VC++ 截屏代码，并保存为想要的格式（BMP,JPG,PNG,GIF等格式）

void CCaptionScreenDlg::Screen(char* filename)

{

    HDC hdcSrc = ::GetDC(NULL);

    int nBitPerPixel = GetDeviceCaps(hdcSrc, BITSPIXEL);

    int nWidth = GetDeviceCaps(hdcSrc, HORZRES);

    int nHeight = GetDeviceCaps(hdcSrc, VERTRES);

    CImage image;

    image.Create(nWidth, nHeight, nBitPerPixel);

    BitBlt(image.GetDC(), , , nWidth, nHeight, hdcSrc, , , SRCCOPY);

    ::ReleaseDC(NULL, hdcSrc);

    image.ReleaseDC();

    image.Save((LPCTSTR)filename, Gdiplus::ImageFormatPNG);//ImageFormatJPEG

}