(Unicode C++) Azure Service Bus - Read Queued Message

See more Azure Service Bus Examples

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

For more information, see https://docs.microsoft.com/en-us/rest/api/servicebus/receive-and-delete-message-destructive-read

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#include <CkRestW.h>
#include <CkStringBuilderW.h>

void ChilkatSample(void)
    {
    // 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.
    CkRestW rest;
    bool bAutoReconnect = true;
    bool success = rest.Connect(L"<yournamespace>.servicebus.windows.net",443,true,bAutoReconnect);
    if (success != true) {
        wprintf(L"%s\n",rest.lastErrorText());
        return;
    }

    // ----------------------------------------------------------------------------------------------
    // 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";
    const wchar_t *queueName = L"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.
    CkStringBuilderW sbToken;
    sbToken.LoadFile(L"qa_data/tokens/serviceBusSas.txt",L"utf-8");

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

    // Build the path..
    CkStringBuilderW sbPath;
    sbPath.Append(L"/");
    sbPath.Append(queueName);
    sbPath.Append(L"/messages/head");

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

    // Use the DELETE HTTP verb to read the message at the head of the queue and remove it.
    CkStringBuilderW sbResponseBody;
    success = rest.FullRequestNoBodySb(L"DELETE",sbPath.getAsString(),sbResponseBody);
    if (success != true) {
        wprintf(L"%s\n",rest.lastErrorText());
        return;
    }

    wprintf(L"Response Status Code = %d\n",rest.get_ResponseStatusCode());

    // Check for a success response.
    if (rest.get_ResponseStatusCode() != 200) {
        wprintf(L"%s\n",rest.lastRequestStartLine());
        wprintf(L"%s\n",rest.lastRequestHeader());
        wprintf(L"%s\n",sbResponseBody.getAsString());
        wprintf(L"Failed.\n");
        return;
    }

    // If successful, the message is the contents of the response body.
    const wchar_t *message = sbResponseBody.getAsString();
    wprintf(L"Dequeued message: %s\n",message);

    wprintf(L"Success.\n");
    }