using C function as C++ class method

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Hello,

I have a C function without a class. its just a function in a header file.

I want to expose it as managed code, so i am creating a new C++ file which had

C++

extern "C"
{
    #include "cfile.h"
}

public ref class managedClass
{
    public:
         ///// I want to expose the function from cfile.h
}

So i can use the managed code in C# like

C++

var test = managedClass.functionName(,,);

Posted 29-Apr-13 12:19pm

dangerkirthi

Updated 29-Apr-13 12:32pm

Philippe Mori

v2

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Philippe Mori 29-Apr-13 18:34pm

Not really a question. Just define a new function in your class and call the original one from the implementation possibly adjusting parameters for easier usage from .NET side.

Sergey Alexandrovich Kryukov 29-Apr-13 18:40pm

Right. Alternatively, it would be better to move the whole function into a "ref" class, if this is possible.
Will you just put your comment as a formal answer, to close the issue?
—SA

Philippe Mori 30-Apr-13 8:35am

The best solution depends a lot on existing code complexity (and if the code is used elsewhere). If the user has a single function then maybe P/Invoke from C# would be the best solution. If the function is very simple, rewitting it in C# might be the best choice...

Sergey Alexandrovich Kryukov 30-Apr-13 11:12am

Sure, agree.
—SA

Marius Bancila 30-Apr-13 7:19am

So you need to wrap the stand alone function with a member function? So what's the actual problem?

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KarstenK · Answer 1 · 2013-04-29T22:03:00

Solution 1

you only need to call the c-func in a member function. But you better do some error checking around it.

If you link the dll with "delayload" you will get some startup benefit.

Posted 29-Apr-13 22:03pm

KarstenK