How to use .Net assembly in VS 6 C++ Project ?

How to use .Net assembly in VS 6 C++ Project ?

• Wainz

  Thank you for your response , it helps alot. I can implement the the sample. But it does not work on my dll,

  My C# dll is for MSMQ operations .I can send messages to MSMQ in a C# application by using this dll(after modification that is explained in your link) and same function order. But it does not work with C++. In debug mode , Insatance can be created but while calling SendMSMQMsg function I get the following error

  Debug Error'

  Program:.. CDLL.exe

  Module :

  File :i386\chkesp.c

  Line:42

  The value of ESP was not properly saved across a function call. This is usually a result of calling a function declared with one calling converition with a function pointer declared with a differenr called convertion

  Stop:    Retry   Ignore

  And no message can be sent to MSMQ

  Threre is no error in release and no message can be sent to MSMQ. I hav not seen a sample dll  that contains class members as my dll. The only have functions. Can it cause it

   

   C++ and C# code segments can be seen below.

  ///////////////  C++   /////////////////

  #include "stdafx.h"

  #include <windows.h>

  #include <stdio.h>

   

  #pragma warning (disable: 4278)

   

  // To use managed-code servers like the C# server,

  // we have to import the common language runtime:

  #import "mscorlib.tlb" raw_interfaces_only

   

   

  #import "lib_msmq.tlb" no_namespace named_guids

  //#endif

  int main(int argc, char* argv[])

  {

              ILib_msmq *cpi = NULL;

              int retval = 1;

   

              // Initialize COM and create an instance of the InterfaceImplementation class:

              CoInitialize(NULL);

              HRESULT hr = CoCreateInstance(CLSID_Lib_msmq,

                          NULL, CLSCTX_INPROC_SERVER,

                          IID_ILib_msmq, reinterpret_cast<void**>(&cpi));

   

              if (FAILED(hr))

              {

                          printf("Couldn't create the instance!... 0x%x\n", hr);

              }

              else

              {

   

                                     printf("Calling function.\n");

                                     fflush(stdout);

                                     // The variable cpi now holds an interface pointer

                                     // to the managed interface.

                                     // If you are on an OS that uses ASCII characters at the

                                     // command prompt, notice that the ASCII characters are

                                     // automatically marshaled to Unicode for the C# code.

   

                                     int aa;

                                     cpi->SetQueue("1crd1");

                                     aa = cpi->SendMSMQMsg("dene","data");

                         

                                     printf("Returned from function.\n");

   

                          cpi->Release();

                          cpi = NULL;

              }

   

              // Be a good citizen and clean up COM:

              CoUninitialize();

              return retval;

  }

  /////////////// Some Code segment from  C# DLL   /////////////////

   

  using System;

  using System.Messaging;

  using System.Runtime.InteropServices;

   

  namespace libmsmq

  {

   

        [Guid("D6F88E95-8A27-4ae6-B6DE-0542A0FC7039")]

        public interface ILib_msmq

        {          

              void SetQueue(string pi_queueName);

              void SetMSMQMsg(string msg_label,string msg_body);

              int SendMSMQMsg(string msg_label, string msg_body);       

              void KillEmAll();

             

   

        }

   

        /// <summary>

        /// Summary description for Class1.

        /// </summary>

        [Guid("13FE32AD-4BF8-495f-AB4D-6C61BD463EA4")]

        public class Lib_msmq : ILib_msmq

        {

             

              private MessageQueue monitorQueue;

              private Message monitor_msg;

              private MessagePropertyFilter filtre;

                          ////////////////////

              public void SetQueue(string pi_queueName)

              {

                    monitor_msg= new Message();

                    monitorQueue = new MessageQueue( @".\PRIVATE$\"+ pi_queueName);             

                    filtre= new MessagePropertyFilter();                            

                    filtre.SetAll();

                    monitorQueue.MessageReadPropertyFilter=filtre;

              }

                          ///////////////////////////////////

               public int SendMSMQMsg(string msg_label, string msg_body)

              {

                    try

                    {                

                          monitor_msg.Body=msg_body;

                          monitor_msg.Label=msg_label;

                          SendMSMQMsg();

                          return MSMQ_SUCCESS;

                    }

                    catch(Exception e)

                    {

                          errorStr=e.Message;

                          return MSMQ_ERROR;

                    }

              }

  
  
  

• Alexei_shk

  See if reading this article solves your problem.
  
• How to use .Net assembly in VS 6 C++ Project ?