(Delphi ActiveX) Azure Service Bus - Create Subscription

Creates an Azure Service Bus Subscription.

Note: This example requires Chilkat v9.5.0.65 or greater.

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
rest: TChilkatRest;
bAutoReconnect: Integer;
success: Integer;
sbToken: TChilkatStringBuilder;
topicName: WideString;
subscriptionName: WideString;
xml: TChilkatXml;
sbRequestBody: TChilkatStringBuilder;
sbPath: TChilkatStringBuilder;
sbResponseBody: TChilkatStringBuilder;

begin
// Note: Requires Chilkat v9.5.0.65 or greater.

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

// Make the initial connection.
// A single REST object, once connected, can be used for many Azure Service Bus REST API calls.
// The auto-reconnect indicates that if the already-established HTTPS connection is closed,
// then it will be automatically re-established as needed.
rest := TChilkatRest.Create(Self);
bAutoReconnect := 1;
success := rest.Connect('<yournamespace>.servicebus.windows.net',443,1,bAutoReconnect);
if (success <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

// ----------------------------------------------------------------------------------------------
// The code above this comment could be placed inside a function/subroutine within the application
// because the connection does not need to be made for every request.  Once the connection is made
// the app may send many requests..
// ----------------------------------------------------------------------------------------------

// Let's load a previously computed SAS token and use it.
// See Azure Shared Access Signature for an example to genenerate an Azure SAS token.
sbToken := TChilkatStringBuilder.Create(Self);
sbToken.LoadFile('qa_data/tokens/serviceBusSas.txt','utf-8');

// Tell the REST object to use the Azure Shared Access Signature for authorization.
sbToken.Prepend('SharedAccessSignature ');
rest.AddHeader('Authorization',sbToken.GetAsString());

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

// Create a new subscription named "feedings";
topicName := 'gilaMonster';
subscriptionName := 'feedings';

// Create the XML body of the PUT request.
xml := TChilkatXml.Create(Self);
xml.Tag := 'entry';
xml.AddAttribute('xmlns','http://www.w3.org/2005/Atom');
xml.UpdateAttrAt('title',1,'type','text');
xml.UpdateChildContent('title',subscriptionName);
xml.UpdateAttrAt('content',1,'type','application/xml');
xml.UpdateAttrAt('content|SubscriptionDescription',1,'xmlns:i','http://www.w3.org/2001/XMLSchema-instance');
xml.UpdateAttrAt('content|SubscriptionDescription',1,'xmlns','http://schemas.microsoft.com/netservices/2010/10/servicebus/connect');
xml.EmitXmlDecl := 0;
Memo1.Lines.Add(xml.GetXml());

// The XML created by the above code:

// 	<entry xmlns="http://www.w3.org/2005/Atom">
// 	    <title type="text">feedings</title>
// 	    <content type="application/xml">
// 	        <SubscriptionDescription xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.microsoft.com/netservices/2010/10/servicebus/connect" />
// 	    </content>
// 	</entry>

sbRequestBody := TChilkatStringBuilder.Create(Self);
xml.GetXmlSb(sbRequestBody.ControlInterface);

// The path should be set to the to-be-created queue name.
sbPath := TChilkatStringBuilder.Create(Self);
sbPath.Append('/');
sbPath.Append(topicName);
sbPath.Append('/Subscriptions/');
sbPath.Append(subscriptionName);

sbResponseBody := TChilkatStringBuilder.Create(Self);
success := rest.FullRequestSb('PUT',sbPath.GetAsString(),sbRequestBody.ControlInterface,sbResponseBody.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('Response Status Code = ' + IntToStr(rest.ResponseStatusCode));

// Check for a success response.
if (rest.ResponseStatusCode <> 201) then
  begin
    Memo1.Lines.Add(rest.LastRequestStartLine);
    Memo1.Lines.Add(rest.LastRequestHeader);
    Memo1.Lines.Add(sbResponseBody.GetAsString());
    Memo1.Lines.Add('Failed.');
    Exit;
  end;

// The response is XML.  (See a sample response below..)
xml.LoadSb(sbResponseBody.ControlInterface,1);
Memo1.Lines.Add(xml.GetXml());

Memo1.Lines.Add('Success.');

// -----------------------------------------------
// A sample successful XML response:

// 	<entry xmlns="http://www.w3.org/2005/Atom">
// 	    <id>https://chilkat.servicebus.windows.net/gilaMonster/Subscriptions/feedings</id>
// 	    <title type="text">feedings</title>
// 	    <published>2016-12-07T16:02:24Z</published>
// 	    <updated>2016-12-07T16:02:24Z</updated>
// 	    <link rel="self" href="https://chilkat.servicebus.windows.net/gilaMonster/Subscriptions/feedings" />
// 	    <content type="application/xml">
// 	        <SubscriptionDescription xmlns="http://schemas.microsoft.com/netservices/2010/10/servicebus/connect" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
// 	            <LockDuration>PT1M</LockDuration>
// 	            <RequiresSession>false</RequiresSession>
// 	            <DefaultMessageTimeToLive>P10675199DT2H48M5.4775807S</DefaultMessageTimeToLive>
// 	            <DeadLetteringOnMessageExpiration>false</DeadLetteringOnMessageExpiration>
// 	            <DeadLetteringOnFilterEvaluationExceptions>true</DeadLetteringOnFilterEvaluationExceptions>
// 	            <MessageCount>0</MessageCount>
// 	            <MaxDeliveryCount>10</MaxDeliveryCount>
// 	            <EnableBatchedOperations>true</EnableBatchedOperations>
// 	        </SubscriptionDescription>
// 	    </content>
// 	</entry>
end;