Win32 Security in Managed C++

Listing 4 Extracts from SID.h & SID.cpp

namespace SynSoft
{
  namespace Security
  {
// SID.h

    public __gc class SID
      : public IDisposable
    {
    public:
      SID(void *psid);
      ~SID();

    // IDisposable
    public:
      void  Close();
      void  Dispose();

    // Properties
    public:
      // Returns a string representation of the SID
      String *ToString();

      // The type of the SID
      __property SidType get_Type();
      // The name of the user associated with the SID
      __property String *get_UserName();
      // The name of the domain associated with the SID
      __property String *get_DomainName();

    // Members
    private:
      void    *m_psid;
      SidType m_type;
      String  *m_userName;
      String  *m_domainName;
      String  *m_stringForm;
    };

// SID.cpp

    SID::SID(void *psid)
      : m_psid(Sec_SidDup(psid))
      , m_type(SidType::Unknown)
      , m_userName(0)
      , m_domainName(0)
      , m_stringForm(0)
    {
      // Now we get the user and domain names

      if(0 == psid)
      {
        throw new SecurityException(E_INVALIDARG, "NULL SID");
      }
      else if(!::IsValidSid(psid))
      {
        throw new SecurityException(::GetLastError(), "Invalid SID");
      }
      else
      {
          . . . 
      }
    }

    SID::~SID()
    {
      if(0 != m_psid)
      {
        Sec_Free(m_psid);
      }
    }

    void SID::Close()
    {
      if(0 != m_psid)
      {
        Sec_Free(m_psid);
        m_psid = 0;
      }
    }

    void SID::Dispose()
    {
      Close();
    }

    . . .
  }
}