Pascal (Lazarus/Delphi)

Initiate Resumable Upload Session

See more Google Cloud Storage Examples

Initiate a Google Cloud Storage resumable upload session.. 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;
  http: THttp;
  jsonToken: TJsonObject;
  jsonMetaData: TJsonObject;
  url: string;
  resp: THttpResponse;
  statusCode: Integer;
  sessionUrl: string;

begin
  success := False;

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

  http := THttp.Create;

  jsonToken := TJsonObject.Create;
  success := jsonToken.LoadFile('qa_data/tokens/googleCloudStorage.json');
  if (success = False) then
    begin
      WriteLn(jsonToken.LastErrorText);
      Exit;
    end;

  jsonMetaData := TJsonObject.Create;
  jsonMetaData.UpdateString('contentType','image/jpeg');

  //  Adds the "Authorization: Bearer <access_token>" header..
  http.AuthToken := jsonToken.StringOf('access_token');

  http.SetUrlVar('bucket_name','chilkat-bucket-b');
  http.SetUrlVar('object_name','penguins2.jpg');
  url := 'https://storage.googleapis.com/upload/storage/v1/b/{$bucket_name}/o?uploadType=resumable&name={$object_name}';
  resp := THttpResponse.Create;
  success := http.HttpJson('POST',url,jsonMetaData,'application/json',resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  statusCode := resp.StatusCode;
  WriteLn('response status code = ' + statusCode);

  sessionUrl := '';

  if (statusCode <> 200) then
    begin
      WriteLn(resp.BodyStr);
    end
  else
    begin
      //  The session URL will be used to upload the file in chunks, in subsequent HTTP POSTs...
      sessionUrl := resp.GetHeaderField('Location');
      WriteLn('Session URL = ' + sessionUrl);
    end;


  http.Free;
  jsonToken.Free;
  jsonMetaData.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.