CODEWITHSUNDEEP
c#processsystem.diagnostics
Gangsteri
Gangsteri

Reputation: 51

Getting hWnd of a hidden window

How can i get hWnd of a hidden window? With my configuration it returns 0.

This is what i have tried:

ProcessStartInfo startInfo = new ProcessStartInfo(path);
startInfo.WindowStyle = ProcessWindowStyle.Hidden;

Process process = Process.Start(startInfo);
process.WaitForInputIdle();

MessageBox.Show(process.MainWindowHandle.ToString());

Upvotes: 0

Views: 1609

Answers (1)

Gangsteri
Gangsteri

Reputation: 51

This worked for me:

delegate bool EnumThreadDelegate(IntPtr hWnd, IntPtr lParam);

[DllImport("user32.dll")]
static extern bool EnumThreadWindows(int dwThreadId, EnumThreadDelegate lpfn,
    IntPtr lParam);

static IEnumerable<IntPtr> EnumerateProcessWindowHandles(int processId)
{
    var handles = new List<IntPtr>();

    foreach (ProcessThread thread in Process.GetProcessById(processId).Threads)
        EnumThreadWindows(thread.Id, 
            (hWnd, lParam) => { handles.Add(hWnd); return true; }, IntPtr.Zero);

    return handles;
}

Usage:

ProcessStartInfo startInfo = new ProcessStartInfo(path);
startInfo.WindowStyle = ProcessWindowStyle.Hidden;
Process process = Process.Start(startInfo);
process.WaitForInputIdle();

IntPtr WindowHandle = EnumerateProcessWindowHandles(process.Id).First();

Upvotes: 3

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