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POHow do I find the position / location of a window given a hWnd without NativeMethods?
 

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  1. POHow do I find the position / location of a window given a hWnd without NativeMethods?
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    <p>I'm currently working with WatiN, and finding it to be a great web browsing automation tool. However, as of the last release, it's screen capturing functionality seems to be lacking. I've come up with a workable solution for capturing screenshots from the screen (independently generating code similar to <a href="https://stackoverflow.com/questions/922546/c-screen-capture-virtual-desktop">this StackOverflow question</a>) in addition to some <a href="http://www.charlespetzold.com/pwcs/ReadingPixelsFromTheScreen.html" rel="nofollow noreferrer">code by Charles Petzold</a>. Unfortunately, there is a missing component: <em>Where is the actual window</em>?</p> <p>WatiN conveniently provides the browser's <code>hWnd</code> to you, so we can (with this simplified example) get set to copy an image from the screen, like so:</p> <pre><code>// browser is either an WatiN.Core.IE or a WatiN.Core.FireFox... IntPtr hWnd = browser.hWnd; string filename = "my_file.bmp"; using (Graphics browser = Graphics.FromHwnd(browser.hWnd) ) using (Bitmap screenshot = new Bitmap((int)browser.VisibleClipBounds.Width, (int)browser.VisibleClipBounds.Height, browser)) using (Graphics screenGraphics = Graphics.FromImage(screenshot)) { int hWndX = 0; // Upper left of graphics? Nope, int hWndY = 0; // this is upper left of the entire desktop! screenGraphics.CopyFromScreen(hWndX, hWndY, 0, 0, new Size((int)browser.VisibileClipBounds.Width, (int)browser.VisibileClipBounds.Height)); screenshot.Save(filename, ImageFormat.Bmp); } </code></pre> <p>Success! We get screenshots, but there's that problem: <code>hWndX</code> and <code>hWndY</code> always point to the upper left most corner of the screen, not the location of the window we want to copy from. </p> <p>I then looked into <code>Control.FromHandle</code>, however this seems to only work with forms you created; this method returns a null pointer if you pass the <code>hWnd</code> into it.</p> <p>Then, further reading lead me to switch my search criteria...I had been searching for 'location of window' when most people really want the 'position' of the window. This lead to <a href="https://stackoverflow.com/questions/1364440/how-to-get-and-set-window-position-of-another-application-in-c">another SO question</a> that talked about this, but their answer was to use native methods.</p> <p>So, <strong>Is there a native C# way of finding the position of a window, only given the hWnd (preferably with only .NET 2.0 era libraries)?</strong></p>
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