Re: VCL components in DLL

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#9235

From: Remy Lebeau (TeamB)
Date: Mon, 19 Jul 2004 18:51

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"Pere Mateu" <pmateu@siam.es> wrote in message
news:40fbfe0c$1@newsgroups.borland.com...

> I'm trying to embed some VCL components in a DLL. I want
> to show these components in the main form of my app by -after
> succesfully getting a pointer to the VCL component- changing
> the Parent property from the form in the DLL to the form in the
> main EXE.

Use a package instead of a DLL.  A Package is a special kind of DLL that has
native VCL support built in.  A basic DLL does not have that.

> But this is not working. I get assignment errors like 'Can not
> assign a TFont to a TFont'.

The DLL has different RTTI (runtime time information) than the Application
does, thus things like TPersistent::Assign() and dynamic_cast fail when
testing pointers across the DLL boundary.


Gambit

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Subject: Re: VCL components in DLL
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