[fpc-pascal]Create an OCX with FreePascal

Cabuzel Thierry Thierry.Cabuzel at gial.be
Thu Oct 11 15:35:14 CEST 2001

> -----Original Message-----
> From: Dirk Mattes [mailto:Dirk.Mattes at unitedplanet.de]
> Sent: jeudi 11 octobre 2001 15:00
> To: fpc-pascal at deadlock.et.tudelft.nl
> Subject: AW: [fpc-pascal]Create an OCX with FreePascal
> Hi all,
> > Michael Van Canneyt wrote:
> > > 
> > > I don't know what the OCX format is, if it is a simple 
> > .dll, then it should
> > > be possible.
> > 
> > an OCX is a DLL, which follows some special convention 
> (exportet names
> > etc.). Writing an ActiveX Control by hand should be 
> possible with FPC,
> > but it isn't trivial, as you have to implement a lot of COM 
> > interfaces.
> > I think Visual C++ or the Platform SDK come with some 
> examples how to
> > write such a thing by hand, they should translate to FPC quite
> > straightforwardly.
> to write COM-Objects in FPC is possible and not difficult too much. 
> But an OCX (ActiveX-Control) is a problem, cause has to do with
> OLE-Automation. Like Michael says, you have to implement many 
> interfaces
> (i.e. IDispatch for late-binding your methods, IEnumVARIANT 
> and others),
> that Delphi or VC creates automaticly or Automation gives you in order
> to you type library. Most of your interfaces have to be 
> comaptible with
> OLE-Automation. You also have to convert many Header files 
> for constants
> that OLE uses (like VT_DISPATCH and many others).
> So, forget about it an use Delphi or VC.

Arg, that's what I doesn't want to hear. But more I read answer from my
post, more I feel that's will be the final answer. I think i will go to
create a DLL in FP, then write an wrapper OCX in Delphi if I found someone
who have Delphi...

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