Re: Gtk2::ImageView memory issue

[zentara <zentara1 sbcglobal net>]

On Wed, 04 Mar 2009 20:08:56 +0100
Mario Kemper <mario kemper googlemail com> wrote:

> Hi there,
>
> I've implemented parts of my application with help of the great
> Gtk2::ImageView module. 
> In the last days i've noticed some memory leaking and found out that
> Gtk2::ImageView::Tool::Selector is the reason for that. I've attached a
> little demo to demonstrate my problem. Each time you press the Button a
> screenshot will be taken and the ImageView will be updated. In this sub
> the Gtk2::ImageView::Tool::Selector is created each time. While pressing
> the button you can see that used memory will get higher and higher...So
> there is a possible memory leak here.
>
> Of course it is not useful to create the Gtk2::ImageView::Tool::Selector
> each time, but this is just a little test to demonstrate my problem (the
> functionality is in a module in my app).
>
> Does anyone has a clue what to do here? Maybe i am doing something
> totally wrong ...

> sub fct_take_screenshot {
>       my $button = shift;
>       my $view = shift;

>       #!!!!!!uncomment the following two lines to fix the memory leak here!!!!!!
>       my $selector    = Gtk2::ImageView::Tool::Selector->new($view);
>       $view->set_tool($selector);


I don't have Gtk2::ImageView installed, some dependency hassle IIRC.
But, you answered your own question... making a new selector probably is
bad.

You could try putting the following as a global in main:
my $selector    = Gtk2::ImageView::Tool::Selector->new( undef );


or possibly before you leave the sub: 
$selector->destroy;
undef $selector;

I've also had good luck, with just declaring a global like this, 
to reuse it's scalar namespace.

# in main
  my $selector;  #global scalar space

# in sub
        $selector    = Gtk2::ImageView::Tool::Selector->new($view);
        $view->set_tool($selector);

# at end of sub
      $view->set_tool(undef);
      $selector->destroy;
  

Just guessing at hacks from prior experience.
:-)

zentara


-- 
I'm not really a human, but I play one on earth.
http://www.zentara.net/~zentaran/My_Petition_to_the_Great_Cosmic_Conciousness.html