By Schaffer, Deon; Smith, Eric A.; Seely, Scott
Subject matters lined in developing and eating internet companies in visible simple contain: ''Quick Start'' that steps clients via developing and eating internet prone utilizing VB.NET; an summary of ways to transform legacy purposes to an online prone platform; safety, availability, nation upkeep, and synchronous vs. asynchronous processing concerns with regards to internet providers; and complex subject matters akin to the cleaning soap specification, VB6 and Soap-on-a-Rope, and troubleshooting suggestions
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SOAP uses the Fault element to communicate those errors. When a SOAP Fault is present, it must appear in the SOAP Body. This is true if a Header element is not understood or if the Body has something messed up. Fault elements have the following sub-elements: faultcode States why the fault occurred. It is meant to be used by other machines to algorithmically determine what went wrong. This element is required. faultstring Provides a human readable explanation of the faultcode. This element is required.
Because you will rarely have to concern yourself with the particulars, you can concentrate on developing good, solid code. You can easily pass around simple and complex types, as well as arrays. In this chapter, we tested the various functions by using the HTTP/GET interface. Web Services can typically be accessed via HTTP/GET, HTTP/POST, and SOAP. The rest of the book will concentrate on talking to Web Services using SOAP. The messages are slightly different from what we showed here. We will look at the SOAP messages being exchanged between the client and server.
With this code in place, let's experiment with the application itself. Build the application (go to the Build menu and select Build). Then, select Debug, Start. With the application running, experiment and see how it works. 8 shows the results of one run on my machine. 8. Chapter2GUI at work. Before going on to the next example, we will also look at what the SOAP message exchange looked like. You may want to compare this with the request and response done with the HTTP/GET Web request listed in Chapter 1.
Creating and consuming Web services in Visual Basic by Schaffer, Deon; Smith, Eric A.; Seely, Scott