Visual FoxPro

Azure Service Bus - Receive and Delete Message from Subscription

See more Azure Service Bus Examples

Shows how to receive and delete a message from an Azure service bus topic subscription. Visual FoxPro

LOCAL lnSuccess
LOCAL loRest
LOCAL lnBAutoReconnect
LOCAL loSbToken
LOCAL lcTopicName
LOCAL lcSubscriptionName
LOCAL loSbPath
LOCAL loSbResponseBody
LOCAL lcMessage

lnSuccess = 0

* 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('Chilkat.Rest')
lnBAutoReconnect = 1
lnSuccess = loRest.Connect("<yournamespace>.servicebus.windows.net",443,1,lnBAutoReconnect)
IF (lnSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    CANCEL
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..
* ----------------------------------------------------------------------------------------------

* 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('Chilkat.StringBuilder')
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())

* ----------------------------------------------------------------------------------------------

* Receive a message from the subscription "feedings" in the topic "gilaMonster"
lcTopicName = "gilaMonster"
lcSubscriptionName = "feedings"

* Build the path..
loSbPath = CreateObject('Chilkat.StringBuilder')
loSbPath.Append("/")
loSbPath.Append(lcTopicName)
loSbPath.Append("/subscriptions/")
loSbPath.Append(lcSubscriptionName)
loSbPath.Append("/messages/head")

* Add a timeout parameter.
loRest.AddQueryParam("timeout","20")

* Use the DELETE HTTP verb to read the message at the head of the queue and remove it.
loSbResponseBody = CreateObject('Chilkat.StringBuilder')
lnSuccess = loRest.FullRequestNoBodySb("DELETE",loSbPath.GetAsString(),loSbResponseBody)
IF (lnSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    RELEASE loSbToken
    RELEASE loSbPath
    RELEASE loSbResponseBody
    CANCEL
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
    CANCEL
ENDIF

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

? "Success."

RELEASE loRest
RELEASE loSbToken
RELEASE loSbPath
RELEASE loSbResponseBody