[Qt-interest] Extending QT application - some design question

[Andreas Pakulat]

On 06.10.09 15:09:05, jjDaNiMoTh wrote:
> Hello to all,
> I've read the second part of the plugin how-to [1], where it explains how
> expand qt application through plugin. Now I've created my first test app,
> with a MainWindow that load some plugins (like the EchoPlugin example).
> 
> Now, if I try to define in the MainWindow class a test method ( foo() ) and
> try to execute it from plugin, the linker fails, saying the undefined
> reference of foo(). I can link togheter the MainWindow.o object file with
> the plugin object file, but in this way the plugin architecture doesn't make
> sense ( the MainWindow load a plugin that have linked another MainWindow
> object file ?!? ).
> 
> So, I want to make a plugin that use some already-defined functions, that
> live on another part of the program, without linking the plugin itself with
> the object that have the already-defined functions.
> 
> Is right my design model, or a plugin can't never never call an external
> function, but implements only what the MainWindow (in this case) want?

What you should do in this case is create a shared library to which both
the plugin and your main executable link and which provides the functions
that the plugin wants to use.

Andreas

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