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PODrawing over all windows on multiple monitors
 

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    <p>I am using the following code to draw on a single monitor:</p> <pre><code>Point cursorLocation; NativeMethods.GetCursorPos(out cursorLocation); Screen screen = Screen.FromPoint(cursorLocation); Point h1 = new Point(screen.Bounds.Left, cursorLocation.Y); Point h2 = new Point(screen.Bounds.Right, cursorLocation.Y); Point v1 = new Point(cursorLocation.X, screen.Bounds.Top); Point v2 = new Point(cursorLocation.X, screen.Bounds.Bottom); using (Graphics graphics = Graphics.FromHwnd(NativeMethods.GetDesktopWindow())) { NativeMethods.SHChangeNotify(0x8000000, 0x1000, IntPtr.Zero, IntPtr.Zero); graphics.DrawLine(Pens.Red, h1, h2); graphics.DrawLine(Pens.Red, v1, v2); } </code></pre> <p>Natively, this <em>should</em> <em>theoretically</em> draw on either monitor. However, it only draws on the primary. So, to fix this I am getting the DC of all the displays and trying to do it this way.</p> <pre><code>IntPtr hdc = NativeMethods.CreateDC("DISPLAY", IntPtr.Zero, IntPtr.Zero, IntPtr.Zero); Graphics graphics = Graphics.FromHdc(hdc); graphics.DrawLine(Pens.Red, h1, h2); graphics.DrawLine(Pens.Red, v1, v2); graphics.Dispose(); NativeMethods.ReleaseDC(IntPtr.Zero, hdc); </code></pre> <p>Go figure, this doesn't even draw to the screen at all. I have tried various overloads for CreateDC, as well as searched SO and other resources and I'm stumped. </p> <hr> <p>Once this is resolved, anyone know how to get rid of flicker by refreshing the desktop using SHCHangeNotify? I'm only drawing two lines and it flickers like mad..)</p>
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