How to get process name and title of the top window on Windows / C#

Question

As in the topic... or better - how to get this information from events when the top window changes?

Answer 1

You can find window handle by process name using this code:

 Process[] processes = Process.GetProcessesByName(m.ProcessName);
                                    if (processes != null && processes.Length > 0)
                                    {
                                        Process process = processes[0];
                                        process.StartInfo.WindowStyle = ProcessWindowStyle.Normal;
                                        process.Refresh();
                                        if (process.MainWindowHandle != IntPtr.Zero)
                                        { // process.mainwindows handle is needed for you

and than you can find window text by handle title = GetWindowTitle(process.MainWindowHandle);

private String GetWindowTitle(IntPtr hWn)
        {
            object LParam = new object();
            int WParam = 0;
            StringBuilder title = new StringBuilder(1024);
            SendMessage(hWn, WM_GETTEXT, WParam, LParam);
            GetWindowText(hWn, title, title.Capacity);
            return title.ToString();

        }

You need following declarations to call winapi functions:

 [DllImport("user32", CharSet = CharSet.Auto, SetLastError = true)]
        internal static extern int GetWindowText(IntPtr hWnd, [Out, MarshalAs(UnmanagedType.LPTStr)] StringBuilder lpString, int nMaxCount);
        [DllImport("User32.dll", EntryPoint = "SendMessage")]
        public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, object lParam);