ColdFusion Developer's Guide

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Beta Beta Beta Beta Beta Beta Beta Beta Beta Beta You can use the cfobject tag or CreateObject function to create a reference to a .NET class object, by specifying either .NET or dotnet as the object type. You use the reference to access the .NET class fields and call the .NET class methods. This technique provides a tightly coupled, stateful, efficient method for accessing .NET classes from ColdFusion. As an alternative, your .NET application could make the class methods available as web services; however, using a web service is less reliable, has lower performance, and is less scalable than using ColdFusion objects for the .NET classes. NOTE .NET applications cannot access ColdFusion component functions directly. You can make the functions available as web services by specifying remote access. For more information on creating ColdFusion web services, see Chapter 47, “Using Web Services,” on page 1291. Because you use the .NET assembly classes the same way you use any other ColdFusion object, you do not have to understand the details of .NET technology; you only have to understand how to use the specific .NET class that you are accessing. Code that uses a .NET method could be as simple as the following lines: ColdFusion .NET access has the following additional features: ■ If you make a change in the .NET assembly, ColdFusion automatically recognizes the change and uses that version for the next invocation. ■ Your application can access .NET assemblies running on multiple machines. ■ You can secure the communication between ColdFusion and .NET by using SSL. ■ Primitive data types are automatically mapped between ColdFusion and .NET data types. How .NET access works For ColdFusion to access .NET assemblies, ColdFusion .NET extension software must run on the system that hosts the assemblies. A ColdFusion system that accesses only remote assemblies does not require the .NET extension. The .NET extension software provides the .NET-side connectivity features that enable access to .NET assemblies, including a .NET-side agent (which normally runs as the Scorpio .NET Windows service) that listens for and handles requests from the ColdFusion system. 1364 Using Microsoft .NET Assemblies
Beta Beta Beta Beta Beta Beta Beta Beta Beta Beta On the ColdFusion system, the ColdFusion objects use Java proxies that act as local representatives of the .NET classes. These proxies use binary TCP or SOAP-based HTTP communication to access a .NET-side agent. The agent then uses a DLL to invoke the .NET assembly classes. This communication is required in all cases, even if ColdFusion and the .NET assemblies are on the same system. The following diagram shows how CFML-to-.NET access works: Invokes Uses CFML Page Java Proxy JNBCore.jar (installed on all ColdFuson systems) ColdFusion Side Application view TCP/Binary or HTTP/SOAP communications both sides can be on a single system .NET Assembly Invokes JNBShare.dll JNBDotNetSide. exe.config Specifies assembly classes JNBDotNetSide.exe (runs as a Windows service) .NET Side If your .NET assemblies are on the local system, ColdFusion automatically creates and manages all required proxies and configuration information. You must ensure only that the .NET extension is installed on your system and that the Scorpio .NET Service is running; you can use the cfobject tag or CreateObject function to access the assemblies without any additional steps. Uses About ColdFusion and .NET 1365
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Beta Contents Introduction . . . .
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Beta Chapter 8: Creating ColdFusion
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Beta About resource and sandbox sec
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Index A access client variables 412
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authentication application-based ex
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cfexit tag about 43 behavior of 296
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SetVariable 103 StructClear 134 Str
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caching 1144 curve chart considerat
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web services and 1306 when to use 2
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forms for updating 584 insert form
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adding custom header 1428 attachmen
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in user-defined functions 222 infor
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esponding to messages from ColdFusi
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Internet applications 19 ColdFusion
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functions for 502 generating multi-
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described 1539 example 1544 onIncom
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unions 609 user guide 609 using 599
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text 1470 retrieving, e-mail messag
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about 37, 74, 324, 400, 404, 417 bu
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web services, consuming 1319 web se
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V validating data types 83 form fie
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type conversions 1304 web services,
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