Pascal (Lazarus/Delphi)

VoiceBase -- Upload a Media File with a JSON Configuration

See more VoiceBase Examples

This example uploads a media file and also provides a configuration file. 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.JsonArray,
  Chilkat.HttpResponse,
  Chilkat.StringBuilder,
  Chilkat.JsonObject,
  Chilkat.HttpRequest;

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

procedure RunDemo;
var
  success: Boolean;
  accessToken: string;
  http: THttp;
  req: THttpRequest;
  sbAuth: TStringBuilder;
  json: TJsonObject;
  jConfig: TJsonObject;
  jKeywords: TJsonObject;
  jGroups: TJsonArray;
  resp: THttpResponse;

begin
  success := False;

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

  //  Insert your Bearer token here:
  accessToken := 'VOICEBASE_TOKEN';

  http := THttp.Create;

  req := THttpRequest.Create;
  req.HttpVerb := 'POST';
  req.Path := '/v2-beta/media';
  req.ContentType := 'multipart/form-data';

  //  Add the access (bearer) token to the request, which is a header
  //  having the following format:
  //  Authorization: Bearer <userAccessToken>
  sbAuth := TStringBuilder.Create;
  sbAuth.Append('Bearer ');
  sbAuth.Append(accessToken);
  req.AddHeader('Authorization',sbAuth.GetAsString());

  success := req.AddFileForUpload2('media','qa_data/wav/msg_123_abc.wav','audio/x-wav');
  if (success = False) then
    begin
      WriteLn(req.LastErrorText);
      Exit;
    end;

  //  This is the JSON of the configuration to be added as a parameter to the upload:
  //  (Obviously, if you want a callback, you would use a URL that goes to your own web server..)

  //  	{ 
  //  	   "configuration":{ 
  //  	      "publish":{ 
  //  	         "callbacks":[
  //  	            { 
  //  	               "url":"https://www.chilkatsoft.com/dss/update_vm_transcription.asp",
  //  	               "method":"POST",
  //  	               "include":[
  //  	                  "transcripts",
  //  	                  "keywords",
  //  	                  "topics",
  //  	                  "metadata"
  //  	               ]
  //  	            }
  //  	         ]
  //  	      },
  //  	      "keywords":{ 
  //  	         "groups":[]
  //  	      }
  //  	   }
  //  	}

  //  This code produces the above JSON.
  json := TJsonObject.Create;
  json.UpdateString('configuration.publish.callbacks[0].url','https://www.chilkatsoft.com/dss/update_vm_transcription.asp');
  json.UpdateString('configuration.publish.callbacks[0].method','POST');
  json.UpdateString('configuration.publish.callbacks[0].include[0]','transcripts');
  json.UpdateString('configuration.publish.callbacks[0].include[1]','keywords');
  json.UpdateString('configuration.publish.callbacks[0].include[2]','topics');
  json.UpdateString('configuration.publish.callbacks[0].include[3]','metadata');

  jConfig := TJsonObject.Create;
  json.ObjectOf2('configuration',jConfig);

  jKeywords := TJsonObject.Create;
  jConfig.AppendObject2('keywords',jKeywords);

  jGroups := TJsonArray.Create;
  jKeywords.AppendArray2('groups',jGroups);

  //  Add the configuration JSON to the upload.
  req.AddParam('configuration',json.Emit());

  //  Do the upload..
  resp := THttpResponse.Create;
  success := http.HttpSReq('apis.voicebase.com',443,True,req,resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  //  Examine the response status code and body.
  WriteLn('Response status code = ' + resp.StatusCode);

  //  The response should be JSON, even if an error.
  json.Load(resp.BodyStr);
  json.EmitCompact := False;

  WriteLn(json.Emit());

  //  A successful response will have a status code = 200
  if (resp.StatusCode <> 200) then
    begin
      WriteLn('Failed.');
    end
  else
    begin
      WriteLn('mediaId: ' + json.StringOf('mediaId'));
      WriteLn('href: ' + json.StringOf('_links.self.href'));
      WriteLn('status: ' + json.StringOf('status'));
      WriteLn('Success.');
    end;

  //  Here is an example of a successful response:

  //  	{ 
  //  	  "_links": { 
  //  	    "self": { 
  //  	      "href": "/v2-beta/media/856a1e85-c847-4c3c-b7a4-6cf15cd51db4"
  //  	    }
  //  	  },
  //  	  "mediaId": "856a1e85-c847-4c3c-b7a4-6cf15cd51db4",
  //  	  "status": "accepted",
  //  	  "metadata": {}
  //  	}


  http.Free;
  req.Free;
  sbAuth.Free;
  json.Free;
  jConfig.Free;
  jKeywords.Free;
  jGroups.Free;
  resp.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.