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7.7

Capture a Window even a window is over

Asked by CSecurity in C++ Programming Language, Microsoft Visual C++.Net, C Programming Language

Hi

I want to capture a window and even another program is over it, I want to capture that window's image.

Here is code I already have.

I get lpRect like this:
HWND hwnd = FindWindow("SciCalc", "Calculator");
GetWindowRect(hwnd , &m_rScreen);

and I pass m_rScreen to capture Calculator's image.

But if I move notepad.exe over calc.exe, I get notepad's image.

Any ideas? Please advice...
Thanks from now

View the Solution FREE for 30 Days

         
           
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             HBITMAP CopyScreenToBitmap(LPRECT lpRect, BYTE *pData, BITMAPINFO *pHeader)
{
    HDC         hScrDC, hMemDC;         // screen DC and memory DC
    HBITMAP     hBitmap, hOldBitmap;    // handles to deice-dependent bitmaps
    int         nX, nY, nX2, nY2;       // coordinates of rectangle to grab
    int         nWidth, nHeight;        // DIB width and height
    int         xScrn, yScrn;           // screen resolution
 
    // check for an empty rectangle
	if (IsRectEmpty(lpRect))       
		return NULL;      
 
	hScrDC = CreateDC("DISPLAY", NULL, NULL, NULL);     
	hMemDC = CreateCompatibleDC(hScrDC);      // get points of rectangle to grab  
 
    // get points of rectangle to grab
    nX  = lpRect->left;
    nY  = lpRect->top;
    nX2 = lpRect->right;
    nY2 = lpRect->bottom;
	
    // get screen resolution
    xScrn = GetDeviceCaps(hScrDC, HORZRES);
    yScrn = GetDeviceCaps(hScrDC, VERTRES);
 
    //make sure bitmap rectangle is visible
    if (nX < 0)
        nX = 0;
    if (nY < 0)
        nY = 0;
    if (nX2 > xScrn)
        nX2 = xScrn;
    if (nY2 > yScrn)
        nY2 = yScrn;
 
	nWidth = nX2 - nX;
	nHeight = nY2 - nY;
 
    // create a bitmap compatible with the screen DC
    hBitmap = CreateCompatibleBitmap(hScrDC, nWidth, nHeight);
 
    // select new bitmap into memory DC
    hOldBitmap = (HBITMAP) SelectObject(hMemDC, hBitmap);
 
    // bitblt screen DC to memory DC
    BitBlt(hMemDC, 0, 0, nWidth, nHeight, hScrDC, nX, nY, SRCCOPY);
 
    // select old bitmap back into memory DC and get handle to
    // bitmap of the screen  
    hBitmap = (HBITMAP)  SelectObject(hMemDC, hOldBitmap);
 
    // Copy the bitmap data into the provided BYTE buffer
    GetDIBits(hScrDC, hBitmap, 0, nHeight, pData, pHeader, DIB_RGB_COLORS);
 
    // clean up
    DeleteDC(hScrDC);
    DeleteDC(hMemDC);
 
    // return handle to the bitmap
    return hBitmap;
}

           
         

20091021-EE-VQP-81 - Hierarchy / EE_QW_3_20080625

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Capture a Window even a window is over

Asked by CSecurity in C++ Programming Language, Microsoft Visual C++.Net, C Programming Language

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