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POHow do I focus a foreign window?
 

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    <p>I have an application which may only have one instance of itself open at a time. To enforce this, I use this code:</p> <pre><code> System.Diagnostics.Process[] myProcesses = System.Diagnostics.Process.GetProcesses(); System.Diagnostics.Process me = System.Diagnostics.Process.GetCurrentProcess(); foreach (System.Diagnostics.Process p in myProcesses) { if (p.ProcessName == me.ProcessName) if (p.Id != me.Id) { //if already running, abort this copy. return; } } //launch the application. //... </code></pre> <p>It works fine. I would also like it to be able to focus the form of the already-running copy. That is, before returning, I want to bring the other instance of this application into the foreground.</p> <p>How do I do that?</p> <p>Re: SetForeGroundWindow:</p> <p>SetForeGroundWindow works, to a point:</p> <pre><code> [System.Runtime.InteropServices.DllImport("user32.dll")] public static extern bool SetForegroundWindow(IntPtr hWnd); //... if (p.Id != me.Id) { //if already running, focus it, and then abort this copy. SetForegroundWindow(p.MainWindowHandle); return; } //... </code></pre> <p>This does bring the window to the foreground if it is not minimized. Awesome. If the window IS minimized, however, it remains minimized.</p> <p>It needs to un-minimize.</p> <p>Solution via SwitchToThisWindow (Works!):</p> <pre><code> [System.Runtime.InteropServices.DllImport("user32.dll")] public static extern void SwitchToThisWindow(IntPtr hWnd, bool fAltTab); [STAThread] static void Main() { System.Diagnostics.Process me = System.Diagnostics.Process.GetCurrentProcess(); System.Diagnostics.Process[] myProcesses = System.Diagnostics.Process.GetProcessesByName(me.ProcessName); foreach (System.Diagnostics.Process p in myProcesses) { if (p.Id != me.Id) { SwitchToThisWindow(p.MainWindowHandle, true); return; } } //now go ahead and start our application ;-) </code></pre>
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    1. COCheck to see if the window IsIconic, if so call ShowWindow http://msdn.microsoft.com/en-us/library/ms633527(VS.85).aspx http://msdn.microsoft.com/en-us/library/ms633548(VS.85).aspx
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