[fpc-pascal] IDispatch with Variant is not working on Linux. Why?

[Michael Van Canneyt]

On Wed, 1 Nov 2023, Anthony Walter via fpc-pascal wrote:

> Thank you Micahel,
>
> I was doing some research last night and found that there are two specific
> stubs in the System unit that are implemented by the ComObj unit.
> Specifically, a stub for safe call exception handling and dispatch invoke.

Yes, exactly.

I think the dispatch invoke callback/stub is in the variants unit: 
the VarDispProc procedural variable

> I was working with my example and added my own OS agnostic implementations
> of those two functions. This eliminated the access violations.
>
> I am not finished testing my solution, but in cases where late binding is
> desired, it ought to be possible to have it work on all platforms so long
> as the late binding is not attempting to cross process boundaries, which is
> common on Windows when using out of process servers such as Word or Excel.
> Perhaps my use case for late binding to a self contained scripting library
> might be useful for other people Free Pascal who do not run Windows. I am
> sure there are other possible use cases as well. In that light, it might be
> useful to integrate my eventual implementation into some unit included with
> FPC.

Indeed.

I would be very grateful if you donate it, it would be useful for all FPC users !

Michael.