Pascal (Lazarus/Delphi)

Download Google Contact Photo

See more Google APIs Examples

Demonstrates how to download Google Contact's photo. 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.BinData,
  Chilkat.JsonObject,
  Chilkat.Rest;

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

procedure RunDemo;
var
  success: Boolean;
  jsonToken: TJsonObject;
  gAuth: TAuthGoogle;
  rest: TRest;
  bAutoReconnect: Boolean;
  sbPath: TStringBuilder;
  contactId: string;
  numReplacements: Integer;
  imageData: TBinData;
  sbResponseBody: TStringBuilder;
  sbContentType: TStringBuilder;

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 get the photo, send the following:

  //  	GET /m8/feeds/photos/media/default/contactId

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

  sbPath := TStringBuilder.Create;
  //  Get the photo for the contact having contactId = "1ea2e4fe0ef24e09"
  contactId := '1ea2e4fe0ef24e09';
  sbPath.SetString('/m8/feeds/photos/media/default/{contactId}');
  numReplacements := sbPath.Replace('{contactId}',contactId);

  imageData := TBinData.Create;
  success := rest.FullRequestNoBodyBd('GET',sbPath.GetAsString(),imageData);
  if (success <> True) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  //  A 404 response indicates the contact has no photo.
  //  (We could've first fetched the contact information, parsed out the 
  //  photo etag, and then if no photo etag existed, we'd know the contact has no
  //  photo.  Or... we can just try to download the photo and if a 404 is received,
  //  we know there's no photo.  Much simpler.)
  if (rest.ResponseStatusCode = 404) then
    begin
      WriteLn('This contact has no photo.');
      Exit;
    end;

  //  A successful response will have a status code equal to 200.
  if (rest.ResponseStatusCode <> 200) then
    begin
      //  If the response was not successful, then the response body
      //  does not contain image data.  Instead it contains XML.
      sbResponseBody := TStringBuilder.Create;
      sbResponseBody.AppendBd(imageData,'utf-8',0,0);

      WriteLn('response status code = ' + rest.ResponseStatusCode);
      WriteLn('response status text = ' + rest.ResponseStatusText);
      WriteLn('response header: ' + rest.ResponseHeader);
      WriteLn('response body: ' + sbResponseBody.GetAsString());
      WriteLn('request startline: ' + rest.LastRequestStartLine);
      WriteLn('request header: ' + rest.LastRequestHeader);
      Exit;
    end;

  //  Examine the content-type in the response header so we know what file
  //  extension to use (.jpg, .png, etc.)
  sbContentType := TStringBuilder.Create;
  sbContentType.Append(rest.ResponseHdrByName('Content-Type'));

  if (sbContentType.ContentsEqual('image/jpeg',False) = True) then
    begin
      imageData.WriteFile('qa_output/contact_photo.jpg');
    end;
  if (sbContentType.ContentsEqual('image/png',False) = True) then
    begin
      imageData.WriteFile('qa_output/contact_photo.png');
    end;

  WriteLn('Content-Type: ' + sbContentType.GetAsString());
  WriteLn('Success.');


  jsonToken.Free;
  gAuth.Free;
  rest.Free;
  sbPath.Free;
  imageData.Free;
      sbResponseBody.Free;
  sbContentType.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.