Aaron Walker <[EMAIL PROTECTED]> writes:
> I have a callback that is called when I exit the main window:
>
> void main_destroy_cb (GtkWidget *widget, GWindow *gfind)
> {
> g_string_free(gfind->cmd, TRUE);
> g_free(gfind->entry);
> g_free(gfind);
> gtk_main_quit();
> }
>
> The GString gfind->cmd is initialize in the function that calls this
> callback, which means that on exit, my program is assuming that
> gfind->cmd has been initialized. I thought that this would work to
> check it:
>
> if(gfind->cmd != NULL)
> g_string_free(gfind->cmd, TRUE);
>
> which didn't work, so I tried:
>
> if(gfind->cmd->str != NULL)
> g_string_free(gfind->cmd, TRUE);
>
> which also did not work (segfaults).
>
> I am trying to avoid initializing the GString right away, to prevent
> this. I would just like to check if it is null or not.
Well, you need to remember that if you create a structure
with malloc() or g_new(), the fields of the structure will
not be initialized to NULL. You need to do this explicitely
yourself. Alternatively, you can use the functions
g_malloc0() and g_new0() to zero out the memory when it
is allocated.
[ Actually, assumming that NULL will have a bit-pattern of
all zeros is not standard ANSI C, though it works
universally on the platforms where GTK+ runs. ]
Regards,
Owen
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