http://qs321.pair.com?node_id=265082

Foggy Bottoms has asked for the wisdom of the Perl Monks concerning the following question:

I'm currently developing a win32::GUI based application where I want to track window events. I want to know which is the active window at any time.

The code for this is the following
Win32::GUI::GetForegroundWindow();

What I want is to save the value it returns when it changes. For the time being, I'm using the following bit of code :
while(1)
{
   $activeWindow=Win32::GUI::GetForegroundWindow();
}
The best thing would be to write a listener that'd be triggered when there's an active window changed. Does anyone have an idea ? Thanks guys.

Replies are listed 'Best First'.
Re: create a listener in Win32::GUI
by dada (Chaplain) on Jun 11, 2003 at 16:43 UTC
    if you mean which Win32::GUI window is the active one, you can simply track this with the Activate() events. an example: 
    my $activeWindow;

sub Window1_Activate {
    $activeWindow = $Window1;
}

sub Window2_Activate {
    $activeWindow = $Window2;
}

sub Window3_Activate {
    $activeWindow = $Window3;
}

# and so on...

    [download]
    if you instead mean any window on your screen (and you don't need realtime monitoring -- which will hog your CPU), then I would do it setting up a timer object: 
    my $checkActive = $Window1->AddTimer(
    -name => "checkActive", 10 
);
# note: 10 milliseconds means 100 times/second

sub checkActive_Timer {
    $activeWindow = Win32::GUI::GetForegroundWindow();
}

    [download]
    hope this helps...

    cheers,
    Aldo

    King of Laziness, Wizard of Impatience, Lord of Hubris

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