(Go) Page Through All Contacts

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

Chilkat Go Downloads Go Package for Windows, MacOS, Linux, Alpine Linux, Solaris

    // 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 := chilkat.NewJsonObject()
    success := jsonToken.LoadFile("qa_data/tokens/googleContacts.json")
    if success != true {
        fmt.Println("Failed to load googleContacts.json")
        jsonToken.DisposeJsonObject()
        return
    }

    gAuth := chilkat.NewAuthGoogle()
    gAuth.SetAccessToken(*jsonToken.StringOf("access_token"))

    rest := chilkat.NewRest()

    // Connect using TLS.
    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..
    // ----------------------------------------------

    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 := chilkat.NewStringBuilder()
    sbMaxResults.AppendInt(maxResults)
    sbStartIndex := chilkat.NewStringBuilder()

    loopIteration := 0
    for 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())

        sbResponseBody := chilkat.NewStringBuilder()
        success = rest.FullRequestNoBodySb("GET","/m8/feeds/contacts/default/full",sbResponseBody)
        if success != true {
            fmt.Println(rest.LastErrorText())
            jsonToken.DisposeJsonObject()
            gAuth.DisposeAuthGoogle()
            rest.DisposeRest()
            sbMaxResults.DisposeStringBuilder()
            sbStartIndex.DisposeStringBuilder()
            sbResponseBody.DisposeStringBuilder()
            return
        }

        // A successful response will have a status code equal to 200.
        if rest.ResponseStatusCode() != 200 {
            fmt.Println("response status code = ", rest.ResponseStatusCode())
            fmt.Println("response status text = ", rest.ResponseStatusText())
            fmt.Println("response header: ", rest.ResponseHeader())
            fmt.Println("response body: ", *sbResponseBody.GetAsString())
            jsonToken.DisposeJsonObject()
            gAuth.DisposeAuthGoogle()
            rest.DisposeRest()
            sbMaxResults.DisposeStringBuilder()
            sbStartIndex.DisposeStringBuilder()
            sbResponseBody.DisposeStringBuilder()
            return
        }

        // If the 200 response was received, then the contacts XML is contained
        // in the response body.
        xml := chilkat.NewXml()
        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")
        startIndex2 := xml.GetChildIntValue("openSearch:startIndex")
        itemsPerPage := xml.GetChildIntValue("openSearch:itemsPerPage")
        fmt.Println("totalResults = ", totalResults)
        fmt.Println("startIndex = ", startIndex2)
        fmt.Println("itemsPerPage = ", itemsPerPage)

        // Iterate over each contact.
        numEntries := xml.NumChildrenHavingTag("entry")
        i := 0
        for i < numEntries {
            xml.SetI(i)
            fmt.Println(loopIteration * maxResults + i + 1, " ----")
            fmt.Println("title: ", *xml.GetChildContent("entry[i]|title"))

            idUrl := xml.GetChildContent("entry[i]|id")
            fmt.Println("id: ", *idUrl)

            fullName := xml.ChilkatPath("entry[i]|gd:name|gd:fullName|*")
            if xml.LastMethodSuccess() == true {
                fmt.Println("fullName: ", *fullName)
            }

            emailAddress := xml.ChilkatPath("entry[i]|gd:email|(address)")
            if xml.LastMethodSuccess() == true {
                fmt.Println("email address: ", *emailAddress)
            }

            // Find the photo link and check to see if this contact has a photo.
            xLink := xml.GetChildWithAttr("link","rel","http://schemas.google.com/contacts/2008/rel#photo")
            if xml.LastMethodSuccess() == true {
                // Get the photo etag.
                bHasPhoto := xLink.HasAttribute("gd:etag")
                if bHasPhoto == true {
                    fmt.Println("This contact has a photo.")
                }

                xLink.DisposeXml()
            }

            i = i + 1
        }

        startIndex = startIndex + maxResults
        loopIteration = loopIteration + 1
    }


    jsonToken.DisposeJsonObject()
    gAuth.DisposeAuthGoogle()
    rest.DisposeRest()
    sbMaxResults.DisposeStringBuilder()
    sbStartIndex.DisposeStringBuilder()
    sbResponseBody.DisposeStringBuilder()
    xml.DisposeXml()