How do I bring an unmanaged application window to front, and make it the active window for (simulated) user input

Question

I am assuming I need to use pinvoke but I am not sure which function calls are needed.

Scenario: a legacy application will be running, I will have Handle for that ap

Answer 1

This has proved to be extremely reliable. The ShowWindowAsync function is specifically designed for windows created by a different thread. The SW_SHOWDEFAULT makes sure the window is restored prior to showing, then activating.

    [DllImport("user32.dll", SetLastError = true)]
    internal static extern bool ShowWindowAsync(IntPtr windowHandle, int nCmdShow);

    [DllImport("user32.dll", SetLastError = true)]
    internal static extern bool SetForegroundWindow(IntPtr windowHandle);

Then making the calls:

ShowWindowAsync(windowHandle, SW_SHOWDEFAULT);
ShowWindowAsync(windowHandle, SW_SHOW);
SetForegroundWindow(windowHandle);