Problem with cmd.exe when we use process.start c#

Question

Good morning,

I am currently developing an application allowing the integration of several processes (application, like superputty does for putty) in a Windows Forms. This works for quite a few applications (like remote desktop), however, when I start cmd.exe, I have the correct pid, but I cannot retrieve the corresponding handle. CMD may start several handles in different processes.

Thank you very much in advance.

Here is part of the code:

m_Process.Start();
// attendre que le process soit disponible
m_Process.WaitForInputIdle();
//m_Process.Refresh(); // ??
// recup du handle de l'appli
m_Handle = m_Process.MainWindowHandle;
if (m_Handle == IntPtr.Zero)
{
    DateTime startTime = DateTime.Now;
    while ((DateTime.Now - startTime).TotalSeconds < 10 && m_Handle == IntPtr.Zero)
    {
        System.Threading.Thread.Sleep(50);

        // Refresh Process object's view of real process
        m_Process.Refresh();
        m_Handle = m_Process.MainWindowHandle;
    }
}
// put exe in the user control
if (m_Handle == IntPtr.Zero)
    MessageBox.Show("Handle nul");

Answer 1

Wait a moment for MainWindowHandle to become valid.
Perform timeout processing if necessary.:)

private void button1_Click(object sender, EventArgs e) {
    Process p = new Process {
        StartInfo = new ProcessStartInfo {
            FileName = "cmd.exe",
            WindowStyle = ProcessWindowStyle.Minimized
        }
    };
    p.Start();
    while (p.MainWindowHandle == IntPtr.Zero) {
        Thread.Sleep(100);
    }
    if (SetParent(p.MainWindowHandle, Handle) == IntPtr.Zero) {
        throw new Win32Exception();
    }
}

[DllImport("User32", SetLastError = true)]
private static extern IntPtr SetParent(IntPtr hWnd, IntPtr hWndParent);