passing argument/arguments signal to callback on GTK+ in C - c++

Question

Here is my code:
#include <gtk/gtk.h>
G_MODULE_EXPORT void waka(GtkWidget *button, GtkWidget* entry1)
{
printf("%s",gtk_entry_get_text(GTK_ENTRY(entry1)));
}
int main(int argc, char * argv[])
{
GtkWidget *window, *button, *entry;
gtk_init(&argc,&argv);
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
button = gtk_button_new_with_label("hha");
g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(waka),entry);
entry = gtk_entry_new();
GtkWidget *vbox;
vbox = gtk_vbox_new(FALSE,2);
gtk_box_pack_start_defaults(GTK_BOX(vbox),button);
gtk_box_pack_start_defaults(GTK_BOX(vbox),entry);
gtk_container_add(GTK_CONTAINER(window),vbox);
gtk_widget_show_all(window);
gtk_main();
return 0;
}
When I launch it, and try to fill in some string in the entry box, and then click the button, it said 'segmentation fault'. What is going on?
Also, the callback only works with one user data argument. How about if I want two or more arguments, what must I do in the callback function, and in the call to g_signal_connect()?

Answer 1

the problem is that you're trying to use pointer to entry before initializing it. I've changed a bit your code to fix this, see if it will work for you:
#include <gtk/gtk.h>
void waka(GtkWidget *button, GtkWidget* entry1)
{
g_print("entry: %s\n", gtk_entry_get_text(GTK_ENTRY(entry1)));
}
int main(int argc, char * argv[])
{
GtkWidget *window, *button, *entry, *vbox;
gtk_init(&argc, &argv);
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
button = gtk_button_new_with_label("hha");
entry = gtk_entry_new();
vbox = gtk_vbox_new(FALSE, 2);
gtk_box_pack_start_defaults(GTK_BOX(vbox),button);
gtk_box_pack_start_defaults(GTK_BOX(vbox),entry);
gtk_container_add(GTK_CONTAINER(window),vbox);
g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(waka), entry);
gtk_widget_show_all(window);
gtk_main();
return 0;
}
hope this helps, regards