[Gtk-sharp-list] Issue with Mono/GTK# app after threading (NewB)

[Paulo Pires]

Try reading about Gtk.ThreadNotify

This topic should be a must-know when starting to write threaded Gtk#
programs.

Paulo Pires


Ter, 2005-07-12 às 05:44 -0400, John Meadows escreveu:
> I am working on my first application written in Gnome/GTK# and mono
> 1.1.8 / Monodevelop; and I have run into an issue (if this is a NewB
> issue, I apologize in advance).
> 
> This application has a couple of methods that are run via threads
> (basically for filecopying, as my app. is a utility for managing MP3
> files on my MP3 player), and I have tried to use the examples I have
> seen online. Everything seems to work OK, but after I run one of these
> threaded methods the first time I see one of the following issues:
> 
> 1. If I display a FileSelection widget it comes up, but the text inside
> the widget (the list of files basically) is not visible, even though it
> appears to be there (as I have some debug code that fires off  a line to
> the console whenever a file is selected, so I think something is there
> even if it is not displaying)
> 
> 2. The main window of my application also uses a Treeview control. In a
> manner similar to #1 above, after running one of my threaded methods
> once, if I run a method to populate the treeview, neither the column
> headings or the test for the items in the Treeview appear (although
> again I have debug code writing to the console that shows there are
> items in the Treeview; it's just the text that is not appearing properly).
> 
> I am not sure where to go with this from a debugging point of view. I
> have put some sample code below, as maybe the issue is there, but I
> don't know, and of course I did not want to post everything. Is there
> some other refresh I need to call?
> 
> Any suggestions on what to try would be most appreciated!! Thanks in
> advance!
> 
> Here's some code
> 
> //copy single file to player
>    
>     void CopyFileToPlayer (object sender, EventArgs a)
>     {
>         clearLabel(); // resets status labels on window
>         lblStatus.Text = "File Copying in Progress...";
>         buttonCopySingle.Sensitive = false;
>         Thread oThread = new Thread(new ThreadStart(runSingleCopyThread));
>         oThread.Start();
>         notify = new ThreadNotify (new ReadyEvent (ready));
>         while (!oThread.IsAlive);
>     }
> 
> the method above calls:
> 
> //copy single file from playlist to player
> private void runSingleCopyThread()
> {
>         fc = new FileCommands(); //this is an assembly  use for copying
> the MP3 files
>         lblStatus.Text = "File Copying in Progress...";
>         fc.currentTrackFile = currentTrack;
>         fc.mp3PlayerPath = txtPlayerPath.Text +
> System.IO.Path.DirectorySeparatorChar.ToString();
>         fc.copyFile();
>         if(fc.oppStatus != "Copying Files...")
>         {
>             lblStatus.Text = fc.oppStatus;
>         }
>         notify.WakeupMain ();
>     }
> 
> The notification method is:
> 
> //called when file copying threads are done
> void ready ()
> {
>      buttonCopy.Sensitive = true;
>      buttonCopySingle.Sensitive = true;
>      lblStatus.Text = fc.oppStatus + ": " + fc.fileCopyCount  + "
> file(s) Copied";
>      this.ShowAll();
>  }
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