c# - 从 native C++ 调用 .NET dll

Question

我在使用 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方 dll。基本上我想在我的纯 native 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，它使 mclNET.dll 中的方法可见。这是我所做的:

• 在MCLWrapper.dll中，我添加了mclNET.dll作为引用，然后定义接口(interface)来制作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")]

• 然后在我构建这个Wrapper.dll 之后，我使用regasm 命令注册它，生成一个.tlb 文件

• 然后在我的 native C++ 应用程序中，我导入了 tlb 文件，并尝试使用引用 NET.dll 的 Wrapper.dll。这是 native C++ 应用程序中的一些代码:

  #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，它不识别MySwitch->MCLSet_Switch(&_A,&output)函数，也就是说，mclNET.dll没有完全暴露给我原生 C++ 代码。

我想知道这里有什么问题？我怎样才能纠正它？如何在我的 native C++ 应用程序中调用 .NET dll？非常感谢。

Answer 1

#import <mscorlib.tlb> raw_interfaces_only
#import C:/MyPath/MCLWrapper.tlb" no_namespace named_guids

尝试上面提到的导入语句 - 对我和从您的 native C++ 调用您的 .net 代码而不使用任何 namespace 。