Re: Strange Callback Behavior

["Peter Robinson t-online de" <Peter Robinson t-online de>]

-----Original Message-----
Date: Mon,  5 Jun 2006 15:47:36 +0200
Subject: Re: Strange Callback Behavior
From: Tristan Van Berkom 
To: Peter Robinson 

Peter Robinson wrote:
[...]
> void open_data_file(gpointer callback_data, guint callback_action,
GtkWidget  *widget) {
>   GtkWidget *filew;
[...]
>        g_signal_connect (G_OBJECT (GTK_FILE_SELECTION (filew)->ok_button),
>                                                                               "clicked", 
>                                                                               G_CALLBACK 
> (data_file_ok_sel), 
>                                                                                of_context);
>
> (...)
>
> In the function data_file_ok_sel, however, for some reason the
pointers 
> context->fs and context->label have different values, and the program
dumps core when it tries to read constext->fs as a file selection
widget:

Seems you are using the somewhat obscure "swapped" flag for your
"open_data_file"
callback... which you are not doing for "data_file_ok_sel"... where is
the
prototype for "data_file_ok_sel" ?

Cheers,
                       -Tristan

Thanks for the advice! I am not sure what you mean with the swap flag?!
Do I need to use the g_signal_connect_swapped here?


That function looks like this (simplified a bit) :

static void data_file_ok_sel(GtkWidget *w, void *ptr )
{
  int len;
        struct openfile_context *context;

        context = (struct openfile_context *) ptr;
        g_print("In CALLBACK will print out ptr \n");
        g_print("In CALLBACK pointer for callback  is %p\n",context); 
        g_print("In CALLBACK pointer for callback->fs  is %p\n",context->fs); 
        g_print("In CALLBACK pointer for callback->label  is
%p\n",context->label); 
        g_print("In CALLBACK pointer is %p\n",GTK_FILE_SELECTION
(context->fs)); 



  const char *tmp = gtk_file_selection_get_filename (GTK_FILE_SELECTION
(context->fs));

                g_print("In CALLBACK 2 \n"); 
        return;

  len  = strlen(tmp);
  strncpy(datafile,tmp,len);
  datafile[len] = 0;
  gtk_widget_destroy(GTK_WIDGET(GTK_FILE_SELECTION (context->fs)));
}




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