(Objective-C) Paging User Photos with Cursor

Demonstrates how to iterate over the pages of user photos using a cursor.

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#import <CkoOAuth2.h>
#import <CkoRest.h>
#import <NSString.h>
#import <CkoJsonObject.h>

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// This example assumes a previously obtained an access token
CkoOAuth2 *oauth2 = [[CkoOAuth2 alloc] init];
oauth2.AccessToken = @"FACEBOOK-ACCESS-TOKEN";

CkoRest *rest = [[CkoRest alloc] init];

// Connect to Facebook.
BOOL success = [rest Connect: @"graph.facebook.com" port: [NSNumber numberWithInt: 443] tls: YES autoReconnect: YES];
if (success != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

// Provide the authentication credentials (i.e. the access key)
[rest SetAuthOAuth2: oauth2];

// Indicate that we only want the photos the user has personally uploaded.
[rest AddQueryParam: @"type" value: @"uploaded"];

// We could limit the number of photos per page using the "limit" field.
[rest AddQueryParam: @"limit" value: @"20"];

// Get the 1st page of photos. (Not the actual image data, but the information about each photo.)
// See https://developers.facebook.com/docs/graph-api/reference/user/photos/ for more information.
NSString *responseJson = [rest FullRequestNoBody: @"GET" uriPath: @"/v2.7/me/photos"];
if (rest.LastMethodSuccess != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

CkoJsonObject *json = [[CkoJsonObject alloc] init];
json.EmitCompact = NO;
[json Load: responseJson];
NSLog(@"%@",[json Emit]);

// 
// See Parsing the Facebook User Photos for code showing how to parse the JSON photos content.
// 

// Get the "after" cursor.
NSString *afterCursor = [json StringOf: @"paging.cursors.after"];
while (json.LastMethodSuccess == YES) {

    NSLog(@"%@%@",@"after cursor: ",afterCursor);

    // Prepare for getting the next page of photos.
    // We can continue using the same REST object.
    // If already connected, we'll continue using the existing connection.
    // Otherwise, a new connection will automatically be made if needed.
    [rest ClearAllQueryParams];
    [rest AddQueryParam: @"type" value: @"uploaded"];
    [rest AddQueryParam: @"limit" value: @"20"];
    [rest AddQueryParam: @"after" value: afterCursor];

    responseJson = [rest FullRequestNoBody: @"GET" uriPath: @"/v2.7/me/photos"];
    if (rest.LastMethodSuccess != YES) {
        NSLog(@"%@",rest.LastErrorText);
        return;
    }

    [json Load: responseJson];
    // See Parsing the Facebook User Photos for code showing how to parse the JSON photos content.

    NSLog(@"%@",[json Emit]);

    // Get the cursor for the next page.
    afterCursor = [json StringOf: @"paging.cursors.after"];
}

NSLog(@"%@",@"No more pages of photos.");