush);
CaptureDC.Rectangle(0, 0, pWidth, pHeight);

///像在OnDraw HERE一样将项目拖入CaptureDC ///

double width = //desired width;
double height = //desired width;

    //maintain aspect ratio
if(pWidth!=width || pHeight!=height)
{
    double w = width/pWidth;
    double h = height/pHeight;
    if(w < h)
        height = height*w;
    else
        width = width*h;
}

ResizeBmp.CreateCompatibleBitmap(WindowToCaptureDC, width, height);
MemDC.SelectObject(&ResizeBmp);

MemDC.StretchBlt(0, 0, width, height, &CaptureDC, 0, 0, pWidth, pHeight, SRCCOPY);

CImage TempImageObj;
TempImageObj.Attach((HBITMAP)ResizeBmp.Detach());
CString filePath = _T("LOCATION\\image.bmp");
TempImageObj.Save(filePath);