(Unicode C++) Page Through All Contacts

Demonstrates how to page through the entire list of Google Contacts.

Chilkat C/C++ Library Downloads
MS Visual C/C++ Linux/CentOS C/C++ Alpine Linux C/C++ MAC OS X C/C++	armhf/aarch64 C/C++ C++ Builder iOS C/C++ Android C/C++	Solaris C/C++ MinGW C/C++

#include <CkJsonObjectW.h>
#include <CkAuthGoogleW.h>
#include <CkRestW.h>
#include <CkStringBuilderW.h>
#include <CkXmlW.h>

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

    // --------------------------------------------------------------------------------------------------------
    // Note: The code for setting up the Chilkat REST object and making the initial connection can be done once.
    // Once connected, the REST object may be re-used for many REST API calls.
    // (It's a good idea to put the connection setup code in a separate function/subroutine.)
    // --------------------------------------------------------------------------------------------------------

    // It is assumed we previously obtained an OAuth2 access token.
    // This example loads the JSON access token file 
    // saved by this example: Get Google Contacts OAuth2 Access Token

    CkJsonObjectW jsonToken;
    bool success = jsonToken.LoadFile(L"qa_data/tokens/googleContacts.json");
    if (success != true) {
        wprintf(L"Failed to load googleContacts.json\n");
        return;
    }

    CkAuthGoogleW gAuth;
    gAuth.put_AccessToken(jsonToken.stringOf(L"access_token"));

    CkRestW rest;

    // Connect using TLS.
    bool bAutoReconnect = true;
    success = rest.Connect(L"www.google.com",443,true,bAutoReconnect);

    // Provide the authentication credentials (i.e. the access token)
    rest.SetAuthGoogle(gAuth);

    // ----------------------------------------------
    // OK, the REST connection setup is completed..
    // ----------------------------------------------

    int startIndex = 1;
    int maxResults = 25;
    // The totalResults will get updated with the correct value in the 1st loop iteration..
    int totalResults = 100;
    // To retrieve the contacts in pages of 25 each, we need to send the following for each page.

    // 	GET /m8/feeds/contacts/default/full?max-results=25&start-index=<startIndex>
    // 	GData-Version: 3.0

    CkStringBuilderW sbMaxResults;
    sbMaxResults.AppendInt(maxResults);
    CkStringBuilderW sbStartIndex;

    int loopIteration = 0;
    while (startIndex <= totalResults) {

        sbStartIndex.Clear();
        sbStartIndex.AppendInt(startIndex);

        rest.ClearAllHeaders();
        rest.ClearAllQueryParams();
        rest.AddHeader(L"GData-Version",L"3.0");
        rest.AddQueryParam(L"start-index",sbStartIndex.getAsString());
        rest.AddQueryParam(L"max-results",sbMaxResults.getAsString());

        CkStringBuilderW sbResponseBody;
        success = rest.FullRequestNoBodySb(L"GET",L"/m8/feeds/contacts/default/full",sbResponseBody);
        if (success != true) {
            wprintf(L"%s\n",rest.lastErrorText());
            return;
        }

        // A successful response will have a status code equal to 200.
        if (rest.get_ResponseStatusCode() != 200) {
            wprintf(L"response status code = %d\n",rest.get_ResponseStatusCode());
            wprintf(L"response status text = %s\n",rest.responseStatusText());
            wprintf(L"response header: %s\n",rest.responseHeader());
            wprintf(L"response body: %s\n",sbResponseBody.getAsString());
            return;
        }

        // If the 200 response was received, then the contacts XML is contained
        // in the response body.
        CkXmlW xml;
        xml.LoadSb(sbResponseBody,false);

        // Now let's parse the XML...

        // Get the the total number of results, the start index, and the items per page.
        // We'll likely NOT get the full list, but will instead get the 1st page.
        totalResults = xml.GetChildIntValue(L"openSearch:totalResults");
        int startIndex2 = xml.GetChildIntValue(L"openSearch:startIndex");
        int itemsPerPage = xml.GetChildIntValue(L"openSearch:itemsPerPage");
        wprintf(L"totalResults = %d\n",totalResults);
        wprintf(L"startIndex = %d\n",startIndex2);
        wprintf(L"itemsPerPage = %d\n",itemsPerPage);

        // Iterate over each contact.
        int numEntries = xml.NumChildrenHavingTag(L"entry");
        int i = 0;
        while (i < numEntries) {
            xml.put_I(i);
            wprintf(L"%d ----\n",loopIteration * maxResults + i + 1);
            wprintf(L"title: %s\n",xml.getChildContent(L"entry[i]|title"));

            const wchar_t *idUrl = xml.getChildContent(L"entry[i]|id");
            wprintf(L"id: %s\n",idUrl);

            const wchar_t *fullName = xml.chilkatPath(L"entry[i]|gd:name|gd:fullName|*");
            if (xml.get_LastMethodSuccess() == true) {
                wprintf(L"fullName: %s\n",fullName);
            }

            const wchar_t *emailAddress = xml.chilkatPath(L"entry[i]|gd:email|(address)");
            if (xml.get_LastMethodSuccess() == true) {
                wprintf(L"email address: %s\n",emailAddress);
            }

            // Find the photo link and check to see if this contact has a photo.
            CkXmlW *xLink = xml.GetChildWithAttr(L"link",L"rel",L"http://schemas.google.com/contacts/2008/rel#photo");
            if (xml.get_LastMethodSuccess() == true) {
                // Get the photo etag.
                bool bHasPhoto = xLink->HasAttribute(L"gd:etag");
                if (bHasPhoto == true) {
                    wprintf(L"This contact has a photo.\n");
                }

                delete xLink;
            }

            i = i + 1;
        }

        startIndex = startIndex + maxResults;
        loopIteration = loopIteration + 1;
    }
    }