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Converting COM request to web service request

Kok Sing Khong (khongks@sg.ibm.com), IT Architect, IBM
Kok Sing Khong
Kok Sing is an IT Architect with Application Innovation Services, IBM Singapore. He is well-versed in various programming languages like C/C++, Java and C# and development platform like JEE and .NET. He holds a Master of Technology (Software Engineering) and a IBM Certified IT Specialist.

Summary:  Since its introduction, web service has become a standard mechanism for integration between applications. However, there are many applications written in languages that do not provide a strong support for web service - for example Visual C++ V6.0 or Visual Basic V6.0. One approach to enable these applications is to have an adaptor that can convert a request into a web service call. This tutorial describes how to develop this adaptor implemented as a DCOM server using C#. It basically receives a COM request and forward the request to a web service endpoint. It also provides steps on how to make a COM request in C++ and shows steps on how to implement a Java web service. In short, it demonstrates how web service interoperability on the .NET and JEE platform can be achieved. C# code is developed using Microsoft Visual Studio, while the web services is developed using Rational Application Developer V7.5 and deployed on the WebSphere Application Server V7.0 test environment.

Date:  12 Oct 2010
Level:  Intermediate
PDF:  A4 and Letter (648 KB | 22 pages)Get Adobe® Reader®

Activity:  5140 views
Comments:  

Before you start

About this tutorial

This tutorial details the following steps:

  1. Develop a Java-based web service using Rational Application Developer V7.5
  2. Develop a COM server using C# using Visual Studio 2008
  3. Develop a COM client using C; that calls the COM server
  4. Enable to COM to be accessible remotely (DCOM)

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Prerequisites

To develop the code, you need to following software:

  • Microsoft Visual Studio 2008
  • IBM Rational Application Developer for WebSphere Application Server V7.5

You can also choose to use IBM Rational Software Architect for WebSphere Application Server V7.5.

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System requirements

To run the examples in this tutorial, you need a Intel machine running Microsoft Windows XP or above, with at least 2GB of RAM and 300MB of of free disk space.

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TutorialTitle=Converting COM request to web service request
publish-date=10122010
author1-email=khongks@sg.ibm.com
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