c# - How do I focus a foreign window?

Question

I have an application which may only have one instance of itself open at a time. To enforce this, I use this 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.
//...

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.

How do I do that?

SetForegroundWindow works, to a point:

[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;
}
// ...

This does bring the window to the foreground if it is not minimized. Awesome. If the window IS minimized, however, it remains minimized.

It needs to un-minimize.

Solution via SwitchToThisWindow (Works!):

[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 ;-)
}

Answer 1

I had the same problem and SwitchToThisWindow() worked the best for me. The only limitation is that you must have XP sp1 installed. I played with SetForegroundWindow, ShowWindow, and they both had problems pulling the window into view.