Paul, As it has been said, your function needs to have the correct format, i.e.
gboolean play_cb (GtkWidget *widget, gpointer ptr) {} Andy ---------------------------------------- From: Paul Santa Maria <[EMAIL PROTECTED]> Sent: Tuesday, December 13, 2005 7:01 PM To: gtk-app-devel-list@gnome.org Subject: Reference to a C++ object in GTK+ callbacks Hi - I'm using the GTK+ 2.6.4 that came with Suse 9.3. I'm coding in C++, but using the "raw" GTK+ C libraries. I'm trying to pass a pointer to one of my C++ classes into a callback, so that I can call a method on that class. The code looks like this: 1. less hbaview.h => -------------- class HbaviewApp { ... private: AnimationFile *m_animation; ... class Hbafile : public AnimationFile { public: Hbafile (GtkWidget *da); virtual ~Hbafile (); virtual void open (const char *fname); virtual void close (); virtual void start (); ... 2. less HbaviewApp.cpp => ------------------- void init () ... GtkWidget *play = gtk_image_menu_item_new_from_stock ( "gtk-media-play", accel_group); gtk_widget_show (play); gtk_container_add (GTK_CONTAINER (menu3), play); gtk_signal_connect (GTK_OBJECT (play), "activate", G_CALLBACK (play_cb), m_animation); ... 3. less callbacks.cpp => ------------------ gboolean play_cb (gpointer data) { // Deference the object pointer to do the actual work AnimationFile *ani = (AnimationFile *)data; ani->start (); } "ani->start()" works fine outside of the callback. I know my Animation object has been successfully created and that "m_animation" points to it before I call gtk_signal_connect(). But it crashes with a signal SIGSEGV, Segmentation fault when the play_cb callback tries to call ani->start(). Any idea what I might be doing wrong? Or tips for debugging the problem? Thanx in advance! _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list