[Qt-interest] Question regarding plugins

[Jason H]

You have to develop an interface, which is a pure virtual class, so your apps need to have some idea of wht kind of functionality to expect.

You can abstract it further and provide a IUknown style interface, but your complexity will go up. Each plugin should implement one or more instances complying to an interface. You can have several interfaces supported, but you'll have to distinguesh the DLLs that implement one class in some way. 





----- Original Message ----
From: Anatoly Burakov <burakov.anatoly at googlemail.com>
To: qt-interest at trolltech.com
Sent: Tuesday, October 6, 2009 3:37:53 PM
Subject: [Qt-interest] Question regarding plugins

Hi all

I'm not sure if this is a QT-specific question (more of a general
programming one). But, anyway.

I am going to build an application which is able to use plugins to
extend its functionality. Let's say it's a business application, and
let's say one of the plugins provides application with current currency
rates. How can other plugins see that information, given the initial
application should have no idea about currency rates?

I mean - a currency rate is just a variable. What i am asking for is to
be able to access this variable from within another plugin. Is it
possible? My guess is that this implies dependency of one plugin on
another, but i am not sure how can i get exactly that variable (and not
some newly generated via initializing function of a plugin). So, how can
i achieve that? Just general guidelines is all i need, i'll figure out
implementation on my own.

Thanks in advance
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