Which type in C# is equivalent to C++ HResult?

Which type in C# is equivalent to C++ HResult?

• Anand77

  I do not have .NET api, because i do not have right to download it, because it is too expensive for me to register.

  
  

• Tryin2Bgood

  actually you should use an Int.
  

• victu

  The hresult type is a signed 32 bit integer.
  

• RAED KASSAWAT

  Tnx everyone, i now have pretty big and clear picture what i must do.

  I will change all my methods to HRESULT type, which will be as this:

  using System;
  using System.Collections.Generic;
  using System.Text;
  namespace OPCServer
  {
  class HRESULT
  {
  public static readonly int S_OK = 0;
  public static readonly int S_FALSE = 1;
  public static readonly int E_NOTIMPL = 2;
  public static readonly int E_INVALIDARG = 3;
  public static readonly int E_FAIL = 4;
  }
  }

  This will represent return values of all my methods, which need HRESULT.

  
  

• Steven Twitchell - MSFT

  If by "but also, from OPC site, i downloaded OPC Core Components with dll files, which contain needed interfaces", you mean you downloaded the "OPC .Net API", then you should not use the IDL files as a reference - they are for the unmanaged (that is, not .net) interfaces.

  The .Net API should have completely different documentation (hopefully), and will not use any non-.net types like HRESULT (so you won't have to try converting types)

  
  

• arse

  Hi,

  System.IntPtr

  cheers

  
  
  

• akin_l

  Wrong example from me, sorry.

  My problem, in total, is how to implement OPC interfaces in C#. Yes, i have IDL files, but also, from OPC site, i downloaded OPC Core Components with dll files, which contain needed interfaces. Also, when i use some of dlls in project I can make this:

  using System;
  using System.Collections.Generic;
  using System.Text;
  using OpcRcw.Comn;
  using System.Runtime;

  namespace OPCServer
  {
  class OPCCommon : IOPCCommon
  {
  #region IOPCCommon Members

  public void GetErrorString(int dwError, out string ppString)
  {
  throw new Exception("The method or operation is not implemented.");
  }

  public void GetLocaleID(out int pdwLcid)
  {
  throw new Exception("The method or operation is not implemented.");
  }

  public void QueryAvailableLocaleIDs(out int pdwCount, out IntPtr pdwLcid)
  {
  throw new Exception("The method or operation is not implemented.");
  }

  public void SetClientName(string szName)
  {
  throw new Exception("The method or operation is not implemented.");
  }

  public void SetLocaleID(int dwLcid)
  {
  throw new Exception("The method or operation is not implemented.");
  }

  #endregion
  }
  }
  

  (This is just one of interfaces IOPCCommon)

  But, by IDL files, this interface looks like this:

  interface IOPCCommon : IUnknown
  {

  HRESULT SetLocaleID (
  [in] LCID dwLcid
  );

  HRESULT GetLocaleID (
  [out] LCID *pdwLcid
  );

  HRESULT QueryAvailableLocaleIDs (
  [out] DWORD *pdwCount,
  [out, size_is(,*pdwCount)] LCID **pdwLcid
  );

  HRESULT GetErrorString(
  [in] HRESULT dwError,
  [out, string] LPWSTR *ppString
  );

  HRESULT SetClientName (
  [in, string] LPCWSTR szName
  );

  }

  How i can use HRESULT in C#, if that is possible Or, if I can not do that, how i must implement this OPC Common interface, so it can provide necessary functionality for OPC Clients

  This is my question, in general.

  
  

• pappascd

  So, you wanna write a DLL that the OPC exe file will then consume and it requires you to export some functions (like the GetErrorString()).

  If this assumption is correct, this is not possible using C# since it can only output assemblies (managed DLLs), which your OPC exe will not be able to consume. In order to solve your problem, you will have to use C++ and compile a native DLL.

  If my assumption is wrong, could you please explain it more detailed

  
  
• Which type in C# is equivalent to C++ HResult?