Linking VC with Fortran

[ljc420]

I am currently working on a project that requires that I write a VC++ library that is called by a Visual FORTRAN (Compaq's) program. The resources that I have found say that it is relatively easy to do this, however they are not really specific about the details.

I have a class with about 6 functions that I want to make external. What do I need to do in order to change these functions to be able to be called from FORTRAN? I don't have to worry about the VFORTRAN code only the VC++ stuff. Also do I need to create any special kind of project (either ATL/COM or .dll)?

 

[Cagliostro]

just create a statically linked library John Fill

ivfmd@mail.md

 

[ljc420]

Yes, but don't I need to write something special in the code such that the FORTRAN program can access my functions.

My current function
void Class1::foo(int x, int y, char *something)
{
}

Do I need to add anything to this or will it be able to link to this fine? Also what file would the FORTRAN program link to (.obj, .pch, .tlb)?

 

[Cagliostro]

My advice is you to make your export functions as:

//foo implementing
void Class1::foo(int x, int y, char *something)
{
}
//export function for calling from fortran
void foo(void* handle, int x, int y, char *something)
{
((Class1*)x)->foo(x,y,something);
}
//use handles where is possible. John Fill

ivfmd@mail.md

 

[ljc420]

So out of curiousity will that change the way that the function is from the FORTRAN program?

 

[ljc420]

The way that the function is CALLED. Will that change the way that the function is called from FORTRAN?

Sorry I didn't get enough sleep last night.

 

[Cagliostro]

Yes, because of different kinds of coding and names conventions, calling conventions ... The most language independent is COM. So if you know COM you can make AtiveX DLL or EXE servers in ATL of MFC or make them just in ordinary DLL or EXE using COM API. John Fill

ivfmd@mail.md