(Unicode C) Page Through All Contacts

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

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#include <C_CkJsonObjectW.h>
#include <C_CkAuthGoogleW.h>
#include <C_CkRestW.h>
#include <C_CkStringBuilderW.h>
#include <C_CkXmlW.h>

void ChilkatSample(void)
    {
    HCkJsonObjectW jsonToken;
    BOOL success;
    HCkAuthGoogleW gAuth;
    HCkRestW rest;
    BOOL bAutoReconnect;
    int startIndex;
    int maxResults;
    int totalResults;
    HCkStringBuilderW sbMaxResults;
    HCkStringBuilderW sbStartIndex;
    int loopIteration;
    HCkStringBuilderW sbResponseBody;
    HCkXmlW xml;
    int startIndex2;
    int itemsPerPage;
    int numEntries;
    int i;
    const wchar_t *idUrl;
    const wchar_t *fullName;
    const wchar_t *emailAddress;
    HCkXmlW xLink;
    BOOL bHasPhoto;

    // 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

    jsonToken = CkJsonObjectW_Create();
    success = CkJsonObjectW_LoadFile(jsonToken,L"qa_data/tokens/googleContacts.json");
    if (success != TRUE) {
        wprintf(L"Failed to load googleContacts.json\n");
        CkJsonObjectW_Dispose(jsonToken);
        return;
    }

    gAuth = CkAuthGoogleW_Create();
    CkAuthGoogleW_putAccessToken(gAuth,CkJsonObjectW_stringOf(jsonToken,L"access_token"));

    rest = CkRestW_Create();

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

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

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

    startIndex = 1;
    maxResults = 25;
    // The totalResults will get updated with the correct value in the 1st loop iteration..
    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

    sbMaxResults = CkStringBuilderW_Create();
    CkStringBuilderW_AppendInt(sbMaxResults,maxResults);
    sbStartIndex = CkStringBuilderW_Create();

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

        CkStringBuilderW_Clear(sbStartIndex);
        CkStringBuilderW_AppendInt(sbStartIndex,startIndex);

        CkRestW_ClearAllHeaders(rest);
        CkRestW_ClearAllQueryParams(rest);
        CkRestW_AddHeader(rest,L"GData-Version",L"3.0");
        CkRestW_AddQueryParam(rest,L"start-index",CkStringBuilderW_getAsString(sbStartIndex));
        CkRestW_AddQueryParam(rest,L"max-results",CkStringBuilderW_getAsString(sbMaxResults));

        sbResponseBody = CkStringBuilderW_Create();
        success = CkRestW_FullRequestNoBodySb(rest,L"GET",L"/m8/feeds/contacts/default/full",sbResponseBody);
        if (success != TRUE) {
            wprintf(L"%s\n",CkRestW_lastErrorText(rest));
            CkJsonObjectW_Dispose(jsonToken);
            CkAuthGoogleW_Dispose(gAuth);
            CkRestW_Dispose(rest);
            CkStringBuilderW_Dispose(sbMaxResults);
            CkStringBuilderW_Dispose(sbStartIndex);
            CkStringBuilderW_Dispose(sbResponseBody);
            return;
        }

        // A successful response will have a status code equal to 200.
        if (CkRestW_getResponseStatusCode(rest) != 200) {
            wprintf(L"response status code = %d\n",CkRestW_getResponseStatusCode(rest));
            wprintf(L"response status text = %s\n",CkRestW_responseStatusText(rest));
            wprintf(L"response header: %s\n",CkRestW_responseHeader(rest));
            wprintf(L"response body: %s\n",CkStringBuilderW_getAsString(sbResponseBody));
            CkJsonObjectW_Dispose(jsonToken);
            CkAuthGoogleW_Dispose(gAuth);
            CkRestW_Dispose(rest);
            CkStringBuilderW_Dispose(sbMaxResults);
            CkStringBuilderW_Dispose(sbStartIndex);
            CkStringBuilderW_Dispose(sbResponseBody);
            return;
        }

        // If the 200 response was received, then the contacts XML is contained
        // in the response body.
        xml = CkXmlW_Create();
        CkXmlW_LoadSb(xml,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 = CkXmlW_GetChildIntValue(xml,L"openSearch:totalResults");
        startIndex2 = CkXmlW_GetChildIntValue(xml,L"openSearch:startIndex");
        itemsPerPage = CkXmlW_GetChildIntValue(xml,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.
        numEntries = CkXmlW_NumChildrenHavingTag(xml,L"entry");
        i = 0;
        while (i < numEntries) {
            CkXmlW_putI(xml,i);
            wprintf(L"%d ----\n",loopIteration * maxResults + i + 1);
            wprintf(L"title: %s\n",CkXmlW_getChildContent(xml,L"entry[i]|title"));

            idUrl = CkXmlW_getChildContent(xml,L"entry[i]|id");
            wprintf(L"id: %s\n",idUrl);

            fullName = CkXmlW_chilkatPath(xml,L"entry[i]|gd:name|gd:fullName|*");
            if (CkXmlW_getLastMethodSuccess(xml) == TRUE) {
                wprintf(L"fullName: %s\n",fullName);
            }

            emailAddress = CkXmlW_chilkatPath(xml,L"entry[i]|gd:email|(address)");
            if (CkXmlW_getLastMethodSuccess(xml) == TRUE) {
                wprintf(L"email address: %s\n",emailAddress);
            }

            // Find the photo link and check to see if this contact has a photo.
            xLink = CkXmlW_GetChildWithAttr(xml,L"link",L"rel",L"http://schemas.google.com/contacts/2008/rel#photo");
            if (CkXmlW_getLastMethodSuccess(xml) == TRUE) {
                // Get the photo etag.
                bHasPhoto = CkXmlW_HasAttribute(xLink,L"gd:etag");
                if (bHasPhoto == TRUE) {
                    wprintf(L"This contact has a photo.\n");
                }

                CkXmlW_Dispose(xLink);
            }

            i = i + 1;
        }

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



    CkJsonObjectW_Dispose(jsonToken);
    CkAuthGoogleW_Dispose(gAuth);
    CkRestW_Dispose(rest);
    CkStringBuilderW_Dispose(sbMaxResults);
    CkStringBuilderW_Dispose(sbStartIndex);
    CkStringBuilderW_Dispose(sbResponseBody);
    CkXmlW_Dispose(xml);

    }