(Delphi ActiveX) Find Contact Having Email Address

Demonstrates how to fetch the Google Contact for a given email address.

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
jsonToken: TChilkatJsonObject;
success: Integer;
gAuth: TChilkatAuthGoogle;
rest: TChilkatRest;
bAutoReconnect: Integer;
emailAddressToFind: WideString;
sbResponseBody: TChilkatStringBuilder;
xml: TChilkatXml;
totalResults: Integer;
startIndex: Integer;
itemsPerPage: Integer;
fac: TCkFileAccess;
numEntries: Integer;
i: Integer;
idUrl: WideString;
contactId: WideString;
fullName: WideString;
emailAddress: WideString;

begin
// 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 := TChilkatJsonObject.Create(Self);
success := jsonToken.LoadFile('qa_data/tokens/googleContacts.json');
if (success <> 1) then
  begin
    Memo1.Lines.Add('Failed to load googleContacts.json');
    Exit;
  end;

gAuth := TChilkatAuthGoogle.Create(Self);
gAuth.AccessToken := jsonToken.StringOf('access_token');

rest := TChilkatRest.Create(Self);

// Connect using TLS.
bAutoReconnect := 1;
success := rest.Connect('www.google.com',443,1,bAutoReconnect);

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

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

// To retrieve the contacts, we need to send the following:

// 	GET /m8/feeds/contacts/default/full?q=<emailAddress>
// 	GData-Version: 3.0

// Get the contact (or contacts) with this email address:
emailAddressToFind := 'admin@chilkatsoft.com';

rest.AddHeader('GData-Version','3.0');
rest.AddQueryParam('q',emailAddressToFind);

sbResponseBody := TChilkatStringBuilder.Create(Self);
success := rest.FullRequestNoBodySb('GET','/m8/feeds/contacts/default/full',sbResponseBody.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

// A successful response will have a status code equal to 200.
if (rest.ResponseStatusCode <> 200) then
  begin
    Memo1.Lines.Add('response status code = ' + IntToStr(rest.ResponseStatusCode));
    Memo1.Lines.Add('response status text = ' + rest.ResponseStatusText);
    Memo1.Lines.Add('response header: ' + rest.ResponseHeader);
    Memo1.Lines.Add('response body: ' + sbResponseBody.GetAsString());
    Exit;
  end;

// If the 200 response was received, then the contacts XML is contained
// in the response body.
xml := TChilkatXml.Create(Self);
xml.LoadSb(sbResponseBody.ControlInterface,0);

// See below for a sample response body.
xml.SaveXml('qa_output/google_contacts.xml');

// 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');
startIndex := xml.GetChildIntValue('openSearch:startIndex');
itemsPerPage := xml.GetChildIntValue('openSearch:itemsPerPage');
Memo1.Lines.Add('totalResults = ' + IntToStr(totalResults));
Memo1.Lines.Add('startIndex = ' + IntToStr(startIndex));
Memo1.Lines.Add('itemsPerPage = ' + IntToStr(itemsPerPage));

// We'll borrow a method from FileAccess to get the contactId from the URL string (see the code in the while loop)
fac := TCkFileAccess.Create(Self);

// Iterate over each contact.
numEntries := xml.NumChildrenHavingTag('entry');
i := 0;
while i < numEntries do
  begin
    xml.I := i;
    Memo1.Lines.Add(IntToStr(i + 1) + ' ----');
    Memo1.Lines.Add('title: ' + xml.GetChildContent('entry[i]|title'));

    // The entry "id" child contains a URL having this format:
    // <id>http://www.google.com/m8/feeds/contacts/{userEmail}/base/{contactId}</id>
    // Let's get the URL and parse the contactId from it..
    idUrl := xml.GetChildContent('entry[i]|id');
    Memo1.Lines.Add('id: ' + idUrl);

    // Use the parsing ability of GetFileName to get the contactId
    contactId := fac.GetFileName(idUrl);
    Memo1.Lines.Add('contactId: ' + contactId);

    fullName := xml.ChilkatPath('entry[i]|gd:name|gd:fullName|*');
    if (xml.LastMethodSuccess = 1) then
      begin
        Memo1.Lines.Add('fullName: ' + fullName);
      end;

    emailAddress := xml.ChilkatPath('entry[i]|gd:email|(address)');
    if (xml.LastMethodSuccess = 1) then
      begin
        Memo1.Lines.Add('email address: ' + emailAddress);
      end;

    i := i + 1;
  end;
end;