Calling c++ dll from c#

Question

**unmanaged class**

this is the unmanaged class declaration

#ifdef EXPORT_CLASS #define DLL_EXPORT __declspec(dllexport) #else #define DLL_EXPORT __declspec(dllimport) #endif public class DLL_EXPORT cppclass { private: string x; public: cppclass(); ~cppclass(); string native(); }; **UNMANAGED CLASS DEFINITION**

this is the unmanaged class definition

 cppclass::cppclass() { x="hello"; }; cppclass::~cppclass() { }; string cppclass::native() { return x; }; **MANAGED CLASS**

this is the managed class declaration

public __gc class Mclass { //private: public: cppclass * obj; public: Mclass(); ~Mclass(); string native();

};

**MANAGED CLASS DEFINITION**

//this is the managed class definition

#include"managed.h" Mclass::Mclass() { obj=new cppclass(); }; Mclass::~Mclass() { delete obj; }; string Mclass::native() { return obj->native(); };

All these four files are in a project which is made into a dll.Now how to use it in a c# project

The snippet is very incomplete. The Mclass must be declared public ref class so it is visible outside of the assembly. And you must implement a finalizer so you don't leak memory when the client code doesn't call Dispose(). And your native() method should check if obj wasn't deleted. — Hans Passant
– Hans Passant, Commented Feb 9, 2012 at 13:11
@HansPassant:your help is highly appreciated....will try to post complete snippets in future for clarity.... — manu_dilip_shah
– manu_dilip_shah, Commented Feb 9, 2012 at 14:25

Simon · Accepted Answer · 2012-02-09 12:15:15Z

5

Add a reference to the DLL in your C# project and simply use it like any .NET type. Probably you don't find any exported types in the DLL, because these have to be public.

Edit: BTW. i hope you're talking about C++/CLI, not Managed C++ which was prior to C++/CLI.

edited Feb 9, 2012 at 12:15

answered Feb 9, 2012 at 12:09

Simon

1,5148 silver badges11 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Botz3000 Over a year ago

Classes don't have to be in a namespace though AFAIK

manu_dilip_shah Over a year ago

@Simon yup i am talking about C++/CLI.Can you please elaborate a little with an example

Security Hound Over a year ago

@ManuDilipShah - You should be able to simply add the reference to the compiled C++/CLI file to your project. You wanting example makes no sense. If you have a new question, start a new question, post a better sample application when you do.

Ben Voigt · Accepted Answer · 2012-02-10 04:47:14Z

1

This whole thing is a disaster. That isn't C++/CLI code, it's the old Managed Extensions for C++ which are broken. Also, exporting native classes from DLLs is a really bad idea. Statically link your native code with the managed class definition, creating a single DLL.

answered Feb 10, 2012 at 4:47

Ben Voigt

286k45 gold badges444 silver badges764 bronze badges

2 Comments

manu_dilip_shah Over a year ago

sorry for the confusion....the native code along with the managed class definition are in a project which together creates a dll

Ben Voigt Over a year ago

@Manu: Ok, that's good. You should nuke all the EXPORT_CLASS and __declspec(dllexport) stuff then, it's just begging for someone to turn it on and cause trouble.

Collectives™ on Stack Overflow

Calling c++ dll from c#

2 Answers 2

3 Comments

2 Comments

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

2 Comments

Related