Tutorials » Creating a Web Service using ActiveX Components

Now that we have all the pieces we need, simply create a new application in MTS and add the two components or register them user regsvr32. Once this is complete we can now use our ASP interface to enter a number and retrieve our answers.

Here is what the outgoing SOAP message will look like:

<SOAP-ENV:Envelope xmlns:SOAPSDK1="http://www.w3.org/2001/XMLSchema" xmlns:SOAPSDK2="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAPSDK3="http://schemas.xmlSOAP.org/SOAP/encoding/" xmlns:SOAP-ENV="http://schemas.xmlSOAP.org/SOAP/envelope/">
    <SOAP-ENV:Body>
        <Functions:CalcFactorial xmlns:Functions="uri:Math">
            <Functions:Number>10</Functions:Number>
        </Functions:CalcFactorial>
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

Here is the response SOAP message:

<SOAP-ENV:Envelope xmlns:SOAPSDK1="http://www.w3.org/2001/XMLSchema" xmlns:SOAPSDK2="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAPSDK3="http://schemas.xmlSOAP.org/SOAP/encoding/" xmlns:SOAP-ENV="http://schemas.xmlSOAP.org/SOAP/envelope/">
    <SOAP-ENV:Body>
        <Functions:CalcFactorialResponse xmlns:Functions="uri:Math">
            <Functions:Answer>3628800</Functions:Answer>
        </Functions:CalcFactorialResponse>
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

As you can see this was a very simple example of a XML Web Service application that utilizes Microsoft's SOAP Toolkit. Although simple to implement, this article illustrates a very exciting and powerful point: SOAP and XML Web Services allow you to make remote calls to objects. This technology allows you to provide rich business functionality across a distributed environment without requiring a programming language upgrade. Even though .NET is an exciting and powerful tool, if your environment isn't ready for the jump, you don't have to be left in the cold.

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