Question

我正在制作一个C ++程序，它截取整个屏幕的截图。我面临着一个很大的问题。当我运行程序时，它只截取控制台屏幕的屏幕截图，而不是整个桌面。

 HDC Screen = CreateDC(L"DISPLAY", NULL, NULL, NULL);
    HDC Capture = CreateCompatibleDC(Screen);
    int width = GetDeviceCaps(Screen, HORZRES);
    int height = GetDeviceCaps(Screen, VERTRES);
    LPBYTE lpcapture;
    BITMAPINFO bmiCapture = 
    { {        sizeof(BITMAPINFOHEADER),width,height,1,24,BI_RGB,0,0,0,0,0 } };
    HBITMAP hbmCapture = CreateDIBSection(Screen, &bmiCapture, DIB_RGB_COLORS, (LPVOID *)&lpcapture, NULL, 0);
    if (hbmCapture)
    {
        HBITMAP hbmOld = (HBITMAP) SelectObject(Capture, Capture);
        BitBlt(Capture, 0, 0, width, height, Screen, 0, 0, SRCCOPY);
        SelectObject(Capture, hbmOld);
    }
    DeleteDC(Capture);
    DeleteDC(Screen);
    return hbmCapture;

Answer 1

这应该在控制台程序中工作，但它会在中间显示黑色控制台屏幕

int ScreenCapture(const char* fname)
{
    int result = 0; 
    HWND hWnd = GetDesktopWindow();
    HBITMAP hbmScreen = NULL;
    HDC hdcScreen = GetDC(NULL);
    HDC hdcWindow = GetDC(hWnd);
    int w = GetSystemMetrics(SM_CXSCREEN);
    int h = GetSystemMetrics(SM_CYSCREEN);

    HDC hdcMemDC = CreateCompatibleDC(hdcWindow);
    if (!hdcMemDC) goto cleanup;

    hbmScreen = CreateCompatibleBitmap(hdcWindow, w, h);
    if (!hbmScreen) goto cleanup;

    SelectObject(hdcMemDC, hbmScreen);
    if (!BitBlt(hdcMemDC, 0, 0, w, h, hdcWindow, 0, 0, SRCCOPY)) goto cleanup;

    BITMAPFILEHEADER   bmfHeader;
    BITMAPINFOHEADER   bi;

    bi.biSize = sizeof(BITMAPINFOHEADER);
    bi.biWidth = w;
    bi.biHeight = h;
    bi.biPlanes = 1;
    bi.biBitCount = 32;
    bi.biCompression = BI_RGB;
    bi.biSizeImage = 0;
    bi.biXPelsPerMeter = 0;
    bi.biYPelsPerMeter = 0;
    bi.biClrUsed = 0;
    bi.biClrImportant = 0;

    DWORD dwBmpSize = ((w * bi.biBitCount + 31) / 32) * 4 * h;

    HANDLE hDIB = GlobalAlloc(GHND, dwBmpSize);
    char* lpbitmap = (char*)GlobalLock(hDIB);

    GetDIBits(hdcWindow, hbmScreen, 0, h, lpbitmap, (BITMAPINFO*)&bi, DIB_RGB_COLORS);

    bmfHeader.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER) + (DWORD)sizeof(BITMAPINFOHEADER);
    bmfHeader.bfSize = dwBmpSize + sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
    bmfHeader.bfType = 0x4D42; //'BM' for Bitmaps

    DWORD temp = 0;
    HANDLE hFile = CreateFileA(fname, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
    WriteFile(hFile, (LPSTR)&bmfHeader, sizeof(BITMAPFILEHEADER), &temp, NULL);
    WriteFile(hFile, (LPSTR)&bi, sizeof(BITMAPINFOHEADER), &temp, NULL);
    WriteFile(hFile, (LPSTR)lpbitmap, dwBmpSize, &temp, NULL);
    CloseHandle(hFile); 

    GlobalUnlock(hDIB); 
    GlobalFree(hDIB);

    result = 1; //success

cleanup:
    DeleteObject(hbmScreen);
    DeleteObject(hdcMemDC);
    ReleaseDC(NULL, hdcScreen);
    ReleaseDC(hWnd, hdcWindow);

    return result;
}

在WIndows 8.1中捕获整个ScreenShot的PC

1 个答案: