Question

I’m working on a dll that is loaded in application A, I want to share interface/object(s) between application A and another application B, so, here’s the idea:

[foreign application A] <- [my dll] <-> [my application B]

Ideally would be to “somehow” reroute functions in the dll to [my application B]

I’m interested in an elegant solution, one that wouldn’t require too much compromise, thoughts?

EDIT:
[application A] is written in C, [my dll] and [application B] are written in the same delphi version.

Answer 1

Why don’t you expose an automation interface in [My Application B] which [My DLL] can access and forward function calls on to?

[My Application B]

IMyRemoteInterface = interface(IDispatch)
    ... Ole interface functions here ...
end;

TMyRemoteInterfaceImpl = class(TAutoObject, IMyRemoteInterface)
    ... Implementation gubbins ...
end;

and then

[My Application C]

Server = CreateOleObject(MyApplicationB.MyRemoteInterface)
....
Server.DoStuff

Obviously there’s more to it than that, but you get the gist.