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

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
rest: HCkRest;
bAutoReconnect: Boolean;
success: Boolean;
sbToken: HCkStringBuilder;
topicName: PWideChar;
subscriptionName: PWideChar;
xml: HCkXml;
sbRequestBody: HCkStringBuilder;
sbPath: HCkStringBuilder;
sbResponseBody: HCkStringBuilder;

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 := CkRest_Create();
bAutoReconnect := True;
success := CkRest_Connect(rest,'<yournamespace>.servicebus.windows.net',443,True,bAutoReconnect);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    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 := CkStringBuilder_Create();
CkStringBuilder_LoadFile(sbToken,'qa_data/tokens/serviceBusSas.txt','utf-8');

// Tell the REST object to use the Azure Shared Access Signature for authorization.
CkStringBuilder_Prepend(sbToken,'SharedAccessSignature ');
CkRest_AddHeader(rest,'Authorization',CkStringBuilder__getAsString(sbToken));

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

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

// Create the XML body of the PUT request.
xml := CkXml_Create();
CkXml_putTag(xml,'entry');
CkXml_AddAttribute(xml,'xmlns','http://www.w3.org/2005/Atom');
CkXml_UpdateAttrAt(xml,'title',True,'type','text');
CkXml_UpdateChildContent(xml,'title',subscriptionName);
CkXml_UpdateAttrAt(xml,'content',True,'type','application/xml');
CkXml_UpdateAttrAt(xml,'content|SubscriptionDescription',True,'xmlns:i','http://www.w3.org/2001/XMLSchema-instance');
CkXml_UpdateAttrAt(xml,'content|SubscriptionDescription',True,'xmlns','http://schemas.microsoft.com/netservices/2010/10/servicebus/connect');
CkXml_putEmitXmlDecl(xml,False);
Memo1.Lines.Add(CkXml__getXml(xml));

// 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 := CkStringBuilder_Create();
CkXml_GetXmlSb(xml,sbRequestBody);

// The path should be set to the to-be-created queue name.
sbPath := CkStringBuilder_Create();
CkStringBuilder_Append(sbPath,'/');
CkStringBuilder_Append(sbPath,topicName);
CkStringBuilder_Append(sbPath,'/Subscriptions/');
CkStringBuilder_Append(sbPath,subscriptionName);

sbResponseBody := CkStringBuilder_Create();
success := CkRest_FullRequestSb(rest,'PUT',CkStringBuilder__getAsString(sbPath),sbRequestBody,sbResponseBody);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

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

// Check for a success response.
if (CkRest_getResponseStatusCode(rest) <> 201) then
  begin
    Memo1.Lines.Add(CkRest__lastRequestStartLine(rest));
    Memo1.Lines.Add(CkRest__lastRequestHeader(rest));
    Memo1.Lines.Add(CkStringBuilder__getAsString(sbResponseBody));
    Memo1.Lines.Add('Failed.');
    Exit;
  end;

// The response is XML.  (See a sample response below..)
CkXml_LoadSb(xml,sbResponseBody,True);
Memo1.Lines.Add(CkXml__getXml(xml));

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>

CkRest_Dispose(rest);
CkStringBuilder_Dispose(sbToken);
CkXml_Dispose(xml);
CkStringBuilder_Dispose(sbRequestBody);
CkStringBuilder_Dispose(sbPath);
CkStringBuilder_Dispose(sbResponseBody);

end;