Re: About gtk_label_set_text()

[learfox furry ao net]

> Hello list:
>
> I'm trying to write a simple application. One button with label "1", and
> every time the user do a click on it, the label must increase the label
> by one. 1 --> 2 --> 3 etc...
>
> I have found that I only can use a const string
> (gtk_label_set_text(label, "anything") but no way to do what I say. How
> can I do that.


Hmm, how about this, make a callback for "clicked" where the data passed
is the label widget. Like this;

static void my_button_cb(GtkWidget *button, gpointer data)
{
        int number;
        const char *cstrptr;
        char *strptr;
        char tmp_str[256];
        GtkLabel *label = (GtkLabel *)data;
        if(label == NULL)
                return;

        /* Get label, assumed format is any numerical value. */
        cstrptr = (const char *)gtk_label_get_text(label);
        if((cstrptr != NULL) ? isdigit(*cstrptr) : 0)
        {
                /* Get the old label string, convert it to a number and
                 * increment by 1.
                 */
                number = atoi(cstrptr) + 1;

                /* Set the new label. */
                sprintf(tmp_str, "%i", number);
                gtk_label_set_text(label, (const char *)tmp_str);
        }

        return;
}

I think this should work! When you attach the signal, make sure you
pass the label widget as the client data pointer.

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