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Creating a C++ DLL to use with FoxPro
Message
Information générale
Forum:
Visual FoxPro
Catégorie:
Fonctions Windows API
Divers
Thread ID:
00048334
Message ID:
00050949
Vues:
53
Hi Rick,

You may want to try using Microsoft's ATL library for creating COM objects. It's relatively easy to create lightweight COM objects that can be instantiated in VFP. I have recently created a class which I use for doing date conversions. I have found that a simple COM object takes about a sixth of the time it takes to instantiate a native VFP Custom class.
Calling methods and accessing properties is straightforward and the marshalling that is done during automation calls makes it easy to pass strings between VFP and C++.

Darrel

>The other question is what if I have a C++ (instead of C) program, and I want to make a DLL out of it to call from FoxPro. Is it possible? If so, how?
>
>You can't call C++ objects or methods directly from VFP due to the fact that
>C++ mangles names and requires stackframes that VFP can't access.
>
>What this means is that you should write a wrapper around any C++ code that
>handles the class instantiation and calling of methods. This true for any
>API access, really. Only other C++ programs typically can call C++ classes
>directly and even then you have to go through all sorts of girations to
>get the nameing conventions to sync.
>
>+++ Rick ---
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