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Maxwell Script for .NET Plugins

Scripting the Maxwell Plugin

The plugin includes a library, Maxwell.Script.dll, which allows access to the current scene from VBA, VBScript, .Net, and any

other environment which is able to create and query .Net or COM objects.

The library is installed to the .Net Framework Global Assembly Cache when the plugin is installed. A separate copy is also

installed in the plugin's directory located @ [ProgramFiles]\MaxwellDotNET\Maxwell.Script. The library installer installs five

files at this location:

 Maxwell.Script.dll: this is the .Net class-library which contains the IScriptObject .Net Interface, which may be

Linked directly in .Net code

 Maxwell.Script.tlb: this type library is registered by the installer, to enable the library to be shown in the VBA

'Links' and Visual Studio 'Links/COM' dialogs. It may be used for COM interop, and provides a

definition for the IScriptObject COM interface

 Maxwell.Script.xml: provides IntelliSense in the Visual Studio IDE when Maxwell.Script.dll is referenced in a .Net

project

 register.bat: calls regasm.exe to register the Maxwell.Script.dll library for use in VBA, etc.

 unregister.bat: calls regasm.exe to unregister the Maxwell.Script.dll library

Methodology

The main scripting interface, IScriptObject, is implemented internally by Maxwell.Script.dll in the object ScriptObject.

ScriptObject's constructor is the only public entry-point to the library, as all other objects have no public constructor.

ScriptObject, is a very light-weight object - in fact, it has absolutely no data members, and exists purely as a static event

broadcaster. For this reason, as well as the fact that there may be any number of scenes in existence, it is not appropriate to

keep any global instance - clients should always create a new ScriptObject when one is needed to ensure they are working

with the current scene.

If ScriptObject is just a broadcaster, then there must also be a listener to do the actual work - this is implemented inside the

plugin. If no listener currently exists, then events will not be handled, and values will simply be set to default for their

parameter type. If however there is a listener, it will handle the raised events, getting or setting requested values as

necessary to establish a communication between clients and the current Maxwell scene - which is always hosted by the

event-listener (i.e. the plugin).

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RHINO network camera Manual do Utilizador Página 89