Photo Upload to own wall via iOS Graph API with user's location

I need to post a photo (taken form the camera) in the users facebook wall with the location of the user. Now, the facebook photo object has a field named place:

object containing id and name of Page associated with this location, and a location field containing geographic information such as latitude, longitude, country, and other fields (fields will vary based on geography and availability of information)

Now how do I get the place, attach it with the photo and upload it in the users wall. This is my code for photo upload:

NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                                       resultImage, @"picture",
                                       location, @"place",
                                       nil];

        [appDelegate.facebook requestWithGraphPath:@"me/photos"
                                         andParams:params
                                     andHttpMethod:@"POST"
                                       andDelegate:self];

But, how do I get the location parameter here? Can anyone help? Thanks in advance.

Solution

The place object can only be a Facebook Page Id of the desired location according to this documentation. So, here is how I managed to get user's location while uploading photo.

-(void)fbCheckForPlace:(CLLocation *)location
{
    NSString *centerLocation = [[NSString alloc] initWithFormat:@"%f,%f",
                                location.coordinate.latitude,
                                location.coordinate.longitude];
    NSLog(@"center location is : %@",centerLocation);
    NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                                    @"place",  @"type",
                                    centerLocation, @"center",
                                    @"1000",  @"distance",
                                    nil];
    [centerLocation release];
    [appDelegate.facebook requestWithGraphPath:@"search" andParams:params andDelegate:self];
}

the current location is obtained by calling CLLocation Manager delegate and passed in the above method.

Next, if this request is successful, the place objects are inserted in a mutable array.

NSArray *resultData = [result objectForKey:@"data"];
        for (NSUInteger i=0; i<[resultData count] && i < 5; i++) 
        {
            [self.listOfPlaces addObject:[resultData objectAtIndex:i]];
        }

And then the photo uploading method is fired:

- (void)uploadPhotoWithLocation
{
    NSString *placeId = [[self.listOfPlaces objectAtIndex:0] objectForKey:@"id"];

    params = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                                   self.resultImage, @"picture",
                                   placeId, @"place",
                                   nil];

    [appDelegate.facebook requestWithGraphPath:@"me/photos"
                                     andParams:params
                                 andHttpMethod:@"POST"
                                   andDelegate:self];
}

I have taken the first nearby place of the available check-ins ([self.listOfPlaces objectAtIndex:0]) and now the app can successfully post photos with the users current nearby location.