Pascal (Lazarus/Delphi)

REST Upload String

See more Amazon S3 (new) Examples

Example to upload the contents of a string to the Amazon S3 service. 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.FileAccess,
  Chilkat.AuthAws,
  Chilkat.Rest;

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

procedure RunDemo;
var
  success: Boolean;
  rest: TRest;
  bTls: Boolean;
  port: Integer;
  bAutoReconnect: Boolean;
  authAws: TAuthAws;
  fac: TFileAccess;
  fileContents: string;
  responseBodyStr: string;
  statusCode: Integer;

begin
  success := False;

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

  rest := TRest.Create;

  //  Connect to the Amazon AWS REST server.
  bTls := True;
  port := 443;
  bAutoReconnect := True;
  success := rest.Connect('s3.amazonaws.com',port,bTls,bAutoReconnect);

  //  ----------------------------------------------------------------------------
  //  Important: For buckets created in regions outside us-east-1,
  //  there are three important changes that need to be made.
  //  See Working with S3 Buckets in Non-us-east-1 Regions for the details.
  //  ----------------------------------------------------------------------------

  //  Provide AWS credentials for the REST call.
  authAws := TAuthAws.Create;
  authAws.AccessKey := 'AWS_ACCESS_KEY';
  authAws.SecretKey := 'AWS_SECRET_KEY';
  authAws.ServiceName := 's3';
  success := rest.SetAuthAws(authAws);

  //  Set the bucket name via the HOST header.
  //  In this case, the bucket name is "chilkat100".
  rest.Host := 'chilkat100.s3.amazonaws.com';

  //  Load a text file into memory.
  fac := TFileAccess.Create;
  fileContents := fac.ReadEntireTextFile('qa_data/xml/hamlet.xml','utf-8');
  if (fac.LastMethodSuccess <> True) then
    begin
      WriteLn(fac.LastErrorText);
      Exit;
    end;

  //  To send the file in gzip or deflate compressed format, set the Content-Encoding request
  //  header to "gzip" or "deflate".  (this is optional)
  success := rest.AddHeader('Content-Encoding','gzip');

  //  Indicate the Content-Type of our upload.  (This is optional)
  success := rest.AddHeader('Content-Type','text/xml');

  //  We can add an "Expect: 100-continue" header so that if the request is rejected
  //  by the server immediately after receiving the request header, it can respond
  //  and the client (Chilkat) can avoid sending the file data.
  //  (this is optional)
  success := rest.AddHeader('Expect','100-continue');

  //  Upload the file to Amazon S3.
  responseBodyStr := rest.FullRequestString('PUT','/hamlet_play.xml',fileContents);
  if (rest.LastMethodSuccess <> True) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  //  Did we get a 200 response indicating success?
  statusCode := rest.ResponseStatusCode;
  if (statusCode <> 200) then
    begin
      WriteLn('Error response: ' + responseBodyStr);
      WriteLn('Status code: ' + statusCode + ', Status text: ' + rest.ResponseStatusText);
      Exit;
    end;

  WriteLn('File successfully uploaded.');


  rest.Free;
  authAws.Free;
  fac.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.