newbie: callback function

["F. Kater" <f kater2 gmx net>]

Hi,

with msvc6.0 I had no problems but mingw/gcc gives me the following
error in the function call gtk_box_pack_start (see below): "invalid
conversion from'void(*)()' to'void*'. The problem is the function
pointer "callback_init" which gcc doesn't accept this way. But what's
wrong?

Felix



my callback:
------------

void callback_init() { /* ... */ }


my button create function (not quite important here):
-----------------------------------------------------

GtkButton *button_create(
	const char *text,
	void *callbackfunction)
{
	GtkWidget *gtkwidget1;
	gtkwidget1 = gtk_button_new_with_label(text);
	g_signal_connect(
		G_OBJECT(gtkwidget1),
		"clicked",
		G_CALLBACK(callbackfunction),
		NULL);
	gtk_widget_show(gtkwidget1);
	return GTK_BUTTON(gtkwidget1);
}


the main with the function which causes the error (see description):
-------------------------------------------------------------------

int main( /*...*/ ){

/*...*/

gtk_box_pack_start(
	GTK_BOX(hbox2),
	GTK_WIDGET(
		button_create(
			"My Button Name",
			callback_init   /* error */
		)
	),
	INT_EXPAND,
	cgboolean_fill,
	cint_padding
	);


/*...*/

}