user interface - Changing GTK label in C using signal_connect -

hello making gui in gtk have menu items, , trying change main label after clicking mouse on specific menu element.

widgets[i][0] = gtk_menu_item_new_with_label(arrayofstrings[i]); //arrayofstrings : char** arrayofstrings gtk_menu_shell_append(gtk_menu_shell(indicator_menu), widgets[i][0]); 

i trying this:

void set_main_label(gtkwidget *widget) {     app_indicator_set_label(indicator, arrayofstring[2],arrayofstring[2]); } 

and after call like:

g_signal_connect(widgets[i][0], "activate",g_callback(set_main_label), widgets[i][0]); 

but problem void set_main_label(void) must have void argument. , need pass there string (char*) stored in arrayofstrings. suggest? can change label 1 specific string set in set_main_label function, cannot pass argument function, suggest? .

this user_data parameter for. set_main_label() not have void argument list - check documentation:

void user_function (gtkmenuitem *widget,                gpointer     user_data) 

you can pass argument callback via user_data parameter. must known @ time connect signal.

so this:

void set_main_label(gtkmenuitem *widget, gpointer user_data) {     const char *label = (const char *)user_data;     app_indicator_set_label(indicator, label, label); }  g_signal_connect(widgets[i][0], "activate",     g_callback(set_main_label), arrayofstring[2]);