C＃列出具有GUI的正在运行的应用程序

Question

How could I list all running applications which have a GUI in C#? I am trying to make some sort of a taskbar, so I have to know what processes are running. I can't list all processes of course, because that would be a total disaster. My idea is to only list processes with a gui, because that seems like what's happening in the "stock" taskbar.

Answer 1

This code will fill a dropdown and set get it on foreground by selection, you can do it like this

    [DllImport("User32.dll")]
    static extern bool ShowWindow(IntPtr hWnd, uint nCmdShow);
    [DllImport("User32.dll")]
    private static extern bool SetForegroundWindow(IntPtr hWnd);

    private void ListTask()
    {
        Process[] processes = Process.GetProcesses();
        foreach (Process process in Process.GetProcesses().
                                     Where(p => !string.IsNullOrEmpty(p.MainWindowTitle)).ToList())
            listBox1.Items.Add(process.ProcessName);
    }

    private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
    {
        Process p = new Process();
        string name = listBox1.SelectedItem.ToString();
        p = Process.GetProcessesByName(name)[0];
        const uint SWP_SHOWWINDOW = 0x0001;
        ShowWindow(p.MainWindowHandle, SWP_SHOWWINDOW);
        SetForegroundWindow(p.MainWindowHandle);
        p.Dispose();
    }

Answer 2

You can list all processes that have a main window:

static IEnumerable<Process> WindowProcesses()
{
    foreach(var proc in Process.GetProcesses())
    {
        if(proc.MainWindowHandle != IntPtr.Zero)
        {
            yield return proc;
        }
    }
}

This will enumerate all processes that have a main window, but may not necessarily list all processes that have any visible windows (eg services). For that, you need to P/Invoke EnumWindows and GetWindowThreadProcessId .