Re: [Mingw-users] MinGW, MSVC7

[Michael G. <mg...@te...>]

> To help you with your problem:
> You can still write the majority of your code using C++, classes
> etc. (try to avoid exceptions). But you'll have to provide proxy
> functions that can be called from C if you wish to mix compilers.

Here is a simple example what I mean by 'proxy function'

A.hpp
=2D*- snip -*- snip -*- snip -*- snip -*- snip -*- snip -*- snip -*-
class A
{
public:
    A() {_a=3D0;}
    long getA() {return _a;}
    void setA(long l) {_a=3Dl;}
private:
    long _a;
}
=2D*- snip -*- snip -*- snip -*- snip -*- snip -*- snip -*- snip -*-

Aproxy.cpp
=2D*- snip -*- snip -*- snip -*- snip -*- snip -*- snip -*- snip -*-

#define MY_CLASS_A_DLL

include "Aproxy.h"

__declspec(dllexport) AHANDLE ACreate()
{
     return new A();
}

__declspec(dllexport) long AGetMemberA(AHANDLE aParm)
{
     A* a =3D (A*)aParm;
     return a->getA();
}

__declspec(dllexport) void ACreate(AHANDLE a, long l)
{
     A* a =3D (A*)aParm;
     a->setA(l);
     return;
}

typedef LHANDLE AHANDLE;
#ifdef __cpluspls
extern "C" {
#endif
// declare all proxy functions, e.g.
AHANDLE ACreate();
long AGetMemberA(AHANDLE ahnd);

#ifdef __cpluspls
}
#endif

#undef IMPORTAPI

=2D*- snip -*- snip -*- snip -*- snip -*- snip -*- snip -*- snip -*-

Aproxy.h
=2D*- snip -*- snip -*- snip -*- snip -*- snip -*- snip -*- snip -*-

#ifdef MY_CLASS_A_DLL
 #define IMPORTAPI __declspec(dllexport)
#else
 #define IMPORTAPI __declspec(dllimport)
#endif

typedef LHANDLE AHANDLE;
#ifdef __cpluspls
extern "C" {
#endif
// declare all proxy functions, e.g.
// (omit APIENTRY if you don't need it)
IMPORTAPI APIENTRY AHANDLE ACreate();
IMPORTAPI APIENTRY long AGetMemberA(AHANDLE ahnd);
IMPORTAPI APIENTRY long ASetMemberA(AHANDLE ahnd, long l);

#ifdef __cpluspls
}
#endif

#undef IMPORTAPI

=2D*- snip -*- snip -*- snip -*- snip -*- snip -*- snip -*- snip -*-


There are missing a few wistles and bells but I hope you get the idea.

Best,
Michael
=2D-=20
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 Michael Gerdau       email: mg...@te...
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