Hi.

I'm trying to write a web client that uses LWP and Tk. Unfortunately, calls to get() keep blocking and freezing-up the program for often-significant amounts of time while LWP sends the request and receives response. Is there some way to get around this besides using Thread.pm or threads.pm? I tried update(), but that didn't seem to work. What I really need is way to call get() (or request()) and get access to the response object without the windows freezing and becoming unresponse for a while. Here's some example code:

#!/usr/bin/perl -w
use strict;
use Tk;
use Tk::Pane;
use LWP;

use vars qw($URL);
use vars qw($DOC_VIEWER);
use vars qw($DOC);

my $lwp = new LWP::UserAgent;

my $browser = new MainWindow;

my $url_entry_frame = $browser->Frame->pack(-side => 'top', -padx => 3
+, -pady => 4);
$url_entry_frame->Entry(
    -textvariable => \$URL, -width => 100
)->pack(-side => 'left', -padx => 1);
$url_entry_frame->Button(
    -text => 'GO', -command => sub { sendRequest() }
)->pack(-side => 'left', -padx => 1);

$DOC_VIEWER = $browser->Scrolled('Pane', Name => 'doc_viewer',
    -scrollbars => 'se',
    -sticky     => 'we',
    -gridded    => 'y'
)->pack(-expand => 1, -fill => 'both');

my $status = $browser->Label->pack(-side => 'bottom');


MainLoop;



sub sendRequest {
    $DOC->destroy if ($DOC);

    $status->update;
    $status->configure(-text => 'Requesting...');
    my $response = $lwp->get($URL);
    $status->configure(-text => 'Done.');

    if ($response->is_success)
    {
        $DOC = $DOC_VIEWER->Label(-text => $response->content)->pack;
    }
    else
    {
        die $response->error_as_HTML;
    }
}

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In reply to Tk, LWP, and blocking? by Anonymous Monk

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