抓取桌面内容并显示

抓取桌面，并在10，10坐标显示

 

void DisSrceen()
{
    int x = 10, y = 10;
    int BitWidth = GetSystemMetrics(SM_CXSCREEN);
    int BitHeight = GetSystemMetrics(SM_CYSCREEN);    
    
    //Define Variable
    HDC hdcmy,hbufferdc;
    HBITMAP hBit,hOldBitmap;
    
    //Create DesktopDC
    hdcmy = CreateDC("DISPLAY",NULL,NULL,NULL);
    hbufferdc = CreateCompatibleDC(hdcmy);
    
    //Create Hbitmap
    hBit = CreateCompatibleBitmap(hdcmy, BitWidth, BitHeight);
    
    //Get bit to Buffer
    hOldBitmap = (HBITMAP)SelectObject(hbufferdc, hBit);
    StretchBlt(hbufferdc, 0, 0, BitWidth, BitHeight, hdcmy, 0, 0, BitWidth, BitHeight, SRCCOPY);
    
    //Get finally bit
    hBit = (HBITMAP)SelectObject(hbufferdc, hOldBitmap);
    
    //Release Memory
    DeleteObject(hOldBitmap);
    ReleaseDC(NULL,hdcmy);
    ReleaseDC(NULL,hbufferdc);
        
    HBITMAP hbitmap = hBit;
    
    //get desktop dc
    CDC *dc = CDC::FromHandle(::GetWindowDC(::GetDesktopWindow()));
    CDC dcMemory;
    dcMemory.CreateCompatibleDC(dc);
    
    CBitmap *bitmap = new CBitmap();
    
    if(hbitmap)
    {
        bitmap->Attach(hbitmap);
    }
    else
    {
        AfxMessageBox("ERROR: hbitmap is NULL.");
        goto END;        
    }
    
    long bmWidth,bmHeight;
    BITMAP bm;
    bitmap->GetBitmap(&bm);
    bmWidth=bm.bmWidth;
    bmHeight=bm.bmHeight;
    dcMemory.SelectObject(bitmap);
    dc->BitBlt( 100, 100, bmWidth, bmHeight, &dcMemory, 0, 0, SRCCOPY);
    
END:
    dc->Detach();
    dcMemory.Detach();
    bitmap->Detach();
}