(MFC) Azure Service Bus - Delete Message

See more Azure Service Bus Examples

Deletes a message from a queue or subscription.

For more information, see https://docs.microsoft.com/en-us/rest/api/servicebus/unlock-message

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkRest.h>
#include <CkStringBuilder.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // 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.
    CkRest rest;
    bool bAutoReconnect = true;
    bool success = rest.Connect("<yournamespace>.servicebus.windows.net",443,true,bAutoReconnect);
    if (success != true) {
        strOut.append(rest.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // 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.
    CkStringBuilder sbToken;
    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());

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

    // To delete a message, we'll need either the SequenceNumber or MessageId.
    // When the message was peek-locked, the SequenceNumber and MessageId of the locked message
    // was returned in the HTTP response header named "BrokerProperties, which contained
    // JSON such as the following:
    // 
    // 	{
    // 	  "DeliveryCount": 1,
    // 	  "EnqueuedSequenceNumber": 3000004,
    // 	  "EnqueuedTimeUtc": "Wed, 07 Dec 2016 17:42:48 GMT",
    // 	  "Label": "M3",
    // 	  "LockToken": "6eeee205-e541-4cb6-95fb-4c81da5f6858",
    // 	  "LockedUntilUtc": "Thu, 08 Dec 2016 00:57:32 GMT",
    // 	  "MessageId": "e8028116d63c43f191577f2789b1cca7",
    // 	  "SequenceNumber": 4,
    // 	  "State": "Active",
    // 	  "TimeToLive": 922337193600
    // 	}
    // 
    // 
    // The path for unlocking a message is constructed as follows, depending on
    // whether it is a message on a queue or subscription:
    // 
    // (for a queue)
    // /{queuePath}/messages/{messageId|sequenceNumber}/{lockToken}
    // 
    // (for a subscription)
    // /{topicPath}/subscriptions/{subscriptionName}/messages/{messageId|sequenceNumber}/{lockToken}

    // This example will build a path to delete a message contained in a subscription.
    const char *topicName = "gilaMonster";
    const char *subscriptionName = "feedings";
    const char *messageId = "e8028116d63c43f191577f2789b1cca7";
    const char *lockToken = "6eeee205-e541-4cb6-95fb-4c81da5f6858";

    // Build the path..
    CkStringBuilder sbPath;
    sbPath.Append("/{topicPath}/subscriptions/{subscriptionName}/messages/{messageId|sequenceNumber}/{lockToken}");
    int numReplaced = sbPath.Replace("{topicPath}",topicName);
    numReplaced = sbPath.Replace("{subscriptionName}",subscriptionName);
    numReplaced = sbPath.Replace("{messageId|sequenceNumber}",messageId);
    numReplaced = sbPath.Replace("{lockToken}",lockToken);

    // Add a timeout parameter.
    rest.AddQueryParam("timeout","20");

    // Use the DELETE HTTP verb to delete the message.
    CkStringBuilder sbResponseBody;
    success = rest.FullRequestNoBodySb("DELETE",sbPath.getAsString(),sbResponseBody);
    if (success != true) {
        strOut.append(rest.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    strOut.append("Response Status Code = ");
    strOut.appendInt(rest.get_ResponseStatusCode());
    strOut.append("\r\n");

    // Check for a success response.
    if (rest.get_ResponseStatusCode() != 200) {
        strOut.append(rest.lastRequestStartLine());
        strOut.append("\r\n");
        strOut.append(rest.lastRequestHeader());
        strOut.append("\r\n");
        strOut.append(sbResponseBody.getAsString());
        strOut.append("\r\n");
        strOut.append("Failed.");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // If successful, the response body would be empty..
    strOut.append("Success.");
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }