Pascal (Lazarus/Delphi)

Find Contact Having Email Address

See more Google APIs Examples

Demonstrates how to fetch the Google Contact for a given email address. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.AuthGoogle,
  Chilkat.FileAccess,
  Chilkat.Rest,
  Chilkat.JsonObject,
  Chilkat.StringBuilder,
  Chilkat.Xml;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  jsonToken: TJsonObject;
  gAuth: TAuthGoogle;
  rest: TRest;
  bAutoReconnect: Boolean;
  emailAddressToFind: string;
  sbResponseBody: TStringBuilder;
  xml: TXml;
  totalResults: Integer;
  startIndex: Integer;
  itemsPerPage: Integer;
  fac: TFileAccess;
  numEntries: Integer;
  i: Integer;
  idUrl: string;
  contactId: string;
  fullName: string;
  emailAddress: string;

begin
  success := False;

  //  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 := TJsonObject.Create;
  success := jsonToken.LoadFile('qa_data/tokens/googleContacts.json');
  if (success <> True) then
    begin
      WriteLn('Failed to load googleContacts.json');
      Exit;
    end;

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

  rest := TRest.Create;

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

  //  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 := TStringBuilder.Create;
  success := rest.FullRequestNoBodySb('GET','/m8/feeds/contacts/default/full',sbResponseBody);
  if (success <> True) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

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

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

  //  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');
  WriteLn('totalResults = ' + totalResults);
  WriteLn('startIndex = ' + startIndex);
  WriteLn('itemsPerPage = ' + itemsPerPage);

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

  //  Iterate over each contact.
  numEntries := xml.NumChildrenHavingTag('entry');
  i := 0;
  while i < numEntries do
    begin
      xml.I := i;
      WriteLn(i + 1 + ' ----');
      WriteLn('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');
      WriteLn('id: ' + idUrl);

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

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

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

      i := i + 1;
    end;



  jsonToken.Free;
  gAuth.Free;
  rest.Free;
  sbResponseBody.Free;
  xml.Free;
  fac.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.