How to get devicetoken of iphone for push notification?

I am trying to use the push notification service provided by apple but I am not able to get the device token r开发者_如何学Cequired for pushing the notification. I am using the following code for retrieving the device token

- (void)application:(UIApplication *)app didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)devToken
{
     const void *devTokenBytes = [devToken bytes];
     NSLog(@"devToken=%@",devTokenBytes);
     //[self alertNotice:@"" withMSG:[NSString stringWithFormat:@"devToken=%@",devToken] cancleButtonTitle:NSLocalizedString(@"OK",@"") otherButtonTitle:@""];
    //self.registered = YES;
    //[self sendProviderDeviceToken:devTokenBytes]; // custom method    
}

- (void)application:(UIApplication *)app didFailToRegisterForRemoteNotificationsWithError:(NSError *)err
{
    NSLog(@"Error in registration. Error: %@", err);
}

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
{   
    for (id key in userInfo)
    {
         NSLog(@"key: %@, value: %@", key, [userInfo objectForKey:key]);
    }    
}

I am registering for the remote notification using the following code

[[UIApplication sharedApplication] 
 registerForRemoteNotificationTypes:
 (UIRemoteNotificationTypeAlert | 
  UIRemoteNotificationTypeBadge | 
  UIRemoteNotificationTypeSound)];

Can anyone help me with this...

I am having the following warning message in the console window

warning: Unable to read symbols for "/Library/MobileSubstrate/MobileSubstrate.dylib" (file not found).

Is it to do something with the jailbroken iphone...

Thanx in advance...

Seems that you have answered it yourself. Jailbroken iPhones will have problems receiving push notifications, as far as i know, but i am not absolutely sure. Were you able to get development/production certificates using this iPhone's UDID for installing apps?