Calling C# .NET methods from unmanaged C/C++ code

Question

I need to call c# method in native c++. I followed this guide, download it, it's worked, but when I try it on new version of .net I cannot reproduce. The main idea of this code is call c# method in such way: C# .dll -> C++/CLI(managed c++) -> c++

C#

public static class ManagedClass
    {
        public static bool Check()
        {
            return true;
        }
    }

Managed c++

namespace ClassLibrary1 {

    public ref class DoWork
    {
    public: bool CheckCSharp()
    {
        return CSharp::ManagedClass::Check();
    }
    };
}
__declspec(dllexport) bool Check()
{
    ClassLibrary1::DoWork work;
    return work.CheckCSharp();
}

c++

#include "ClassLibrary1.h"
_declspec(dllexport) bool Check();

int main()
{
    std::cout << Check();
    system("pause");
    return 0;
}

It's show error

Error LNK2019 unresolved external symbol "bool __cdecl Check(void)" (?Check@@YA_NXZ) referenced in function _main

1 unresolved externals

In your unmanaged project setting, you will need to reference the ManagedDll.lib file. The linker error says that you didn't take care of that. — Hans Passant
– Hans Passant, Commented Mar 20, 2019 at 8:37
@HansPassant But when I include header, this mean it's in the same directory, then it should be along with it, or not? I created an empty ClassLibrary1.h in native c++ — Adam Hodovanets
– Adam Hodovanets, Commented Mar 20, 2019 at 8:47
A .h file can only take care of the declaration, it doesn't tell the linker what to do. This is a detail that doesn't exist in C#, it doesn't use a linker and adding a reference to an assembly is enough to keep it happy, but needs to be taken care of explicitly in C++. — Hans Passant
– Hans Passant, Commented Mar 20, 2019 at 9:19

Adam Hodovanets · Accepted Answer · 2019-03-20 13:01:08Z

1

enter image description here must write in linker path to .lib

edited Mar 20, 2019 at 13:01

Adam Hodovanets

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answered Mar 20, 2019 at 12:58

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