(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.

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#include <C_CkJsonObject.h>
#include <C_CkRest.h>
#include <C_CkOAuth1.h>
#include <C_CkStringBuilder.h>

void ChilkatSample(void)
    {
    HCkJsonObject json;
    BOOL success;
    HCkRest rest;
    HCkOAuth1 oauth1;
    BOOL bAutoReconnect;
    HCkJsonObject jsonResponse;
    HCkStringBuilder sbNextCursor;
    int pageNum;
    BOOL caseSensitive;
    BOOL bContinue;
    const char *resp;
    int numIds;
    int i;

    // 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..
    json = CkJsonObject_Create();
    success = CkJsonObject_LoadFile(json,"qa_data/tokens/twitter.json");

    rest = CkRest_Create();
    oauth1 = CkOAuth1_Create();

    CkOAuth1_putConsumerKey(oauth1,"TWITTER_CONSUMER_KEY");
    CkOAuth1_putConsumerSecret(oauth1,"TWITTER_CONSUMER_SECRET");
    CkOAuth1_putToken(oauth1,CkJsonObject_stringOf(json,"oauth_token"));
    CkOAuth1_putTokenSecret(oauth1,CkJsonObject_stringOf(json,"oauth_token_secret"));
    CkOAuth1_putSignatureMethod(oauth1,"HMAC-SHA1");
    CkOAuth1_GenNonce(oauth1,16);

    CkRest_SetAuthOAuth1(rest,oauth1,FALSE);

    bAutoReconnect = TRUE;
    success = CkRest_Connect(rest,"api.twitter.com",443,TRUE,bAutoReconnect);
    if (success != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkJsonObject_Dispose(json);
        CkRest_Dispose(rest);
        CkOAuth1_Dispose(oauth1);
        return;
    }

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

    // This Twitter user has about 77.5K followers..
    CkRest_AddQueryParam(rest,"screen_name","MarcusMiller959");

    jsonResponse = CkJsonObject_Create();
    CkJsonObject_putEmitCompact(jsonResponse,FALSE);

    // Get the 1st page of results using a cursor of "-1".
    sbNextCursor = CkStringBuilder_Create();
    CkStringBuilder_SetString(sbNextCursor,"-1");

    pageNum = 1;
    caseSensitive = FALSE;
    bContinue = TRUE;
    // Get a maximum of 5 pages (of 5000 ids each).
    while (bContinue == TRUE) {

        if (CkStringBuilder_ContentsEqual(sbNextCursor,"0",caseSensitive) == TRUE) {
            // This will cause the loop to exit..
            bContinue = FALSE;
        }
        else {
            // Adds or replaces the query param.
            CkRest_AddQueryParam(rest,"cursor",CkStringBuilder_getAsString(sbNextCursor));

            // Get the next page of follower IDs
            resp = CkRest_fullRequestNoBody(rest,"GET","/1.1/followers/ids.json");
            if (CkRest_getLastMethodSuccess(rest) != TRUE) {
                printf("%s\n",CkRest_lastErrorText(rest));
                CkJsonObject_Dispose(json);
                CkRest_Dispose(rest);
                CkOAuth1_Dispose(oauth1);
                CkJsonObject_Dispose(jsonResponse);
                CkStringBuilder_Dispose(sbNextCursor);
                return;
            }

            CkJsonObject_Load(jsonResponse,resp);

            if (CkRest_getResponseStatusCode(rest) != 200) {
                printf("%s\n",CkJsonObject_emit(jsonResponse));
                CkJsonObject_Dispose(json);
                CkRest_Dispose(rest);
                CkOAuth1_Dispose(oauth1);
                CkJsonObject_Dispose(jsonResponse);
                CkStringBuilder_Dispose(sbNextCursor);
                return;
            }

            // Show the number of IDs returned in this 
            numIds = CkJsonObject_SizeOfArray(jsonResponse,"ids");
            printf("Page %d, Number of Ids: %d\n",pageNum,numIds);

            // Show the 1st 10 ids in this page.
            i = 0;
            while (i < numIds) {
                CkJsonObject_putI(jsonResponse,i);
                printf("    %d: %s\n",i,CkJsonObject_stringOf(jsonResponse,"ids[i]"));

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

            }

            pageNum = pageNum + 1;
            if (pageNum > 5) {
                bContinue = FALSE;
            }
            else {
                CkStringBuilder_SetString(sbNextCursor,CkJsonObject_stringOf(jsonResponse,"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
    // 


    CkJsonObject_Dispose(json);
    CkRest_Dispose(rest);
    CkOAuth1_Dispose(oauth1);
    CkJsonObject_Dispose(jsonResponse);
    CkStringBuilder_Dispose(sbNextCursor);

    }