Pascal (Lazarus/Delphi)

Retrieve a Single Contact

See more Google APIs Examples

Demonstrates how to retrieve a single contact (by contactId) for the Google Contacts API. 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.StringBuilder,
  Chilkat.AuthGoogle,
  Chilkat.Xml,
  Chilkat.JsonObject,
  Chilkat.Rest;

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

procedure RunDemo;
var
  success: Boolean;
  jsonToken: TJsonObject;
  gAuth: TAuthGoogle;
  rest: TRest;
  bAutoReconnect: Boolean;
  sbPath: TStringBuilder;
  numReplacements: Integer;
  sbResponseBody: TStringBuilder;
  xml: TXml;
  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 contact, send the following:

  //  	GET /m8/feeds/contacts/default/full/{contactId}
  //  	GData-Version: 3.0

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

  sbPath := TStringBuilder.Create;
  sbPath.Append('/m8/feeds/contacts/default/full/{contactId}');
  //  Get the contact having contactId = "7b1c7b6409e718a0"
  numReplacements := sbPath.Replace('{contactId}','7b1c7b6409e718a0');

  sbResponseBody := TStringBuilder.Create;
  success := rest.FullRequestNoBodySb('GET',sbPath.GetAsString(),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_contact.xml');

  //  Now let's parse the XML...
  WriteLn('title: ' + xml.GetChildContent('title'));

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

  //  The response body XML looks something like this:

  //  	<?xml version="1.0" encoding="UTF-8" ?>
  //  	<entry gd:etag="&quot;R3kzezVSLit7I2A9XRFaFE8DQAU.&quot;" xmlns="http://www.w3.org/2005/Atom" xmlns:batch="http://schemas.google.com/gdata/batch" xmlns:gContact="http://schemas.google.com/contact/2008" xmlns:gd="http://schemas.google.com/g/2005">
  //  	    <id>http://www.google.com/m8/feeds/contacts/support%40chilkatcloud.com/base/7b1c7b6409e718a0</id>
  //  	    <updated>2016-11-18T00:41:56.783Z</updated>
  //  	    <app:edited xmlns:app="http://www.w3.org/2007/app">2016-11-18T00:41:56.783Z</app:edited>
  //  	    <category scheme="http://schemas.google.com/g/2005#kind" term="http://schemas.google.com/contact/2008#contact" />
  //  	    <title>Chilkat Cloud</title>
  //  	    <link rel="http://schemas.google.com/contacts/2008/rel#photo" type="image/*" href="https://www.googleapis.com/m8/feeds/photos/media/support%40chilkatcloud.com/7b1c7b6409e718a0" gd:etag="&quot;fgVhPls4Sit7I2BWHUlTWkQMKHUZKHkkaiw.&quot;" />
  //  	    <link rel="self" type="application/atom+xml" href="https://www.googleapis.com/m8/feeds/contacts/support%40chilkatcloud.com/full/7b1c7b6409e718a0" />
  //  	    <link rel="edit" type="application/atom+xml" href="https://www.googleapis.com/m8/feeds/contacts/support%40chilkatcloud.com/full/7b1c7b6409e718a0" />
  //  	    <gd:name>
  //  	        <gd:fullName>Chilkat Cloud</gd:fullName>
  //  	        <gd:givenName>Chilkat</gd:givenName>
  //  	        <gd:familyName>Cloud</gd:familyName>
  //  	    </gd:name>
  //  	    <gd:email rel="http://schemas.google.com/g/2005#other" address="support@chilkatcloud.com" primary="true" />
  //  	    <gContact:groupMembershipInfo deleted="false" href="http://www.google.com/m8/feeds/groups/support%40chilkatcloud.com/base/6" />
  //  	</entry>


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