CODEWITHSUNDEEP
c#c++wcfiisdll
Максим Ширяев
Максим Ширяев

Reputation: 1

How to connect native C/C++ *.dll to WCF C# hosted in IIS?

I need to connect the library native x86 C/C++ *.dll to the service WCF C# 4.0 hosted local in my computer(IIS7.5). I calling service method by http request (method [WebGet]). I get the error:

http://s1.ipicture.ru/uploads/20120509/H8TVURsE.jpg

DllNotFoundException was unhandled by user code

Can not load DLL Li.dll: Access denied (Exclussion from HRESULT: 0x80070005 (E_ACCESSDENIED))

Can you please tell what could be the problem?

The efficiency of the library Li.dll tested in a console application C # - working successfully.

Windows 7 x86 .NET 4.0 VS 2010 IIS7.5

Structure solutions service WCF:

http://s1.ipicture.ru/uploads/20120430/vBXivN71.jpg

Source Code

native C/C++ x86 Li.dll:

Li.h

extern "C" {
    __declspec(dllexport) int __cdecl SimulateGameDLL (int a, int b); 
}

Li.cpp

#include "Li.h"
extern int __cdecl SimulateGameDLL (int num_games, int rand_in) {
   return 121; 
}

C#

WcfServiceLibrary1.IService1

[ServiceContract] public interface IService1{
    [OperationContract][WebGet] string GetData();
}

WcfServiceLibrary1.Service1

public class Service1 : IService1{

public string GetData(){

    ClassLibrary1.Class1 cl = new ClassLibrary1.Class1();
    var rt = cl.M(); 
    return string.Format("Value = : {0}", rt);  
}
}

ClassLibrary1.Class1

public class Class1{

    [DllImport("Li.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]
    public static extern int SimulateGameDLL(int a, int b);

    public int M() {

        var r = SimulateGameDLL(10, 20);            
        return r;
    }
}

strong text

Upvotes: 0

Views: 1155

Answers (1)

paramosh
paramosh

Reputation: 2258

Might be you should grant access to user NETWORK SERVICE to access the dll file.

Upvotes: 1

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