[Mono-winforms-list] Updating GUI from an asynchronous thread

[Ian Norton]

Reading your program, it looks like you only run the gtk main loop when
your child gives you data.

Also, that is gtk, this is the win forms list :-)
On 2 Apr 2013 21:18, "Neil Thackeray" <neilt at illinois.edu> wrote:

> I'm having trouble getting the output from a command line program to
> appear in the main window of a form. For simplicity I'm just trying to get
> it to appear in a label for now. When I run the function RunIt nothing from
> stdout of the child process appears in the label, but ConsoleWriteline
> seems to pick it up just fine. When it gets down to the while loop it
> updates the label perfectly fine.
>
> I've also noticed that the form seems to be locked while the child process
> is running. When I was just using BackgroundWorker without
> Application.Invoke the form updated from the child process and the while
> loop, but the update was spotty and the application crashed sporadically.
>
> Any suggestions are appreciated.
>
> Thanks
>
> namespace windowtest
> {
> public partial class MainWindow: Gtk.Window
> {
>     public MainWindow (): base (Gtk.WindowType.Toplevel)
>     {
>          Build ();
>     }
>
>     protected void OnDeleteEvent (object sender, DeleteEventArgs a)
>     {
>         Application.Quit ();
>         a.RetVal = true;
>     }
>
>         public void RunIt ()
>         {
>             string prog = @"C:/Program Files (x86)/Program/Program.exe";
>             // Start the child process.
>             System.Diagnostics.Process p = new
> System.Diagnostics.Process();
>             p.StartInfo.UseShellExecute = false;
>             p.StartInfo.Arguments = "Program Arguments";
>             p.StartInfo.**RedirectStandardOutput = true;
>             p.StartInfo.FileName = prog;
>             p.StartInfo.CreateNoWindow = true;
>             p.EnableRaisingEvents = true;
>             // Redirect the output stream of the child process.
>             p.OutputDataReceived += new DataReceivedEventHandler(
>                 delegate(object sender, DataReceivedEventArgs e)
>                 {
>                     if (!String.IsNullOrEmpty(e.Data)**)
>                     {
>                         lblTest.Text = e.Data;
>                         while (Gtk.Application.EventsPending ())
>                             Gtk.Application.RunIteration ();
>                         Console.WriteLine(e.Data);
>                     }
>                 }
>             );
>             p.Start();
>             p.BeginOutputReadLine();
>             p.WaitForExit();
>             p.Close();
>             int i = 0;
>             while (i < 20)
>             {
>                 lblTest.Text = i.ToString();
>                 while (Gtk.Application.EventsPending ())
>                     Gtk.Application.RunIteration ();
>                 Console.WriteLine(i.ToString()**);
>                 i++;
>                 System.Threading.Thread.Sleep (100);
>             }
>             lblTest.Text = "Test";
>         }
>
>         protected void OnButton4Clicked (object sender, EventArgs e)
>         {
>             System.ComponentModel.**BackgroundWorker bw = new
> System.ComponentModel.**BackgroundWorker();
>             bw.WorkerSupportsCancellation = true;
>             bw.DoWork += new System.ComponentModel.**
> DoWorkEventHandler(TestInvoke)**;
>             if (bw.IsBusy != true)
>             {
>                 bw.RunWorkerAsync();
>             }
>         }
>         private void TestInvoke(object sender, System.ComponentModel.**DoWorkEventArgs
> e)
>         {
>             Application.Invoke(delegate{ RunIt(); });
>         }
> }
> }
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