Re: Bug in GLib, libglade, libc?? (ok, it´s not GTK specific...)

["Samuel Cormier-Iijima" <sciyoshi gmail com>]

OK,

Your pointer code is all screwed up :-) g_strdup already allocates
memory so you don't need to do g_malloc before it, just
g_strdup_printf right into your variable. Also, your getting a
segfault because you're dereferencing the pointer where the pointer
itself is expected (when setting GtkEntry for example). Try dropping
the * and see if that works.

Samuel

On 8/15/06, Fabricio Rocha <rocha_fabricio yahoo com br> wrote:
> Hello, guys!
>
>         Sorry, I know i´m crossing the borders of off-topic. But I had to tell
> you that I could get rid of SEGFAULTs by using a GPtrArray* as member of
> my structure. As said before, this struct member shall hold one or more
> strings. (John, I have tried using a GList as this member, but I could
> not get it working as well. Maybe it was a erroneus attempt, however).
>
>         I just got curious about WHAT is the "magic" in GPtrArray that I could
> not "reproduce" using a gchar** variable. Man, I REALLY tried it, but
> you masters should be able to explain... My last attempt was that: the
> struct variable is called "var", the list of strings is the member
> "values". So, var->values was recognised by GDB as "gchar*[0]", and
> *var->values was recognised as "gchar*". You will probably find it very
> naive and exaggerated, but just realise the desperation:
>
> -------------------------
>         gchar *valuearea;
>         gchar *tempvalue;
>         VarInfo newvar;
>
>         tempvalue = g_strdup_printf ("variable%i",++varscount);
>         valuearea = (gchar*)g_malloc ((gulong)strlen(tempvalue));
>         valuearea = g_strdup (tempvalue);
>         newvar.name = valuearea;
>         (...)
>         valuearea = (gchar*) g_malloc (strlen(tempvalue=g_strdup("0")));
>         valuearea = g_strdup(tempvalue);
>         *newvar.values = valuearea;
>         newvar.parentvar = NULL;
>
>         var = g_malloc ((gulong)sizeof(newvar));
>         var = memcpy ((VarInfo*)var, (VarInfo*)&newvar, sizeof(newvar));
> -----------------------
>
>         I still don´t know what the hell I did wrong. Later in the code, I
> could access and use correctly "var->name", but I would get SEGFAULT in
> a line that a tried to set the text of a GtkEntry to *(var->values). GDB
> would tell me that it couldn´t access address 0x11 (TOO low address
> indeed). What was wrong there, gurus??
>
>         By the way, I´m pretty happy that it´s working fine with GPtrArray. But
> I can´t stop itching my head until I found out what I was doing wrong.... :)
>
> Thank you all, very much!
>
> Fabricio Rocha
> Brasilia, Brasil
>
>
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