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A Web service is an application that exposes a programming interface to remote callers over the Web. Unlike alternative remoting models, such as DCOM and CORBA, Web services offer a simple, scalable model based on industry standards such as XML/ SOAP. SOAP, in turn, uses HTTP as the transport layer to move structured type information across the Internet. (SOAP version 1.1 opened the possibility of using other Internet protocols as transport layers.) SOAP messages are essentially one-way transmissions, but can be combined to create a request/response conversation model suited to remote method invocation. SOAP data is encapsulated for transmission in a SOAP envelope which is basically an XML document containing the structured data to be transmitted. Developing XML Web services and clients does not necessarily require an understanding of SOAP, although it doesn t hurt. Using ASP.NET, developing the service can be as simple as coding a C#, or Visual Basic .NET class and deploying it on IIS. Microsoft IIS and the ASP.NET infrastructure look after compiling the source, building a WSDL contract which describes the service, forwarding client calls to the service, and returning results. (We ll look at ASP.NET in more detail in chapter 8.) The .NET SDK, and Visual Studio .NET, both provide tools to query the WSDL contract, and generate a proxy class to be used in compiling client applications.

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Place the insertion point where you want to add the field. Choose Insert, Field. The Field dialog box appears. Choose the field you want to add. Specify any necessary field options in the Field dialog box. Click the Field Codes button in the lower left corner of the dialog box. The Advanced Field Properties section of the Field dialog box appears, as shown in Figure 31-4.

Figure 31-4. You can type field arguments in the Advanced Field Properties sec tion of the Field dialog box.

in the Advanced Field Properties area. (See the next section for additional information on how to specify switches for your field codes.)

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Switches are special codes that change the way the field codes in your document act. There are two types of switches: general switches, which control the way the results of your field are formatted or displayed, and specific switches, which relate directly to the type of field you re using. Table 31-2 gives you an overview of the general switches you ll use with Word s field codes.

Without further delay, let s create our first Web service. We ll develop a simple service that accepts the caller s name and returns a greeting. We ll be installing our Web services on IIS, so we ll need a virtual directory on the Web server. Call this new virtual directory ws (for Web services) and remember to assign it permission to execute scripts.

Table 31-2.

delegate string LongCalculationDelegate( int count );

31

\* \#

Changes the way field {AUTHOR \* Lower} results are displayed Specifies format settings for displaying a numeric result {NUMPAGES \# 0 }

Creating the service Web services are stored on the server in files with a .asmx extension. These files are a bit like .asp files and can contain server directives and C# code. You can also use the CodeBehind directive to place the C# code in a separate file, as Visual Studio .NET does when you create a new Web service project. We don t bother to do this for the simple examples shown here.

{PRINTDATE \@ MMMM d, yyyy } Specifies the formatting for the display of a date, time, or picture Locks a BOOKMARK, {BOOKMARK C:\\Text\Myreport.doc \!} INCLUDETEXT, or REF field, keeping it from being updated

The general switches shown in the preceding table will not work with the following fields: AUTONUM, AUTONUMGL, AUTONUMOUT, EMBED, FORMTEXT, TA, TC, XE, EQ, GOTO BUTTON, MACROBUTTON, RD, FORMCHECKBOX, FORMDROPDOWN, and LISTNUM. You ll be able to use field-specific switches with some of these fields, however.

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