Pascal (Lazarus/Delphi)

S3 Add Tags to an Object

See more Amazon S3 (new) Examples

Demonstrates how to add one or more tags to an S3 object. 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.AuthAws,
  Chilkat.Rest,
  Chilkat.Xml,
  Chilkat.StringBuilder;

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

procedure RunDemo;
var
  success: Boolean;
  rest: TRest;
  bTls: Boolean;
  port: Integer;
  bAutoReconnect: Boolean;
  authAws: TAuthAws;
  xml: TXml;
  sbRequestBody: TStringBuilder;
  sbResponse: TStringBuilder;

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 in the desired region.
  //  (for us-east-1, we use "s3.amazonaws.com", but for another region, such as us-west-2, we would use "s3-us-west-2.amazonaws.com")
  bTls := True;
  port := 443;
  bAutoReconnect := True;
  success := rest.Connect('s3.amazonaws.com',port,bTls,bAutoReconnect);

  //  Provide AWS credentials.
  authAws := TAuthAws.Create;
  authAws.AccessKey := 'AWS_ACCESS_KEY';
  authAws.SecretKey := 'AWS_SECRET_KEY';
  authAws.ServiceName := 's3';
  authAws.Region := 'us-east-1';

  rest.SetAuthAws(authAws);

  //  Set the bucket name via the HOST header.
  //  In this case, the bucket name is "chilkat100".
  //  Note that the Host header should use "bucketName.s3.amazonaws.com", not "bucketName.s3-us-east-1.amazonaws.com"
  //  The same applies to aother regions.  The Host header should simply be <bucketName>.s3.amazonaws.com regardless of the region.
  rest.Host := 'chilkat100.s3.amazonaws.com';

  xml := TXml.Create;
  xml.Tag := 'Tagging';
  xml.UpdateChildContent('TagSet|Tag|Key','plant');
  xml.UpdateChildContent('TagSet|Tag|Value','chili pepper');

  sbRequestBody := TStringBuilder.Create;
  xml.GetXmlSb(sbRequestBody);

  //  It is important to add the terminating "=" after the "?tagging".
  sbResponse := TStringBuilder.Create;
  success := rest.FullRequestSb('PUT','/chiliPepper.gif?tagging=',sbRequestBody,sbResponse);
  if (success = False) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  WriteLn('Response status code: ' + rest.ResponseStatusCode);

  //  When successful, the S3 Storage service will respond with a 200 response code,
  //  with an XML body.  
  if (rest.ResponseStatusCode <> 200) then
    begin
      //  Examine the request/response to see what happened.
      WriteLn('response status code = ' + rest.ResponseStatusCode);
      WriteLn('response status text = ' + rest.ResponseStatusText);
      WriteLn('response header: ' + rest.ResponseHeader);
      WriteLn('response body: ' + sbResponse.GetAsString());
      WriteLn('---');
      WriteLn('LastRequestStartLine: ' + rest.LastRequestStartLine);
      WriteLn('LastRequestHeader: ' + rest.LastRequestHeader);
    end;

  WriteLn(sbResponse.GetAsString());
  WriteLn('Success.');


  rest.Free;
  authAws.Free;
  xml.Free;
  sbRequestBody.Free;
  sbResponse.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.