Pascal (Lazarus/Delphi)

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Demonstrates how to use the Cloud Translation API to translate text from one spoken language to another. The example translates from English to Spanish. 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.Http,
  Chilkat.HttpResponse,
  Chilkat.JsonObject;

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

procedure RunDemo;
var
  success: Boolean;
  jsonToken: TJsonObject;
  http: THttp;
  json: TJsonObject;
  resp: THttpResponse;
  jResp: TJsonObject;
  respStatusCode: Integer;
  translatedText: string;
  i: Integer;
  n: Integer;

begin
  success := False;

  //  This example assumes the Chilkat API to have been previously unlocked.
  //  See Global Unlock Sample for sample code.

  //  --------------------------------------------------------------------------------
  //  IMPORTANT: 
  //  Don't forget you need to 1st enable the Cloud Translation API in your Google Developers Console at https://console.cloud.google.com
  //  --------------------------------------------------------------------------------

  //  It is assumed we previously obtained an OAuth2 access token.
  //  This example loads the JSON access token file 
  jsonToken := TJsonObject.Create;
  success := jsonToken.LoadFile('qa_data/tokens/_googleTranslate.json');
  if (success <> True) then
    begin
      WriteLn('Failed to load _googleTranslate.json');
      Exit;
    end;

  http := THttp.Create;

  http.AuthToken := jsonToken.StringOf('access_token');

  //  The following JSON is sent in the request body.

  //  {
  //      "q": "The quick brown fox jumped over the lazy dog.",
  //      "source": "en",
  //      "target": "es",
  //      "format": "text"
  //  }

  json := TJsonObject.Create;
  //  The following code creates the JSON request body.
  json.UpdateString('q','The quick brown fox jumped over the lazy dog.');
  json.UpdateString('source','en');
  json.UpdateString('target','es');
  json.UpdateString('format','text');

  json.EmitCompact := False;
  WriteLn(json.Emit());

  resp := THttpResponse.Create;
  success := http.HttpJson('POST','https://translation.googleapis.com/language/translate/v2',json,'application/json',resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  jResp := TJsonObject.Create;
  resp.GetBodyJson(jResp);
  jResp.EmitCompact := False;

  WriteLn('Response Body:');
  WriteLn(jResp.Emit());

  respStatusCode := resp.StatusCode;
  WriteLn('Response Status Code = ' + respStatusCode);
  if (respStatusCode >= 400) then
    begin
      WriteLn('Response Header:');
      WriteLn(resp.Header);
      WriteLn('Failed.');
      Exit;
    end;

  //  Sample JSON response:
  //  (Sample code for parsing the JSON response is shown below)

  //  {
  //    "data": {
  //      "translations": [
  //        {
  //          "translatedText": "El zorro r�pida salt� sobre el perro perezoso."
  //        }
  //      ]
  //    }
  //  }

  i := 0;
  n := jResp.SizeOfArray('data.translations');
  while i < n do
    begin
      jResp.I := i;
      translatedText := jResp.StringOf('data.translations[i].translatedText');
      WriteLn(translatedText);
      i := i + 1;
    end;



  jsonToken.Free;
  http.Free;
  json.Free;
  resp.Free;
  jResp.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.