[maemo-developers] calling a Qt dbus method from a HILDON desktop widget

[From: ibrahim]

greetings;

I was creating an application with Qt that exposes a dbus service. the 
service returns its output  as a QStringList. I tested this dbus service 
with a client written in Qt and it worked perfectly.

I wanted to create a Desktop widget that can consume this dbus service. 
I created a normal C file that calls the dbus service - just as POC to 
see if it works by modifying some code i found (a C file that gets the 
imei , written by mr.faheem 
http://talk.maemo.org/showpost.php?p=371496&postcount=45)
my code is :

#include <stdlib.h>
#include <glib.h>
#include <glib/gprintf.h>
#include <dbus/dbus-glib.h>
#include <string.h>
#include <stdio.h>
static GList* ptimes_list = NULL;
int fn() {
DBusGConnection *conn;
    GError *error = NULL;

    conn = dbus_g_bus_get (DBUS_BUS_SYSTEM, &error);
    if (!conn) {
            g_printerr ("Error: %s\n", error->message);
            g_error_free (error);
            return 0;
    }
    DBusGProxy *proxy = NULL;
    /* replaced the cinstants with values from my dbus interface */
    proxy = dbus_g_proxy_new_for_name(conn, SERVICE_NAME,PATH ,INTERFACE);
             
    if (!proxy) {
    printf("No proxy, dbus_g_proxy_new_for_name() failed \n");
        return 0;
    }
   
        if (!dbus_g_proxy_call(proxy,"mthod_name", &error,my_list) )
        {
            /* dbus_g_proxy_call failed */
            printf("dbus_g_proxy_call(proxy,method, &error,myList) 
returned FALSE \n");
            return 0;
        }
        if (!my_list) {
            /* output list is empty */
            printf("my_list) glist is still NULL \n");
            return 0;
        }
        g_object_unref(proxy);
    char[10] element = (char*) g_list_nth_data(my_list),0);   
    printf("the value of the fajr first is %s \n",element);
    return 1;
}
the program fails at this point: proxy = dbus_g_proxy_new_for_name(conn, 
SERVICE_NAME,PATH ,INTERFACE);
and my application stops.

I wonder what is wrong with the way I called my DBus service . Any help 
is appreciated!