ASP.NET Web PDF Document Viewer/Editor Control Library

Figure 10-3. Invoking a local web service Invoking this service with the arguments 46 and 28 produces the following XML: < xml version="1.0" encoding="utf-8" > <int xmlns="http://strangelights.com/FSharp/Foundations/WebServices">74</int>

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It is generally not efficient to send small amounts of data across the network, since there is a certain amount of metadata that must be sent with each request In general, it is better to build applications that are not chatty, that is, applications that make one big request rather than repeatedly making lots of small ones A web service will attempt to serialize any NET object that is returned from one for its methods to XML; however, the results can be a little unpredictable, and the resulting XML data might not contain all the fields you expect it to and might be difficult to work with from other programming languages To avoid this, it s best to use XSD schemas to define the objects that you want to pass across the web service.

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With breakpoints set, you re now ready to start actually debugging code. Venkman will automatically suspend execution once a breakpoint is encountered. At that point you re in control of the script s execution. You can inspect variable values, modify variable values, and continue the script execution, either by looking at one step at a time or by restarting execution and letting it run to completion. Venkman offers developers a few options for stepping through code once a breakpoint has been encountered. Once a breakpoint has been encountered, you can choose Continue, Step Over, Step Into, or Step Out, as shown in Figure 7-17.

An XSD schema is a type of XML document that describes the structure of an XML document, stating things like which fields are mandatory and the order in which the fields should appear These schemes then become part of the web service definition, and anyone using the web service will be able to understand what field they can expect from the web service This is preferable to simply defining a web service that has a single field containing binary or hexadecimal data because the user of the web service has a much better chance of understanding what the results mean Although it is possible to define your own XML schemas, Visual Studio has several graphic modes and a text-based mode for creating them; it s also possible to build on the work of others in this field many predefined schemas are available for download on the Web.

Figure 13-28. PCF8591 addressing The PCF8591 has several options that are configured by writing a control byte, and Figure 13-29 is a diagram of the control byte. The input Mode bits can be thought of as a single 2-bit number with values from 0 to 3.

The Continue option restarts script execution Execution will not end until either another breakpoint is encountered or the script completes The Continue option is useful when you need to track down the location of a problem You can set breakpoints at points along the execution chain and, each time a breakpoint is encountered, inspect variable values to see whether the problem has cropped up yet Once the problem appears, you know the error occurred somewhere between the current breakpoint and the previous breakpoint, and you can narrow it down further from there The Continue option is also useful when debugging an iteration You can set a breakpoint at one point within the iteration and use the Continue option to speed through the iterated code, checking every time that execution suspends whether any problems have occurred.

For instance, the example you are going to look at next uses RNAML, a schema you can find at http:// www-lbitiroumontrealca/rnaml/; it is one attempt to provide a schema for people who want exchange information on RNA (Ribonucleic acid, a substance studied by molecular biologist) in XML Once you have downloaded the schema from the site, you can turn this into a NET representation of the schema using the command-line tool xsdexe This tool produces C# classes that represent the XML data; typically, each tag in the XML will become a class in NET This C# file can then be compiled into a NET assembly and used from F# like any other NET library The complete command line you would use is xsd rnamlxsd /classes, and you need to rename the downloaded schema file from rnamlxml to rnaml.