(Xojo Plugin) Azure Service Bus - Send Message to Topic

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Example code showing how to send a message to an Azure Service Bus Topic.

Chilkat Xojo Plugin Download Xojo Plugin for Windows, Linux, Mac OS X, and ARM, ARM64

// 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.
Dim rest As New Chilkat.Rest
Dim bAutoReconnect As Boolean
bAutoReconnect = True
Dim success As Boolean
success = rest.Connect("<yournamespace>.servicebus.windows.net",443,True,bAutoReconnect)
If (success <> True) Then
    System.DebugLog(rest.LastErrorText)
    Return
End If

// ----------------------------------------------------------------------------------------------
// 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.
Dim sbToken As New Chilkat.StringBuilder
success = sbToken.LoadFile("qa_data/tokens/serviceBusSas.txt","utf-8")

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

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

// The code for sending to a topic is identical to the code sending to a queue.
// The only difference is that a topic name (or topic path) is used instead of queue name/path.

// Send to a topic named "gilaMonster";
Dim topicName As String
topicName = "gilaMonster"

// The HTTP request body contains the content of the message sent to the topic.
Dim sbRequestBody As New Chilkat.StringBuilder
success = sbRequestBody.Append("Hello, I'm a gila monster!")

// Build the path..
Dim sbPath As New Chilkat.StringBuilder
success = sbPath.Append("/")
success = sbPath.Append(topicName)
success = sbPath.Append("/messages")

// Add timeout and api-version query parameters.
success = rest.AddQueryParam("timeout","20")
success = rest.AddQueryParam("api-version","2013-08")

// Standard brokered message properties are placed in a BrokerProperties HTTP header. 
// The broker properties must be serialized in JSON format. To specify a TimeToLive value of 3600 seconds 
// and to add a message label "M1" to the message..
Dim json As New Chilkat.JsonObject
success = json.AppendInt("TimeToLive",3600)
success = json.AppendString("Label","A123")
success = rest.AddHeader("BrokerProperties",json.Emit())

// To add custom properties, such as "Priority" and "Color"
success = rest.AddHeader("Priority","High")
success = rest.AddHeader("Color","pink")

Dim sbResponseBody As New Chilkat.StringBuilder
success = rest.FullRequestSb("POST",sbPath.GetAsString(),sbRequestBody,sbResponseBody)
If (success <> True) Then
    System.DebugLog(rest.LastErrorText)
    Return
End If

System.DebugLog("Response Status Code = " + Str(rest.ResponseStatusCode))

// Check for a success response.
If (rest.ResponseStatusCode <> 201) Then
    System.DebugLog(rest.LastRequestStartLine)
    System.DebugLog(rest.LastRequestHeader)
    System.DebugLog(sbResponseBody.GetAsString())
    System.DebugLog("Failed.")
    Return
End If

// If successful, the 201 response will have no response body.

System.DebugLog("Success.")