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POGet DeviceContext of Entire Screen with Multiple Montiors
 

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    <p>I need to draw a line (with the mouse) over everything with C#. I can get a Graphics object of the desktop window by using P/Invoke:</p> <p>DesktopGraphics = Graphics.FromHdc(GetDC(IntPtr.Zero));</p> <p>However, anything I draw using this graphics object is only showing on the left monitor, and nothing on the right monitor. It doesn't fail or anything, it just doesn't show.</p> <p>After I create the Graphics object, it shows the visible clip region to be 1680 x 1050 which is the resolution of my left monitor. I can only assume that it's only getting a device context for the left monitor. Is their a way to get the device context for both (or any number) monitors?</p> <hr> <p><strong>EDIT 3/7/2009: Additional information about the fix I used.</strong></p> <p>I used the fix provided by colithium to come up with the following code for creating a graphics object for each monitor as well as a way to store the offset so that I can translate global mouse points to valid points on the graphics surface.</p> <pre><code>private void InitializeGraphics() { // Create graphics for each display using compatibility mode CompatibilitySurfaces = Screen.AllScreens.Select(s =&gt; new CompatibilitySurface() { SurfaceGraphics = Graphics.FromHdc(CreateDC(null, s.DeviceName, null, IntPtr.Zero)), Offset = new Size(s.Bounds.Location) }).ToArray(); } private class CompatibilitySurface : IDisposable { public Graphics SurfaceGraphics = null; public Size Offset = default(Size); public PointF[] OffsetPoints(PointF[] Points) { return Points.Select(p =&gt; PointF.Subtract(p, Offset)).ToArray(); } public void Dispose() { if (SurfaceGraphics != null) SurfaceGraphics.Dispose(); } } [DllImport("gdi32.dll")] static extern IntPtr CreateDC(string lpszDriver, string lpszDevice, string lpszOutput, IntPtr lpInitData); </code></pre>
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    1. COOk, now, this is really, really odd. Your code works for FillRectangle() but not for DrawString and other methods of SurfaceGraphics object. DrawString always draws on Primary display, no meter what SurfaceGraphics I am using, but FillRectangle behaves correctly. :|
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