Call an c# dll in c++

• • Reply

  15 years ago

  by bigisoft

  stefan biegler

  , Austria

  Joined 15 years ago
  Hi guys,
  
  I tried several times to create a c# dll and call it in c++, but it never works and i don't know why.
  Here is my code:
  
  This is the code from the c# dll :
  
  using System;
  using System.Runtime.InteropServices;
  using System.Windows.Forms;
  
  namespace MyInterop
  {
     [Guid("03AD5D2D-2AFD-439f-8713-A4EC0705B4D9")]
     interface IMyDotNetInterface
     {
         void ShowCOMDialog();
     }
     
     [ClassInterface(ClassInterfaceType.None)]
     [Guid("0490E147-F2D2-4909-A4B8-3533D2F264D0")]
     class MyDotNetClass : IMyDotNetInterface
     {
         // Need a public default constructor for COM Interop.
         public MyDotNetClass()
         {}
         public void ShowCOMDialog()
         {
             System.Windows.Forms.MessageBox.Show(“I am a" +
                   "  Managed DotNET C# COM Object Dialog”);
         }
     }
  }
  
  After that I create a strong name key pair
  sn -k TestKeyPair.snk
  
  and write it  in the AssemblyInfo.cs like this:
  [assembly: AssemblyKeyFile("TestKeyPair.snk")]
  
  THen i add it to the Gac:
  gacutil /i MyInterop.dll
  
  At last I Register my assembly for COM
  REGASM MyInterop.dll /tlb:com.MyInterop.tlb
  
  Now the c++ Code:
  
  #import “<Full Path>\com.MyInterop.tlb" named_guids raw_interfaces_only
  CoInitialize(NULL);   //Initialize all COM Components
     
  // <namespace>::<InterfaceName>
  MyInterop::IMyDotNetInterfacePtr pDotNetCOMPtr;
  
  // CreateInstance parameters
  // e.g. CreateInstance (<namespace::CLSID_<ClassName>
  HRESULT hRes =
   pDotNetCOMPtr.CreateInstance(MyInterop::CLSID_MyDotNetClass);
  if (hRes == S_OK)
  {
     BSTR str;
     pDotNetCOMPtr->ShowCOMDialog ();
     //call .NET COM exported function ShowDialog ()
  }
  
  CoUninitialize ();   //DeInitialize all COM Components
  
  I can load the tlb into the c++ Project, but my compiler says that  
  
  MyInterop::IMyDotNetInterfacePtr pDotNetCOMPtr;
  
  is not a Member of MyInterop and he dowsn't know any Methods of this class.
  PLeases help me or give me an example how to call an c# dll in a c++ project.
  
  
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