(Objective-C) Twitter - Get Follower IDs

Demonstrates how to get a list of follower IDs for a Twitter user. If the number of followers is more than can be returned in a single response, this example will use cursors to page through the followers.

Note: Rate limits will prevent a program from paging through huge lists of followers. In general, a maximum of 16 GET requests (pages) can be retrieved in a short period of time.

Chilkat Objective-C Library Downloads MAC OS X (Cocoa) Libs iOS Libs

#import <CkoJsonObject.h>
#import <CkoRest.h>
#import <CkoOAuth1.h>
#import <CkoStringBuilder.h>
#import <NSString.h>

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

// ----------------------------------------------------------------------
// This initial setup, which involves setting the OAuth1 properties and connecting
// to api.twitter.com, is only required once at the beginning.  Once connected, the same
// object instance may be re-used, and if necessary, it will automatically reconnect
// as needed.

// Assume we've previously obtained an access token and saved it to a JSON file..
CkoJsonObject *json = [[CkoJsonObject alloc] init];
BOOL success = [json LoadFile: @"qa_data/tokens/twitter.json"];

CkoRest *rest = [[CkoRest alloc] init];
CkoOAuth1 *oauth1 = [[CkoOAuth1 alloc] init];

oauth1.ConsumerKey = @"TWITTER_CONSUMER_KEY";
oauth1.ConsumerSecret = @"TWITTER_CONSUMER_SECRET";
oauth1.Token = [json StringOf: @"oauth_token"];
oauth1.TokenSecret = [json StringOf: @"oauth_token_secret"];
oauth1.SignatureMethod = @"HMAC-SHA1";
[oauth1 GenNonce: [NSNumber numberWithInt: 16]];

[rest SetAuthOAuth1: oauth1 useQueryParams: NO];

BOOL bAutoReconnect = YES;
success = [rest Connect: @"api.twitter.com" port: [NSNumber numberWithInt: 443] tls: YES autoReconnect: bAutoReconnect];
if (success != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

// This ends the initial setup...
// ----------------------------------------------------------------------

// This Twitter user has about 77.5K followers..
[rest AddQueryParam: @"screen_name" value: @"MarcusMiller959"];

CkoJsonObject *jsonResponse = [[CkoJsonObject alloc] init];
jsonResponse.EmitCompact = NO;

// Get the 1st page of results using a cursor of "-1".
CkoStringBuilder *sbNextCursor = [[CkoStringBuilder alloc] init];
[sbNextCursor SetString: @"-1"];

int pageNum = 1;
BOOL caseSensitive = NO;
BOOL bContinue = YES;
// Get a maximum of 5 pages (of 5000 ids each).
while (bContinue == YES) {

    if ([sbNextCursor ContentsEqual: @"0" caseSensitive: caseSensitive] == YES) {
        // This will cause the loop to exit..
        bContinue = NO;
    }
    else {
        // Adds or replaces the query param.
        [rest AddQueryParam: @"cursor" value: [sbNextCursor GetAsString]];

        // Get the next page of follower IDs
        NSString *resp = [rest FullRequestNoBody: @"GET" uriPath: @"/1.1/followers/ids.json"];
        if (rest.LastMethodSuccess != YES) {
            NSLog(@"%@",rest.LastErrorText);
            return;
        }

        [jsonResponse Load: resp];

        if ([rest.ResponseStatusCode intValue] != 200) {
            NSLog(@"%@",[jsonResponse Emit]);
            return;
        }

        // Show the number of IDs returned in this 
        int numIds = [[jsonResponse SizeOfArray: @"ids"] intValue];
        NSLog(@"%@%d%@%d",@"Page ",pageNum,@", Number of Ids: ",numIds);

        // Show the 1st 10 ids in this page.
        int i = 0;
        while (i < numIds) {
            jsonResponse.I = [NSNumber numberWithInt: i];
            NSLog(@"%@%d%@%@",@"    ",i,@": ",[jsonResponse StringOf: @"ids[i]"]);

            i = i + 1;
            if (i > 10) {
                // Force the loop to exit.
                i = numIds;
            }

        }

        pageNum = pageNum + 1;
        if (pageNum > 5) {
            bContinue = NO;
        }
        else {
            [sbNextCursor SetString: [jsonResponse StringOf: @"next_cursor_str"]];
        }

    }

}

// A successful JSON response for the 1st page looks like this:

// 	{
// 	  "ids": [
// 	    3140496044,
// 	    793204773751324672,
// 	    789951187781050369,
// 	    763520773587922945,
// 	    ...
// 	    15031286,
// 	    2668251246,
// 	    3751659443
// 	  ],
// 	  "next_cursor": 1531680438812851153,
// 	  "next_cursor_str": "1531680438812851153",
// 	  "previous_cursor": 0,
// 	  "previous_cursor_str": "0"
// 	}

// The output of this program looks like this:

// 	Page 1, Number of Ids: 5000
// 	    0: 931953350
// 	    1: 786708055
// 	    2: 560845700
// 	    3: 3140496044
// 	    4: 793204773751324672
// 	    5: 789951187781050369
// 	    6: 763520773587922945
// 	    7: 793143274059988992
// 	    8: 793139683412762624
// 	    9: 1588222783
// 	    10: 703821370778451968
// 	Page 2, Number of Ids: 5000
// 	    0: 15031286
// 	    1: 2668251246
// 	    2: 3751659443
// 	    3: 3324584493
// 	    4: 2440214809
// 	    5: 1322335441
// 	    6: 4439178393
// 	    7: 4911573711
// 	    8: 720792880080560128
// 	    9: 720805087124267008
// 	    10: 172926330
// 	Page 3, Number of Ids: 5000
// 	    0: 93867176
// 	    1: 2992946183
// 	    2: 2825296077
// 	    3: 3784572861
// 	    4: 2150051321
// 	    5: 2460881603
// 	    6: 4128849341
// 	    7: 2234697931
// 	    8: 2379418164
// 	    9: 3425171542
// 	    10: 325759186
// 	Page 4, Number of Ids: 5000
// 	    0: 22793412
// 	    1: 3347750489
// 	    2: 316923043
// 	    3: 2481719196
// 	    4: 3363591905
// 	    5: 3238116492
// 	    6: 58467130
// 	    7: 3015182362
// 	    8: 2985342719
// 	    9: 3095965720
// 	    10: 17505957
// 	Page 5, Number of Ids: 5000
// 	    0: 2541434684
// 	    1: 140022957
// 	    2: 134845054
// 	    3: 772810508
// 	    4: 16979294
// 	    5: 2320540225
// 	    6: 105439442
// 	    7: 2796744529
// 	    8: 251128801
// 	    9: 350229758
// 	    10: 2683994716
//