获取当前屏幕图像并保存为bmp文件

最新推荐文章于 2023-08-06 16:24:16 发布

zwmei

最新推荐文章于 2023-08-06 16:24:16 发布

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分类专栏： VC 文章标签： colors delete byte file

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此函数创建了1080p高清图片，即分辨率为：1920 x 1080

如果想创建不同的分辨率图片，可以修改函数中的 nWidth 和 nHeight.

此文仅供参考，如有不妥之处，请多多指教。

void Create1080p()

{
    int nWidth = 1920;
    int nHeight = 1080;
    int size = nWidth*nHeight;
    HDC hdc = ::GetDC(GetDesktopWindow());//获取屏幕DC
    HDC hdcmem = ::CreateCompatibleDC(hdc);//创建兼容dC
    HBITMAP hbitmap = ::CreateCompatibleBitmap(hdc, nWidth, nHeight);
    HBITMAP holdmap = (HBITMAP)::SelectObject(hdcmem, hbitmap);
    ::BitBlt(hdcmem, 0, 0, nWidth, nHeight, hdc, 0, 0, SRCCOPY);

    BITMAPINFO* bMapInfo = (BITMAPINFO*)::LocalAlloc(LPTR, sizeof(BITMAPINFO));
    bMapInfo->bmiHeader.biBitCount = 24;
    bMapInfo->bmiHeader.biClrImportant = 0;
    bMapInfo->bmiHeader.biCompression = 0;
    bMapInfo->bmiHeader.biHeight = nHeight;
    bMapInfo->bmiHeader.biPlanes = 1;
    bMapInfo->bmiHeader.biSize = sizeof(BITMAPINFO);
    bMapInfo->bmiHeader.biSizeImage = size*3;
    bMapInfo->bmiHeader.biWidth = nWidth;
    bMapInfo->bmiHeader.biXPelsPerMeter = 0;
    bMapInfo->bmiHeader.biYPelsPerMeter = 0;

    BITMAPFILEHEADER bmfh;
    bmfh.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
    bmfh.bfReserved1 = 0;
    bmfh.bfReserved2 = 0;
    bmfh.bfSize = sizeof(BITMAPFILEHEADER);
    bmfh.bfType = 0x4D42;

    RGBTRIPLE *rgb = new RGBTRIPLE[size];
    ZeroMemory(rgb, sizeof(byte)*size*3);
    ::GetDIBits(hdc, hbitmap, 0, nHeight, rgb, bMapInfo, DIB_RGB_COLORS);

    CString bmpfile = _T("..\\top.bmp");
    CFile file(bmpfile, CFile::modeCreate|CFile::modeWrite);
    file.Write(&bmfh, sizeof(BITMAPFILEHEADER));
    file.Write(&bMapInfo->bmiHeader, sizeof(BITMAPINFOHEADER));
    file.Write(rgb, bMapInfo->bmiHeader.biSizeImage);
    file.Close();

    ::LocalFree(bMapInfo);
    delete rgb;
    ::SelectObject(hdcmem, holdmap);
    ::DeleteObject(hbitmap);
    ::DeleteDC(hdcmem);
    ::DeleteObject(hdc);
}