Re: Plugin Enabled Applications
From: Peter Below (TeamB) (100113.1101_at_compuXXserve.com)
Date: 10/24/03
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Date: Fri, 24 Oct 2003 20:42:45 +0200
In article <3f993010@newsgroups.borland.com>, NightWalk wrote:
> I want to include plug-in support into my application. I don't know where
> should i start and there is some design questions in my mind. For example,
> is plug-in system useful for every kind of code modules ? Which should i
> choose packages or DLLs.. Can you give me a roadmap about to develop plug-in
> enabled applications in Delphi ?
If you can live with a Delphi-only solution use packages.
Plugin frameworks
http://www.uil.net/uProducts/TheUILPluginFramework.html
http://www.athrasoft.com (SmartPlugin)
Runtime Packages Frame Work
http://www.obsof.com/delphi_tips/delphi_tips.html
http://jvcl.sourceforge.net/ has plugin stuff as well
If you need to support plug-ins written in other languages you have to use
DLLs. Define an interface between plug-in DLL and app in terms of a set of
COM interfaces, e.g. DLL has to export a function of name GetPlugin that
returns an interface reference of type IPLugin (which you define). One method
of this interface can be used to pass an interface from the app to the DLL to
allow it to access certain functionality in the EXE. IPLugin would then offer
methods to create a plugin, for example, passing in a window handle to use as
parent (if the plugin should be a child of your host form instead of a
top-level window), and so on. If you stick to COM compatible data types and
calling conventions (stdcall or safecall if you use IDispatch-based
interfaces) most languages that can be used to build Windows apps will be
usable for plugin development.
-- Peter Below (TeamB) Use the newsgroup archives : http://www.mers.com/searchsite.html http://www.tamaracka.com/search.htm http://groups.google.com http://www.prolix.be
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