(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 <C_CkRest.h>
#include <C_CkStringBuilder.h>

void ChilkatSample(void)
    {
    HCkRest rest;
    BOOL bAutoReconnect;
    BOOL success;
    const char *queueName;
    HCkStringBuilder sbToken;
    HCkStringBuilder sbPath;
    HCkStringBuilder sbResponseBody;
    const char *message;

    // 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.
    rest = CkRest_Create();
    bAutoReconnect = TRUE;
    success = CkRest_Connect(rest,"<yournamespace>.servicebus.windows.net",443,TRUE,bAutoReconnect);
    if (success != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        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";
    queueName = "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.
    sbToken = CkStringBuilder_Create();
    CkStringBuilder_LoadFile(sbToken,"qa_data/tokens/serviceBusSas.txt","utf-8");

    // Tell the REST object to use the Azure Shared Access Signature for authorization.
    CkStringBuilder_Prepend(sbToken,"SharedAccessSignature ");
    CkRest_AddHeader(rest,"Authorization",CkStringBuilder_getAsString(sbToken));

    // Build the path..
    sbPath = CkStringBuilder_Create();
    CkStringBuilder_Append(sbPath,"/");
    CkStringBuilder_Append(sbPath,queueName);
    CkStringBuilder_Append(sbPath,"/messages/head");

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

    // Use the DELETE HTTP verb to read the message at the head of the queue and remove it.
    sbResponseBody = CkStringBuilder_Create();
    success = CkRest_FullRequestNoBodySb(rest,"DELETE",CkStringBuilder_getAsString(sbPath),sbResponseBody);
    if (success != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        CkStringBuilder_Dispose(sbToken);
        CkStringBuilder_Dispose(sbPath);
        CkStringBuilder_Dispose(sbResponseBody);
        return;
    }

    printf("Response Status Code = %d\n",CkRest_getResponseStatusCode(rest));

    // Check for a success response.
    if (CkRest_getResponseStatusCode(rest) != 200) {
        printf("%s\n",CkRest_lastRequestStartLine(rest));
        printf("%s\n",CkRest_lastRequestHeader(rest));
        printf("%s\n",CkStringBuilder_getAsString(sbResponseBody));
        printf("Failed.\n");
        CkRest_Dispose(rest);
        CkStringBuilder_Dispose(sbToken);
        CkStringBuilder_Dispose(sbPath);
        CkStringBuilder_Dispose(sbResponseBody);
        return;
    }

    // If successful, the message is the contents of the response body.
    message = CkStringBuilder_getAsString(sbResponseBody);
    printf("Dequeued message: %s\n",message);

    printf("Success.\n");


    CkRest_Dispose(rest);
    CkStringBuilder_Dispose(sbToken);
    CkStringBuilder_Dispose(sbPath);
    CkStringBuilder_Dispose(sbResponseBody);

    }