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POCapture screen on server desktop session
 

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    <p>I have developed a GUI test framework that does integrationtesting of our company website on a scheduled basis. When something fails, it'll take a screenshot of the desktop, among other things. This runs unattended on a logged in user on a dedicated Windows Server 2008.</p> <p><strong>The problem</strong> is that taking a screenshot on a desktop that I have disconnected my remote desktop session from. I get the following exception:</p> <pre><code>System.ComponentModel.Win32Exception (0x80004005): The handle is invalid at System.Drawing.Graphics.CopyFromScreen(Int32 sourceX, Int32 sourceY, Int32 destinationX, Int32 destinationY, Size blockRegionSize, CopyPixelOperation copyPixelOperation) at System.Drawing.Graphics.CopyFromScreen(Point upperLeftSource, Point upperLeftDestination, Size blockRegionSize) at IntegrationTester.TestCaseRunner.TakeScreenshot(String name) in C:\VS2010\IntegrationTester\IntegrationTester\Config\TestCaseRunner.cs:line 144 at IntegrationTester.TestCaseRunner.StartTest() in C:\VS2010\IntegrationTester\IntegrationTester\Config\TestCaseRunner.cs:line 96 </code></pre> <p>The <strong>TakeScreenshot()</strong> method looks like this:</p> <pre><code>public static void TakeScreenshot(string name) { var bounds = Screen.GetBounds(Point.Empty); using (Bitmap bitmap = new Bitmap(bounds.Width, bounds.Height)) { using (Graphics g = Graphics.FromImage(bitmap)) { g.CopyFromScreen(Point.Empty, Point.Empty, bounds.Size); } bitmap.Save("someFileName", ImageFormat.Jpeg); } } </code></pre> <p>I have made sure that screensaver is set to "None" with no timeout. I have also implemented a piece of code that does a couple of pinvokes to <strong>send a mouse move</strong>, hoping it would generate a desktop graphics handle.. but no.</p> <pre><code>IntPtr hWnd = GetForegroundWindow(); if (hWnd != IntPtr.Zero) SendMessage(hWnd, 0x200, IntPtr.Zero, IntPtr.Zero); </code></pre> <p>Any advice is appreciated.</p>
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    1. USSilas Hansen
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    1. COWhat is the SendMessage all about? Are we meant to look up message code `0x200`? Couldn't you save us the bother and put in the appropriate WM_**. Anyway, you can't send a keypress, you need to post input. In C# you should use `SendKeys()`. That's probably not your real problem though!
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      1. USDavid Heffernan
    2. CO0x200 = WM_MOUSEFIRST.
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    3. COIs this an application or a service?
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