How do check if another application window is open on my machine (i.e., iterate through all open windows)?

I have an app that writes a series of text files to a folder on the user's machine. It then prompts them if they would like to open the folder to view all the files. I use System.Diagnostics.Process.Start() to do this and it wor开发者_如何学Cks well. However, if there is already a window with that folder open, I would just like to reuse that window instead of opening another one. Helps keep things tidy.

Any ideas?

Update: I tried this:

        if (MessageBox.Show("Compiled!  Open folder?", "Compile Done", MessageBoxButtons.YesNo) == System.Windows.Forms.DialogResult.Yes)
        {
            ProcessStartInfo Info = new ProcessStartInfo("explorer", Path);
            Info.UseShellExecute = false;

            Process.Start(Info);
        }

But it still opens a new window. I also tried setting UseShellExecute to true and I get the same result of a new window opening up.

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Just tried this on Windows XP:

System.Diagnostics.Process.Start(@"C:\Dev");
System.Threading.Thread.Sleep(10000);
System.Diagnostics.Process.Start(@"C:\Dev");

And it opened my C:\Dev folder. I then focused elsewhere. After 10 seconds, the C:\Dev window flashed and was highlighted again. So what are you doing different where it isn't working?

(Trying to find out if there's an open window displaying a particular folder is fraught and error prone. I wouldn't recommend it)

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If you use ShellExecute() to open the folder then Explorer will do the work for you and re-use an open Explorer window if one exists.

The .net way to call ShellExecute() is to set the UseShellExecute property of the ProcessStartInfo object that is passed to Process.Start().

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Update

Having now posted your code I can see the problem. You should ask the system to open the folder rather than trying to start a new explorer.exe process, as so:

ProcessStartInfo Info = new ProcessStartInfo(Path);
Process.Start(Info);