(C) Paging User Photos with Cursor

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

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#include <C_CkOAuth2.h>
#include <C_CkRest.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    HCkOAuth2 oauth2;
    HCkRest rest;
    BOOL success;
    const char *responseJson;
    HCkJsonObject json;
    const char *afterCursor;

    // 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
    oauth2 = CkOAuth2_Create();
    CkOAuth2_putAccessToken(oauth2,"FACEBOOK-ACCESS-TOKEN");

    rest = CkRest_Create();

    // Connect to Facebook.
    success = CkRest_Connect(rest,"graph.facebook.com",443,TRUE,TRUE);
    if (success != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkOAuth2_Dispose(oauth2);
        CkRest_Dispose(rest);
        return;
    }

    // Provide the authentication credentials (i.e. the access key)
    CkRest_SetAuthOAuth2(rest,oauth2);

    // Indicate that we only want the photos the user has personally uploaded.
    CkRest_AddQueryParam(rest,"type","uploaded");

    // We could limit the number of photos per page using the "limit" field.
    CkRest_AddQueryParam(rest,"limit","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.
    responseJson = CkRest_fullRequestNoBody(rest,"GET","/v2.7/me/photos");
    if (CkRest_getLastMethodSuccess(rest) != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkOAuth2_Dispose(oauth2);
        CkRest_Dispose(rest);
        return;
    }

    json = CkJsonObject_Create();
    CkJsonObject_putEmitCompact(json,FALSE);
    CkJsonObject_Load(json,responseJson);
    printf("%s\n",CkJsonObject_emit(json));

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

    // Get the "after" cursor.
    afterCursor = CkJsonObject_stringOf(json,"paging.cursors.after");
    while (CkJsonObject_getLastMethodSuccess(json) == TRUE) {

        printf("after cursor: %s\n",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.
        CkRest_ClearAllQueryParams(rest);
        CkRest_AddQueryParam(rest,"type","uploaded");
        CkRest_AddQueryParam(rest,"limit","20");
        CkRest_AddQueryParam(rest,"after",afterCursor);

        responseJson = CkRest_fullRequestNoBody(rest,"GET","/v2.7/me/photos");
        if (CkRest_getLastMethodSuccess(rest) != TRUE) {
            printf("%s\n",CkRest_lastErrorText(rest));
            CkOAuth2_Dispose(oauth2);
            CkRest_Dispose(rest);
            CkJsonObject_Dispose(json);
            return;
        }

        CkJsonObject_Load(json,responseJson);
        // See Parsing the Facebook User Photos for code showing how to parse the JSON photos content.

        printf("%s\n",CkJsonObject_emit(json));

        // Get the cursor for the next page.
        afterCursor = CkJsonObject_stringOf(json,"paging.cursors.after");
    }

    printf("No more pages of photos.\n");


    CkOAuth2_Dispose(oauth2);
    CkRest_Dispose(rest);
    CkJsonObject_Dispose(json);

    }