Guidance to create C++ DLL


I am new to C++ programming.  We have some C source code which needs to be converted into a C++ DLL.  They are a bunch of C files (.c extension) with each file having a main function and each file including lot of header files (.h extension)

I need a single C++ DLL with methods exposed which will be called from VB.  Which is the best way to do it?

Also we need cross platform compatibility.  Can I use VC++ as it will be more easier for me rather than using C++.

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Here are some tutorials

If you have specific questions after reading the tutorial then feel free to revert back.
I am wriiting here a small dll which can be accessible from vb/vc++ .
Exporting only two functions from this dll.

int sum(int x,int y);

int sub(int x,int y);

int sum(int x,int y)
return x+y;
int sub(int x,int y)
return y-x;

LIBRARY  Arithmatic
    sum @1
    sub  @2

build this dll and make use of this frm vc++/vb..hope this will helps u.

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gulabiAuthor Commented:
Thanks for the posts!

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