(MFC) Page Through All Contacts

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

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkJsonObject.h>
#include <CkAuthGoogle.h>
#include <CkRest.h>
#include <CkStringBuilder.h>
#include <CkXml.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // 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

    CkJsonObject jsonToken;
    bool success = jsonToken.LoadFile("qa_data/tokens/googleContacts.json");
    if (success != true) {
        strOut.append("Failed to load googleContacts.json");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    CkAuthGoogle gAuth;
    gAuth.put_AccessToken(jsonToken.stringOf("access_token"));

    CkRest rest;

    // Connect using TLS.
    bool bAutoReconnect = true;
    success = rest.Connect("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

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

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

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

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

        CkStringBuilder sbResponseBody;
        success = rest.FullRequestNoBodySb("GET","/m8/feeds/contacts/default/full",sbResponseBody);
        if (success != true) {
            strOut.append(rest.lastErrorText());
            strOut.append("\r\n");
            SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
            return;
        }

        // A successful response will have a status code equal to 200.
        if (rest.get_ResponseStatusCode() != 200) {
            strOut.append("response status code = ");
            strOut.appendInt(rest.get_ResponseStatusCode());
            strOut.append("\r\n");
            strOut.append("response status text = ");
            strOut.append(rest.responseStatusText());
            strOut.append("\r\n");
            strOut.append("response header: ");
            strOut.append(rest.responseHeader());
            strOut.append("\r\n");
            strOut.append("response body: ");
            strOut.append(sbResponseBody.getAsString());
            strOut.append("\r\n");
            SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
            return;
        }

        // If the 200 response was received, then the contacts XML is contained
        // in the response body.
        CkXml 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("openSearch:totalResults");
        int startIndex2 = xml.GetChildIntValue("openSearch:startIndex");
        int itemsPerPage = xml.GetChildIntValue("openSearch:itemsPerPage");
        strOut.append("totalResults = ");
        strOut.appendInt(totalResults);
        strOut.append("\r\n");
        strOut.append("startIndex = ");
        strOut.appendInt(startIndex2);
        strOut.append("\r\n");
        strOut.append("itemsPerPage = ");
        strOut.appendInt(itemsPerPage);
        strOut.append("\r\n");

        // Iterate over each contact.
        int numEntries = xml.NumChildrenHavingTag("entry");
        int i = 0;
        while (i < numEntries) {
            xml.put_I(i);
            strOut.appendInt(loopIteration * maxResults + i + 1);
            strOut.append(" ----");
            strOut.append("\r\n");
            strOut.append("title: ");
            strOut.append(xml.getChildContent("entry[i]|title"));
            strOut.append("\r\n");

            const char *idUrl = xml.getChildContent("entry[i]|id");
            strOut.append("id: ");
            strOut.append(idUrl);
            strOut.append("\r\n");

            const char *fullName = xml.chilkatPath("entry[i]|gd:name|gd:fullName|*");
            if (xml.get_LastMethodSuccess() == true) {
                strOut.append("fullName: ");
                strOut.append(fullName);
                strOut.append("\r\n");
            }

            const char *emailAddress = xml.chilkatPath("entry[i]|gd:email|(address)");
            if (xml.get_LastMethodSuccess() == true) {
                strOut.append("email address: ");
                strOut.append(emailAddress);
                strOut.append("\r\n");
            }

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

                delete xLink;
            }

            i = i + 1;
        }

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



    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }