ColdFusion WS Consumer for a WS Created in VS2003 - Second Example
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The web service that takes arguments
This service is a simple example from geometry. The two sides that make the right angle in a triangle are given and it is required to find the third side, called the hypotenuse. This theorem is attributed to Pythogoras, a Greek mathematician. The service accepts two arguments and returns the length of hypotenuse.
Step 1: We will abbreviate the steps as it follows a similar pattern to the one in the first example. Create a Web Service project, herein called SQRoot. Create an Asmx file called SQRUT. asmx. Insert the following code in the code page after removing the default, commented text as shown below. Observe that System.Math class has been imported. This class defines the Sqrt () method.
In this step a web service file has been created. You can find its WSDL as was shown previously. The WSDL file for this service is found at the URL: http://localhost/SQRoot/SQRUT.asmx?Wsdl
The Consumer using ColdFusion
Step 2: Create a ColdFusion file as shown below. ColdFusion special tags, <cfinvoke/>, <cfinvokeargument name="" value=""/> are used to call the web service from its URL and supply arguments with the "invoke argument" tags. The tag <cfinvoke> can be either a component, or a web service that starts looking for functions defined therein. This function is named CF_SQRUT.cfm in this tutorial.
<cfinvoke
webservice="http://localhost/SQRoot/SQRUT.asmx?Wsdl"
method="hypotenuse"
returnvariable="hypotenuse">
<cfinvokeargument name ="x" value="3"/>
<cfinvokeargument name="y" value="4"/>
</cfinvoke>
<cfoutput>
Hypotenuse of the triangle is :
#hypotenuse#
</cfoutput>
Step 3: Upload the code to the root directory, or copy and paste to a suitable folder in your web root folder. When you browse this file, you will see the following displayed.
Summary
Interoperability is the mantra of web services. In an ideal world, any machine on the internet working with any kind of platform and language should be able to access the web service on the Internet. The technology is moving towards this ideal situation. This tutorial shows how to create web services easily with VS2003 IDE and consume these with code written in ColdFusion.
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