-----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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