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    <p>After <strong>MUCH</strong> trial and error, I managed to write a function to do it. here it is for anyone else who might want it:</p> <pre><code>#include "stdafx.h" #include "opencv2/core/core.hpp" #include "opencv2/imgproc/imgproc.hpp" #include &lt;opencv2/highgui/highgui.hpp&gt; #include &lt;Windows.h&gt; #include &lt;iostream&gt; #include &lt;string&gt; using namespace std; using namespace cv; Mat hwnd2mat(HWND hwnd){ HDC hwindowDC,hwindowCompatibleDC; int height,width,srcheight,srcwidth; HBITMAP hbwindow; Mat src; BITMAPINFOHEADER bi; hwindowDC=GetDC(hwnd); hwindowCompatibleDC=CreateCompatibleDC(hwindowDC); SetStretchBltMode(hwindowCompatibleDC,COLORONCOLOR); RECT windowsize; // get the height and width of the screen GetClientRect(hwnd, &amp;windowsize); srcheight = windowsize.bottom; srcwidth = windowsize.right; height = windowsize.bottom/2; //change this to whatever size you want to resize to width = windowsize.right/2; src.create(height,width,CV_8UC4); // create a bitmap hbwindow = CreateCompatibleBitmap( hwindowDC, width, height); bi.biSize = sizeof(BITMAPINFOHEADER); //http://msdn.microsoft.com/en-us/library/windows/window/dd183402%28v=vs.85%29.aspx bi.biWidth = width; bi.biHeight = -height; //this is the line that makes it draw upside down or not 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; // use the previously created device context with the bitmap SelectObject(hwindowCompatibleDC, hbwindow); // copy from the window device context to the bitmap device context StretchBlt( hwindowCompatibleDC, 0,0, width, height, hwindowDC, 0, 0,srcwidth,srcheight, SRCCOPY); //change SRCCOPY to NOTSRCCOPY for wacky colors ! GetDIBits(hwindowCompatibleDC,hbwindow,0,height,src.data,(BITMAPINFO *)&amp;bi,DIB_RGB_COLORS); //copy from hwindowCompatibleDC to hbwindow // avoid memory leak DeleteObject (hbwindow); DeleteDC(hwindowCompatibleDC); ReleaseDC(hwnd, hwindowDC); return src; } </code></pre>
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    1. POHow to capture the desktop in OpenCV (ie. turn a bitmap into a Mat)?
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    1. USjohn ktejik
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    1. COFollowing lines could be added to avoid memory leak: DeleteObject (hbwindow); DeleteDC(hwindowCompatibleDC); ReleaseDC(hwnd, hwindowDC);
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