Re: Re: Perl::Tk - Event sequencing question

[crabbdean]

In reference to your last comments about piping to a text box, I've already posted a solution on how to do this. See this --> Re: Perl::TK - fileevent and script execution theory

The two solutions you mentioned above I've tried but this I found works best for short events that don't freeze the gui. My problem at current is an event that takes about 30 mins, a large "tar"ing process. Thanks anyway :-)

[periapt]

Yeah, I've had that problem with long running processes too. I once tried to implement an archive process one file at a time with a counter updating the main screen but it was an ugly, inefficient thing. I went with a command line instead.

Thanks for the link. It answered several questions I've had kicking around in the back of my mind. Maybe I'll be more motivated to try a solution sooner rather than later.

PJ

[crabbdean]

You know after some thought and investigation it became apparant to me that if you have a long running process you always need to output the "fileevent" using the below subroutine. If not your gui freezes until the event finishes. Personally I think this subroutine should included as a feature or at least in the code given in the "fileevent" documentation considering it appears to be a common thing people want to do.

Essentially it goes like this ... create a widget to write to (a scrollable text box in your mainwindow $mw in this example), open your handle and call the fileevent ...

my $tx = $mw->Scrolled("Text", -width => 80,
                -height => 25,
                -wrap => 'none',
                )->pack(-expand => 1,
                    -fill => 'both');
open(CHILD, "ls -laR |") or die "Can't open: $!";
CHILD->autoflush(1);
$mw->fileevent('CHILD', 'readable', [\&output, \*CHILD, $mw, $tx]);

Include the following subroutine to output what is streamed to the filehandle without freezing the GUI.

sub output {
    my ($handle, $widget, $tx) = @_;
    
    if (sysread ($handle, $_, 128)) {
        $tx->insert('end', $_); # Append the data read
        $tx->yview('end');
    } else {
        $tx->insert('end', "\nALL DONE\n");
        $tx->yview('end');
        $widget->fileevent($handle, "readable", undef); # cancel bindi
+ng
        ###----->>> Add in cancel routine here if you want to exit gra
+cefully
        return;
    }
    $widget->idletasks;
}