这是微软自带的一个利用cimage进行截图的例子，值得看看

ゝ一纸荒年。 2022-08-27 10:52 200阅读 0赞

struct CaptureData
    {
    BOOL    bCaptureFullScreen;
    char szCapturePath[MAX_PATH]; // no unicode path support
    char szCaptureFilename[MAX_PATH];
    };
    
    void WINAPI CaptureScreen(CaptureData* lpData)
    {
    ASSERT(lpData);
    if (!lpData)
    return;
    
    
    AFX_MANAGE_STATE(AfxGetStaticModuleState());
    
    
    BOOL bStat;
    CImage image;
    CWnd *pWnd;
    CRect rect;
    if (lpData->bCaptureFullScreen) {
    pWnd = CWnd::GetDesktopWindow();
    }
    else {
    pWnd = CWnd::GetActiveWindow();
    }
    ASSERT(pWnd);
    if (pWnd == NULL)
    return;
    
    
    CWindowDC  winDC(pWnd);
    pWnd->GetWindowRect(rect);
    int nBPP = winDC.GetDeviceCaps(BITSPIXEL) * winDC.GetDeviceCaps(PLANES);
    if (nBPP < 24)
    nBPP = 24;
    bStat = image.Create(rect.Width(), rect.Height(), nBPP); //创建图像
    ASSERT(bStat);
    if (!bStat)
    return;
    CImageDC imageDC(image);  
            //将图像绘制到imageDC 中
    ::BitBlt(imageDC, 0, 0, rect.Width(), rect.Height(), winDC, 0, 0, SRCCOPY);
    CString strTempName = GetTempName(CString(lpData->szCapturePath)); //保存为指定格式和路径中
    HRESULT hr = image.Save(strTempName);
    if (FAILED(hr)) {
    TRACE("Couldn't Save File: %s, %x\n", (LPCTSTR)strTempName, hr);
    return;
    }
    strncpy_s(lpData->szCaptureFilename, MAX_PATH, CT2A(::PathFindFileName(strTempName)), _TRUNCATE);
    }
    //获取文件名和路径
    static CString GetTempName(CString strPath)
    {
    const int nMin = 0;
    const int nMax = 999;
    const CString strBase(_T("ScreenCap"));
    static int nLastKnown = nMin;
    
    // count up sequentially to make sure we take the next available
    // slot
    if (strPath.Right(1) != "\\")
    strPath += '\\';
    
    
    bool bFound = false;
    CString strPathName;
    while (!bFound) {
    if (nLastKnown > nMax)
    break;
    strPathName = strPath + strBase;
    strPathName.AppendFormat(_T("%03.3d.png"), nLastKnown++);
    HANDLE hFile = ::CreateFile(strPathName, GENERIC_WRITE, FILE_SHARE_READ, NULL, CREATE_NEW, FILE_ATTRIBUTE_NORMAL, NULL);
    if (hFile != INVALID_HANDLE_VALUE) {
    ::CloseHandle(hFile);
    bFound = TRUE;
    }
    }
    if (!bFound)
    strPathName.Empty();
    return(strPathName);
    }