Delphi DLL
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 Delphi DLL Downloads

Delphi DLL
uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, AuthAws, Rest, Xml;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
rest: HCkRest;
bTls: Boolean;
port: Integer;
bAutoReconnect: Boolean;
authAws: HCkAuthAws;
responseXml: PWideChar;
xml: HCkXml;
unused: PWideChar;
rec: HCkXml;

begin
success := False;

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

rest := CkRest_Create();

// Connect to the Amazon AWS REST server.
// such as https://sqs.us-west-2.amazonaws.com/
bTls := True;
port := 443;
bAutoReconnect := True;
success := CkRest_Connect(rest,'sqs.us-west-2.amazonaws.com',port,bTls,bAutoReconnect);

// Provide AWS credentials for the REST call.
authAws := CkAuthAws_Create();
CkAuthAws_putAccessKey(authAws,'AWS_ACCESS_KEY');
CkAuthAws_putSecretKey(authAws,'AWS_SECRET_KEY');
// the region should match our URL above..
CkAuthAws_putRegion(authAws,'us-west-2');
CkAuthAws_putServiceName(authAws,'sqs');

CkRest_SetAuthAws(rest,authAws);

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

// Use the actual path part of your SQS queue URL here:
responseXml := CkRest__fullRequestNoBody(rest,'GET','/123456789123/chilkatTest');
if (CkRest_getLastMethodSuccess(rest) <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

// A successful response will have a status code equal to 200.
if (CkRest_getResponseStatusCode(rest) <> 200) then
  begin
    Memo1.Lines.Add('response status code = ' + IntToStr(CkRest_getResponseStatusCode(rest)));
    Memo1.Lines.Add('response status text = ' + CkRest__responseStatusText(rest));
    Memo1.Lines.Add('response header: ' + CkRest__responseHeader(rest));
    Memo1.Lines.Add('response body: ' + responseXml);
    Exit;
  end;

// Examine the successful XML response.
xml := CkXml_Create();
CkXml_LoadXml(xml,responseXml);
Memo1.Lines.Add(CkXml__getXml(xml));
Memo1.Lines.Add('----');

// 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:
Memo1.Lines.Add('Body: ' + CkXml__chilkatPath(xml,'ReceiveMessageResult|Message|Body|*'));
Memo1.Lines.Add('MessageId: ' + CkXml__chilkatPath(xml,'ReceiveMessageResult|Message|MessageId|*'));

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

rec := CkXml_FindNextRecord(xml,'Name','SenderId');
Memo1.Lines.Add('SenderId: ' + CkXml__getChildContent(rec,'Value'));
CkXml_Dispose(rec);

rec := CkXml_FindNextRecord(xml,'Name','ApproximateFirstReceiveTimestamp');
Memo1.Lines.Add('ApproximateFirstReceiveTimestamp: ' + CkXml__getChildContent(rec,'Value'));
CkXml_Dispose(rec);

rec := CkXml_FindNextRecord(xml,'Name','ApproximateReceiveCount');
Memo1.Lines.Add('ApproximateReceiveCount: ' + CkXml__getChildContent(rec,'Value'));
CkXml_Dispose(rec);

rec := CkXml_FindNextRecord(xml,'Name','SentTimestamp');
Memo1.Lines.Add('SentTimestamp: ' + CkXml__getChildContent(rec,'Value'));
CkXml_Dispose(rec);

CkXml_GetRoot2(xml);

CkRest_Dispose(rest);
CkAuthAws_Dispose(authAws);
CkXml_Dispose(xml);

end;