(C++) Paging User Photos with Cursor

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

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#include <CkOAuth2.h>
#include <CkRest.h>
#include <CkJsonObject.h>

void ChilkatSample(void)
    {
    // 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
    CkOAuth2 oauth2;
    oauth2.put_AccessToken("FACEBOOK-ACCESS-TOKEN");

    CkRest rest;

    // Connect to Facebook.
    bool success = rest.Connect("graph.facebook.com",443,true,true);
    if (success != true) {
        std::cout << rest.lastErrorText() << "\r\n";
        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","uploaded");

    // We could limit the number of photos per page using the "limit" field.
    rest.AddQueryParam("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.
    const char *responseJson = rest.fullRequestNoBody("GET","/v2.7/me/photos");
    if (rest.get_LastMethodSuccess() != true) {
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    CkJsonObject json;
    json.put_EmitCompact(false);
    json.Load(responseJson);
    std::cout << json.emit() << "\r\n";

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

    // Get the "after" cursor.
    const char *afterCursor = json.stringOf("paging.cursors.after");
    while (json.get_LastMethodSuccess() == true) {

        std::cout << "after cursor: " << afterCursor << "\r\n";

        // 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","uploaded");
        rest.AddQueryParam("limit","20");
        rest.AddQueryParam("after",afterCursor);

        responseJson = rest.fullRequestNoBody("GET","/v2.7/me/photos");
        if (rest.get_LastMethodSuccess() != true) {
            std::cout << rest.lastErrorText() << "\r\n";
            return;
        }

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

        std::cout << json.emit() << "\r\n";

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

    std::cout << "No more pages of photos." << "\r\n";
    }