Chilkat Examples

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Node.js Examples

ASN.1
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(Node.js) 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.

Install Chilkat for Node.js and Electron using npm at

Chilkat npm packages for Node.js

Chilkat npm packages for Electron

on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node11-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node11-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node11-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node11-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node11-linux64');
    }
} else if (os.platform() == 'darwin') {
    var chilkat = require('@chilkat/ck-node11-macosx');
}

function chilkatExample() {

    // 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.
    var rest = new chilkat.Rest();
    var bAutoReconnect = true;
    var success = rest.Connect("<yournamespace>.servicebus.windows.net",443,true,bAutoReconnect);
    if (success !== true) {
        console.log(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";
    var 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.
    var sbToken = new chilkat.StringBuilder();
    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());

    // Build the path..
    var sbPath = new chilkat.StringBuilder();
    sbPath.Append("/");
    sbPath.Append(queueName);
    sbPath.Append("/messages/head");

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

    // Use the DELETE HTTP verb to read the message at the head of the queue and remove it.
    var sbResponseBody = new chilkat.StringBuilder();
    success = rest.FullRequestNoBodySb("DELETE",sbPath.GetAsString(),sbResponseBody);
    if (success !== true) {
        console.log(rest.LastErrorText);
        return;
    }

    console.log("Response Status Code = " + rest.ResponseStatusCode);

    // Check for a success response.
    if (rest.ResponseStatusCode !== 200) {
        console.log(rest.LastRequestStartLine);
        console.log(rest.LastRequestHeader);
        console.log(sbResponseBody.GetAsString());
        console.log("Failed.");
        return;
    }

    // If successful, the message is the contents of the response body.
    var message = sbResponseBody.GetAsString();
    console.log("Dequeued message: " + message);

    console.log("Success.");

}

chilkatExample();

 

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