Re: Timer start registration breaks the gtk_main()

[Robert Pearce <rob bdt-home demon co uk>]

Hi ikorot earthlink net,

On Sat, 26 Mar 2011 11:38:27 -0700 (GMT-07:00) you wrote:
> Hi, Robert,
> 
> 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?

Yes. You are casting the _RESULT_ of a _CALL_ to ReadData into a GSourceFunc, but ReadData returns void. This produces utterly random results.

The second argument of g_timeout_add_seconds is a function pointer, and requires that you pass it a simple C function reference _without_ the call syntax.

Cheers,
Rob