Re: Timer start registration breaks the gtk_main()

[Nicola Fontana <ntd entidi it>]

Il giorno Sat, 26 Mar 2011 11:38:27 -0700 (GMT-07:00)
ikorot earthlink net ha scritto:

> Hi, Robert,
> 
> 
> -----Original Message-----
> >From: Robert Pearce <rob bdt-home demon co uk>
> >Sent: Mar 26, 2011 2:19 AM
> >To: gtk-list gnome org
> >Cc: ikorot earthlink net
> >Subject: Re: Timer start registration breaks the gtk_main()
> >
> >Hi ikorot earthlink net,
> >
> >On Sat, 26 Mar 2011 01:54:31 -0700 (GMT-07:00) you wrote:
> >> Hi, ALL,
> >> Is it possible for the timer to cause gtk_main() to crash?
> >>
> >It's possible for anything to become the point where your program
> >crashes if you are sufficiently badly abusing it. Why do you pick on
> >"the timer" as your suspect? 
> 
> If I comment out the call to g_timer_add_seconds() it does not crash.
> 
> Here is what I do:
> 
> int main()
> {
>       CFrame *frame = new CFrame();
>       result = frame->OpenPort();
>       if( !result )
>           return 1;
>       else
>       {
>            g_timer_add_seconds( 1, (GSourceFunc) frame->ReadData(), NULL );
>            gtk_widget_show( window );
>            frame->ReadData();
>            gtk_main();
>       }
> }
> 
> in frame.h:
> 
> class CFrame
> {
>      void ReadData();
> }
> 
> Do you see any problems with that?
> Basically followed example from http://zetcode.com/tutorials/gtktutorial/gtkevents/.

ReadData() is not a good old C function, but a C++ method, carrying
around a pointer to the CFrame instance. You should make ReadData() static
or use more advanced tecniques, such as libsigc++ [1].

Ciao.
-- 
Nicola


[1] http://libsigc.sourceforge.net/

> 
> >
> >> How do I debug/fix it?
> >> 
> >
> >There are many answers to this, all outside the scope of this mailing
> >list. How do you normally approach debugging?
> 
> Just run the program under gdb and get the point of crash.
> Check all the variables at runtime under gdb.
> Then study the code and see what the problem is.
> 
> Thank you.
> 
> >
> >Cheers,
> >Rob
> 
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