(MFC) Google Contacts - Delete a Contact

Demonstrates how to delete a Google Contact.

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..
    // ----------------------------------------------

    // To update a contact, we'll first get the contact information
    // to get the etag.

    // To retrieve the contact, send the following:
    // 	GET /m8/feeds/contacts/default/full/{contactId}
    // 	GData-Version: 3.0

    rest.AddHeader("GData-Version","3.0");

    CkStringBuilder sbPath;
    sbPath.Append("/m8/feeds/contacts/default/full/{contactId}");
    // Get the contact having contactId = "5b6d64980b1ed462"
    int numReplacements = sbPath.Replace("{contactId}","5b6d64980b1ed462");

    CkStringBuilder sbResponseBody;
    success = rest.FullRequestNoBodySb("GET",sbPath.getAsString(),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);

    strOut.append(xml.getXml());
    strOut.append("\r\n");
    strOut.append("-------------------");
    strOut.append("\r\n");

    // Get the etag:
    const char *lastKnownEtag = xml.getAttrValue("gd:etag");
    strOut.append("lastKnownEtag = ");
    strOut.append(lastKnownEtag);
    strOut.append("\r\n");
    strOut.append("-------------------");
    strOut.append("\r\n");

    // To delete, send the following:

    // 	DELETE /m8/feeds/contacts/default/full/{contactId}
    // 	If-Match: {lastKnownEtag}
    // 	GData-Version: 3.0

    rest.ClearAllHeaders();
    rest.AddHeader("If-Match",lastKnownEtag);
    rest.AddHeader("GData-Version","3.0");

    // The sbPath already contains the correct path..
    success = rest.FullRequestNoBodySb("DELETE",sbPath.getAsString(),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");
        strOut.append("request header: ");
        strOut.append(rest.lastRequestHeader());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // The response body for a successful DELETE is empty.
    strOut.append("Response Body: (should be empty)");
    strOut.append("\r\n");
    strOut.append(sbResponseBody.getAsString());
    strOut.append("\r\n");
    strOut.append("Success.");
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }