I found the example for mixing Fasm with C code but there isnt example in it
for what i want to do.

I wanna declare this in Fasm to get its value in C.


So i go like this in Fasm:

but it wont compile.

In C I'd like it to be an int:

If you use "public MyVar as '_MyVar' " instead it will compile and AFAIK it will link with your C object despite the type-less nature of the symbol.

Thanks for the answer LocoDelAssembly!

No it wont compile that way either.

But i found out what i missed in the example code and now it compiles like this:



But i cant seem to access it in C.

I get "error LNK2019: unresolved external symbol "int MyVar"" error.

Is there any relation of the size that i declared it as DD in fasm and INT in C?

Can it be the problem?

Have you tried without the underscore and adding one more?

No, but i found it:



This is it. Now i have access.

One more question though:

Do i still need to invoke ExitProcess in the fasm code when i link it with C ?

If you have the "C" main() procedure as the entry point, your compiler will include all the exit routines to properly terminate the program. Check it in a dump of the linked executable.

It sounds like you are really using C++ (not C)
So for it to work under either language you could do this...

Thanks a lot Pelaillo and Bitshifter!

You might be interested in http://en.wikipedia.org/wiki/Name_mangling#How_different_compilers_mangle_the_same_functions, it explains the reason you need to use "extern 'C'" on that page also. Name mangling is really unstandardized for C++.