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Lianja Examples

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(Lianja) Azure Service Bus - Read Queued Message

Demonstrates read a message from an Azure Service Bus Queue. The message is received and removed from the queue.

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

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//  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.
loRest = createobject("CkRest")
llBAutoReconnect = .T.
llSuccess = loRest.Connect("<yournamespace>.servicebus.windows.net",443,.T.,llBAutoReconnect)
if (llSuccess <> .T.) then
    ? loRest.LastErrorText
    release loRest
    return
endif

//  ----------------------------------------------------------------------------------------------
//  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..
//  ----------------------------------------------------------------------------------------------

//  Receive and delete a message from a queue named "gila";
lcQueueName = "gila"

//  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.
loSbToken = createobject("CkStringBuilder")
loSbToken.LoadFile("qa_data/tokens/serviceBusSas.txt","utf-8")

//  Tell the REST object to use the Azure Shared Access Signature for authorization.
loSbToken.Prepend("SharedAccessSignature ")
loRest.AddHeader("Authorization",loSbToken.GetAsString())

//  Build the path..
loSbPath = createobject("CkStringBuilder")
loSbPath.Append("/")
loSbPath.Append(lcQueueName)
loSbPath.Append("/messages/head")

//  Add timeout and api-version query parameters.
loRest.AddQueryParam("timeout","60")
loRest.AddQueryParam("api-version","2013-08")

//  Use the DELETE HTTP verb to read the message at the head of the queue and remove it.
loSbResponseBody = createobject("CkStringBuilder")
llSuccess = loRest.FullRequestNoBodySb("DELETE",loSbPath.GetAsString(),loSbResponseBody)
if (llSuccess <> .T.) then
    ? loRest.LastErrorText
    release loRest
    release loSbToken
    release loSbPath
    release loSbResponseBody
    return
endif

? "Response Status Code = " + str(loRest.ResponseStatusCode)

//  Check for a success response.
if (loRest.ResponseStatusCode <> 200) then
    ? loRest.LastRequestStartLine
    ? loRest.LastRequestHeader
    ? loSbResponseBody.GetAsString()
    ? "Failed."
    release loRest
    release loSbToken
    release loSbPath
    release loSbResponseBody
    return
endif

//  If successful, the message is the contents of the response body.
lcMessage = loSbResponseBody.GetAsString()
? "Dequeued message: " + lcMessage

? "Success."


release loRest
release loSbToken
release loSbPath
release loSbResponseBody

 

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