NetAPIDeallocator.hpp

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/******************************************************************************
** Copyright © 2002 by J.M.McGuiness, coder@hussar.me.uk
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License as published by the Free Software Foundation; either
** version 2.1 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
 
#include "../../../core/deleter.hpp"
 
#include <boost/noncopyable.hpp>
 
/////////////////////////////////////////////////////////////////////////////
 
namespace jmmcg { namespace NTUtils {
 
   const TCHAR netapi32_nt_lib_name[]=_T("netapi32.dll");
   const TCHAR NetApiBufferFree_name[]=_T("NetApiBufferFree");
   typedef NET_API_STATUS (NET_API_FUNCTION *pNetApiBufferFreeType)(IN LPVOID Buffer);
 
   template <class T>
   struct NetEnumDeallocator : std::unary_function<T, void> {
      typedef default_deleter<T> deleter_t;
 
      result_type __fastcall operator()(argument_type *t) const {
         if (t) {
            if (*t) {
               register DWORD ret=::WNetCloseEnum(*t);
               JMMCG_TRACE(_T("NetEnumDeallocator::~operator()(): Windows error code: ")<<win_exception::StrFromWinErr(ret!=NO_ERROR ? ::GetLastError() : 0));
            }
            deleter_t().operator()(t);
         }
      }
   };
 
   template <class T>
   class NetAPIDeallocator : public std::unary_function<T, void>,virtual private LoadLibraryWrapper, private boost::noncopyable {
   public:
      __stdcall NetAPIDeallocator()
      : LoadLibraryWrapper(netapi32_nt_lib_name),
         pNetApiBufferFree(reinterpret_cast<pNetApiBufferFreeType>(::GetProcAddress(Handle(),NetApiBufferFree_name))) {
         assert(pNetApiBufferFree);
      }
 
      result_type __stdcall operator()(argument_type *t) const {
         if (t) {
            register NET_API_STATUS ret=(*pNetApiBufferFree)(t);
            JMMCG_TRACE(_T("NetAPIDeallocator::~operator()(): Windows error code: ")<<win_exception::StrFromWinErr(ret!=NO_ERROR ? ::GetLastError() : 0));
         }
      }
 
   private:
      const pNetApiBufferFreeType pNetApiBufferFree;
   };
 
} }