Possible to call C++ code from C#?


Question

Is it possible to call C++ code, possibly compiled as a code library file (.dll), from within a .NET language such as C#?

Specifically, C++ code such as the RakNet networking library.

1
81
10/4/2017 9:09:31 PM

Accepted Answer

One easy way to call into C++ is to create a wrapper assembly in C++/CLI. In C++/CLI you can call into unmanaged code as if you were writing native code, but you can call into C++/CLI code from C# as if it were written in C#. The language was basically designed with interop into existing libraries as its "killer app".

For example - compile this with the /clr switch

#include "NativeType.h"

public ref class ManagedType
{
     NativeType*   NativePtr; 

public:
     ManagedType() : NativePtr(new NativeType()) {}
     ~ManagedType() { delete NativePtr; }

     void ManagedMethod()
      { NativePtr->NativeMethod(); } 
}; 

Then in C#, add a reference to your ManagedType assembly, and use it like so:

ManagedType mt = new ManagedType();
mt.ManagedMethod();

Check out this blog post for a more explained example.

85
3/7/2019 1:52:56 AM

P/Invoke is a nice technology, and it works fairly well, except for issues in loading the target DLL file. We've found that the best way to do things is to create a static library of native functions and link that into a Managed C++ (or C++/CLI) project that depends upon it.


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