从本机C++调用.NET dll

我使用COM包装器调用.NET dll(mclNET.dll(时遇到问题。这是我没有源代码的第三部分dll。基本上，我想在我的纯原生C++应用程序中使用这个mclNET.dll，所以我正在开发一个C#包装器MCLWrapper.dll，使mclNET.dll中的方法可见。以下是我所做的：

• 在MCLWrapper.dll中，我添加了mclNET.dll为引用，然后定义接口以使mclNET.dll方法可见。这是我的一些代码：

  using System;            
  using System.Collections.Generic;            
  using System.Linq;            
  using System.Text;           
  using mclNET;       
  namespace MCLWrapper       
  {            
       public interface MCLControl            
       {                
            void MCLConnect(string SerialNumber);                
            void MCLSet_Switch(string SwitchName, int Val);                
            void MCLDisconnect();         
       };
       public class MCLControlClass:MCLControl
       {
           private USB_RF_SwitchBox _sb = new USB_RF_SwitchBox();
           public void MCLConnect(string SerialNumber)
           {            
               _sb.Connect(ref SerialNumber);
           }
           public void MCLSet_Switch(string SwitchName, int Val)
           {
               _sb.Set_Switch(ref SwitchName, ref Val);
           }
           public void MCLDisconnect()
           {
               _sb.Disconnect();
           }
       }
   }
  

这是MCLWrapper.dll的AssemblyInfor.cs:

using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
// General Information about an assembly is controlled through the following 
// set of attributes. Change these attribute values to modify the information
// associated with an assembly.
[assembly: AssemblyTitle("MCLWrapper")]
[assembly: AssemblyDescription("")]
[assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("")]
[assembly: AssemblyProduct("MCLWrapper")]
[assembly: AssemblyCopyright("Copyright ©  2013")]
[assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")]
//[assembly: AssemblyKeyFile("..\MCLWrapper.SNK")]

// Setting ComVisible to false makes the types in this assembly not visible 
// to COM components.  If you need to access a type in this assembly from 
// COM, set the ComVisible attribute to true on that type.
[assembly: ComVisible(true)]
// The following GUID is for the ID of the typelib if this project is exposed to COM
[assembly: Guid("14fa8796-ee52-4e39-8481-f893ad92bb68")]
// Version information for an assembly consists of the following four values:
//
//      Major Version
//      Minor Version 
//      Build Number
//      Revision
//
// You can specify all the values or you can default the Build and Revision Numbers 
// by using the '*' as shown below:
// [assembly: AssemblyVersion("1.0.*")]
[assembly: AssemblyVersion("1.0.0.0")]
[assembly: AssemblyFileVersion("1.0.0.0")]

• 然后，在我构建了这个Wrapper.dll之后，我使用regasm命令注册了它，以生成.tlb文件

• 然后在我的原生C++应用程序中，我导入了tlb文件，并尝试使用Wrapper.dll，它引用了NET.dll

  #include "stdafx.h"
  #include "math.h"
  #include "DetectorSwitch.h"
  #include "DetectorSwitchSetupXML.h"
  #include "OleAuto.h"
  #import "C:/MyPath/MCLWrapper.tlb" raw_interfaces_only   
  wchar_t message[256];
  using namespace MCLWrapper;
  long DetectorSwitch::FindDevices(long &deviceCount)
  {
      long ret = TRUE;
      deviceCount=0;
         HRESULT hCoInitialize = CoInitialize(NULL);
      MCLControlPtr MySwitch(__uuidof(MCLControlClass));
      HRESULT hConnet = MySwitch->MCLConnect(_SN);    // connect to sc
      short output  = 1;
      MySwitch->MCLSet_Switch(&_A,&output);
  }
  

现在的问题是，它不能识别MySwitch->MCLSet_Switch(&_A,&output)函数，这意味着mclNET.dll还没有完全暴露在我的原生C++代码中。

我想知道这里出了什么问题？我怎么可能纠正它呢？如何在本机C++应用程序中调用.NET dll？非常感谢。