no need to declare *str, like this:
void edit_changed (GtkWidget *widget, gpointer *data)
{
gchar *strcopy;
strcopy = g_strdup(gtk_entry_get_text (GTK_ENTRY (widget)));
g_print ("Entry changed to %s\n", strcopy);
g_free(strcopy);
}
On Apr 17, 2007, at 8:09 AM, William D. Tallman wrote:
> On Mon, Apr 16, 2007 at 05:01:29PM -0600, Michael L Torrie wrote:
>> On Tue, 2007-04-17 at 08:22 +1000, Andrew Cowie wrote:
>>> Return type of gtk_entry_get_text() is (const gchar*), not just
>>> (gchar*). You discarded the const qualifier when assigning the
>>> result to
>>> str.
>>>
>>> Just declare str with const.
>>
>> The reason why this is important is because gtk_entry_get_text is
>> returning you just a pointer to a buffer inside the widget.
>> Therefore
>> you should never modify it. If you do, you run the risk of
>> crashing the
>> program. That's why the return type is const and the compiler
>> gives you
>> a warning.
>>
>> If you want to do something to the string you need to copy it with
>> g_strdup, remembering to free your copy when you are done.
>>
>> Michael
>
> Then it should be like this?
>
> void edit_changed (GtkWidget *widget, gpointer *data)
> {
> const gchar *str;
> gchar *strcopy;
>
> str = gtk_entry_get_text (GTK_ENTRY (widget));
>
> strcopy = g_strdup(str);
>
> g_print ("Entry changed to %s\n", strcopy);
>
> free(strcopy);
> }
>
> I'm no whiz with C itself and have never used strdup. IIUC, the
> template is as above, replacing the g_print with whatever is to be
> done
> with the copied string. Is that correct? If not, what don't I
> understand here?
>
> Thanks,
>
> Bill Tallman
>
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>
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