On Thu, 2005-02-17 at 13:05 +0100, Gert Cuykens wrote:
> static void callback( GtkWidget *widget, gpointer data ){
> g_print ("Hello again - %s was pressed\n", (gchar *) data);
> }
>
> why do they put () around gchar ?
> why can it not be gchar *data ?
gpointer is a void pointer and the call to g_print is expecting a gchar
pointer, hence the use of (gchar *) to change the pointer type.
> What does %s do ?
Same as in printf, look at the man page: man 3 printf.
> Are gpointer and gchar global variables of gtk ?
> Are gpointer and gchar data types or objects ?
> What does gpointer and gchar represent ?
You should consult a beginners guide to C programming so that you can
understand pointers and data types properly. There are also a number of
introductory C tutorials on the web, just search Google.
Keith.
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