Pascal (Lazarus/Delphi)
SQS Receive Message

Retrieves one or more messages from an Amazon SQS queue, with a maximum limit of 10 messages, from the specified queue.
See SQS ReceiveMessage or detailed information.
Chilkat Pascal (Lazarus/Delphi) Downloads

Download Chilkat for Pascal (Lazarus/Delphi)
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;

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

procedure RunDemo;
var
  success: Boolean;
  rest: TRest;
  bTls: Boolean;
  port: Integer;
  bAutoReconnect: Boolean;
  authAws: TAuthAws;
  responseXml: string;
  xml: TXml;
  unused: string;
  rec: TXml;

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.
  //  such as https://sqs.us-west-2.amazonaws.com/
  bTls := True;
  port := 443;
  bAutoReconnect := True;
  success := rest.Connect('sqs.us-west-2.amazonaws.com',port,bTls,bAutoReconnect);

  //  Provide AWS credentials for the REST call.
  authAws := TAuthAws.Create;
  authAws.AccessKey := 'AWS_ACCESS_KEY';
  authAws.SecretKey := 'AWS_SECRET_KEY';
  //  the region should match our URL above..
  authAws.Region := 'us-west-2';
  authAws.ServiceName := 'sqs';

  rest.SetAuthAws(authAws);

  rest.AddQueryParam('Action','ReceiveMessage');
  rest.AddQueryParam('MaxNumberOfMessages','5');
  rest.AddQueryParam('VisibilityTimeout','15');
  rest.AddQueryParam('AttributeName','All');
  rest.AddQueryParam('MessageAttributeName','All');

  //  Use the actual path part of your SQS queue URL here:
  responseXml := rest.FullRequestNoBody('GET','/123456789123/chilkatTest');
  if (rest.LastMethodSuccess <> True) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  //  A successful response will have a status code equal to 200.
  if (rest.ResponseStatusCode <> 200) then
    begin
      WriteLn('response status code = ' + rest.ResponseStatusCode);
      WriteLn('response status text = ' + rest.ResponseStatusText);
      WriteLn('response header: ' + rest.ResponseHeader);
      WriteLn('response body: ' + responseXml);
      Exit;
    end;

  //  Examine the successful XML response.
  xml := TXml.Create;
  xml.LoadXml(responseXml);
  WriteLn(xml.GetXml());
  WriteLn('----');

  //  A successful response looks like this:
  //  <?xml version="1.0" encoding="utf-8" ?>
  //  <ReceiveMessageResponse xmlns="http://queue.amazonaws.com/doc/2012-11-05/">
  //      <ReceiveMessageResult>
  //          <Message>
  //              <Body>this is a test</Body>
  //              <MD5OfBody>54b0c58c7ce9f2a8b551351102ee0938</MD5OfBody>
  //              <ReceiptHandle>AQEBMyLof...UbKBTvHtEg==</ReceiptHandle>
  //              <Attribute>
  //                  <Name>SenderId</Name>
  //                  <Value>957491831129</Value>
  //              </Attribute>
  //              <Attribute>
  //                  <Name>ApproximateFirstReceiveTimestamp</Name>
  //                  <Value>1475013283557</Value>
  //              </Attribute>
  //              <Attribute>
  //                  <Name>ApproximateReceiveCount</Name>
  //                  <Value>4</Value>
  //              </Attribute>
  //              <Attribute>
  //                  <Name>SentTimestamp</Name>
  //                  <Value>1475013283557</Value>
  //              </Attribute>
  //              <MessageId>52882c65-5e21-4450-9024-93a3b01e61d3</MessageId>
  //              <MD5OfMessageAttributes>2ff68603f4239272bd03f543254ed040</MD5OfMessageAttributes>
  //          </Message>
  //      </ReceiveMessageResult>
  //      <ResponseMetadata>
  //          <RequestId>05ba5c92-80ee-5f87-be76-0cf67b7475d6</RequestId>
  //      </ResponseMetadata>
  //  </ReceiveMessageResponse>

  //  Get some values from the XML:
  WriteLn('Body: ' + xml.ChilkatPath('ReceiveMessageResult|Message|Body|*'));
  WriteLn('MessageId: ' + xml.ChilkatPath('ReceiveMessageResult|Message|MessageId|*'));

  unused := xml.ChilkatPath('ReceiveMessageResult|Message[0]|Attribute|$');

  rec := xml.FindNextRecord('Name','SenderId');
  WriteLn('SenderId: ' + rec.GetChildContent('Value'));
  rec.Free;

  rec := xml.FindNextRecord('Name','ApproximateFirstReceiveTimestamp');
  WriteLn('ApproximateFirstReceiveTimestamp: ' + rec.GetChildContent('Value'));
  rec.Free;

  rec := xml.FindNextRecord('Name','ApproximateReceiveCount');
  WriteLn('ApproximateReceiveCount: ' + rec.GetChildContent('Value'));
  rec.Free;

  rec := xml.FindNextRecord('Name','SentTimestamp');
  WriteLn('SentTimestamp: ' + rec.GetChildContent('Value'));
  rec.Free;

  xml.GetRoot2();


  rest.Free;
  authAws.Free;
  xml.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.