GTK/Glade text entry string to global variable in C -

i creating menu gui game using glade , gtk in c. have text entry box , button. when button pressed, value inside text entry needs saved global variable. don't know how value inside text entry i'm bit stuck. great.

function

void on_okbutton_clicked (gtkbutton *object, gpointer user_data) { //??????? } 

edit:

this current code looks like

#include <stdio.h> #include <gtk/gtk.h> #include <python2.7/python.h>   void on_window1_destroy (gtkobject *object, gpointer user_data) { gtk_main_quit(); }  void on_okbutton_clicked (gtkbutton *object, gpointer user_data) {  gchar *entry_value;//this can global variable, too, of course entry_value = gtk_entry_get_text(//get text function     gtk_entry(//use gtk_entry widget         (gtkwidget *) user_data //cast gtkwidget pointer     ) );  }   int main(int argc, char *argv[]) {     gtkbuilder *gtkbuilder;     gtkwidget *window;     gtkwidget *quit;     gtkwidget *ok;     gtkwidget *entry = gtk_entry_new();     gtk_init(&argc, &argv);      gtkbuilder = gtk_builder_new();     gtk_builder_add_from_file(gtkbuilder, "ipenter.glade", null);     window = gtk_widget(gtk_builder_get_object(gtkbuilder, "window1"));      ok = gtk_widget(gtk_builder_get_object(gtkbuilder, "okbutton"));     g_signal_connect(g_object(ok),"clicked",g_callback(on_okbutton_clicked),entry);      g_object_unref(g_object(gtkbuilder));     gtk_widget_show(window);     gtk_main();      return 0; } 

assuming connected signal correctly, ought work fine:

gchar *entry_value;//this can global variable, too, of course entry_value = gtk_entry_get_text(//get text function     gtk_entry(//use gtk_entry widget         (gtkwidget *) user_data //cast gtkwidget pointer     ) ); 

just sure, how should connect signal:

g_signal_connect(     g_object(your_btn),     "clicked",     g_callback(         on_okbutton_clicked     ),     txt_entry_pointer ); 

where txt_entry_pointer is, of course, pointer entry widget. not, however, make surprisingly common mistake of passing address of local pointer here. if create entry widget so:

gtkwidget *entry = gtk_entry_new(); 

and attempt connect signal so:

g_signal_connect(     g_object(your_btn),     "clicked",     g_callback(         on_okbutton_clicked     ),     &entry// <=== wrong!! ); 

you passing pointer stack pointer, resulting in undefined behaviour. drop ampersand code above.

also worth mentioning gchar typedef char type. means that:

gchar *foobar; 

is same writing

char *foobar; 

as can see here.