Monitoring directory changes with gnomevfs

["Damien Moore" <damien moore excite com>]

Hi List, 


I'm trying to use the directory monitoring API in gnomevfs, but I'm
having difficulty understanding how it is supposed to be used. The
documentation at
http://library.gnome.org/devel/gnome-vfs-2.0/unstable/gnome-vfs-20-gnome-vfs-monitor.html
doesn't have any examples and I haven't been able to find a simple
example on the web. The API seems simple enough, but I'm not sure I
understand how the callback mechanism is supposed to work. (This
probably reflects a deeper lack of understanding of glib, but I'll
persist...)


For example, I gather this program won't work because there is no GMainLoop in place to generate the callback:


#include <libgnomevfs/gnome-vfs.h>


int exit=0;


static void MonitorCallback(GnomeVFSMonitorHandle *handle, const gchar
*monitor_uri, const gchar *info_uri, GnomeVFSMonitorEventType
event_type, gpointer user_data)

{

    exit=1;

}


int main()

{

    if(!gnome_vfs_initialized())

        gnome_vfs_init();

    GnomeVFSMonitorHandle *h;

    gnome_vfs_monitor_add(&h, "/home/myusername", GNOME_VFS_MONITOR_DIRECTORY, MonitorCallback, NULL);

    while(!exit);

    gnome_vfs_monitor_cancel(h);

    return 0;

}


but something like this should work correctly?


#include <glib.h>

#include <libgnomevfs/gnome-vfs.h>


static void MonitorCallback(GnomeVFSMonitorHandle *handle, const gchar
*monitor_uri, const gchar *info_uri, GnomeVFSMonitorEventType
event_type, gpointer user_data)

{

    g_print("Monitor event received, exiting...\n");

    g_main_loop_quit((GMainLoop*)user_data);

}


int main()

{

    if(!gnome_vfs_initialized())


        gnome_vfs_init();


    GMainLoop *loop;

    loop = g_main_loop_new(NULL, FALSE);

    GnomeVFSMonitorHandle *h;

    gnome_vfs_monitor_add(&h, "/home/myusername", GNOME_VFS_MONITOR_DIRECTORY, MonitorCallback, loop);

    g_main_loop_run(loop);

    gnome_vfs_monitor_cancel(h);

    return 0;

}


Can someone can give me an idea of whether the above should work or
what I would need to do to that simple example to get it working?
Looking at the above I don't really understand how glib would know how
to attach the MonitorCallback to the GMainLoop, which isn't even
running yet (if I created and started another main loop inside the outer loop, would it also generate callbacks?).


thanks,

D