[Boost-users] __stdcall with boost::function

From: Olenhouse, Jason (jason.olenhouse_at_[hidden])
Date: 2005-03-10 12:16:38

I'm trying to pass a member function pointer around to the Windows Service Control Manager through
Windpws API functions, but I think I'm having troubles with the __stdcall convention.  

I'm using MSVC 7.1.3088.  For brevity I've left out information, but I think this is enough to go on:

__ExampleClass.h__
class ExampleClass
{
protected:
  void Setup( void );
  void __stdcall ServiceMain( DWORD dwArgc, LPSTR *lpszArgv );
  LPSERVICE_MAIN_FUNCTION m_fServiceMain;
};

__ExampleClass.cpp__
void ExampleClass::Setup( void )
{
  boost::function<void ( DWORD, LPSTR * )> f2 = boost::bind( boost::mem_fn( &ExampleClass::ServiceMain
), this, _1, _2 );
  m_fServiceMain = f2.target<void ( DWORD, LPSTR * )>( );
  SERVICE_TABLE_ENTRY dispatchTable[ ] =
  {
    { const_cast<char *>( g_sAPP_NAME.c_str( ) ), m_fServiceMain },
    { 0, 0 }
  };

  StartServiceCtrlDispatcher( dispatchTable );
}

void __stdcall ExampleClass::ServiceMain( DWORD dwArgc, LPSTR *lpszArgv )
{
}

The error I receive concerns the line
    m_fServiceMain = f2.target<void ( DWORD, LPSTR * )>( );

error C2440: '=' : cannot convert from 'void (__cdecl *)(DWORD,LPSTR * )' to
'LPSERVICE_MAIN_FUNCTIONA'
        This conversion requires a reinterpret_cast, a C-style cast or function-style cast

LPSERVICE_MAIN_FUNCTIONA is defined in "winsvc.h" and is:
  typedef VOID (WINAPI *LPSERVICE_MAIN_FUNCTIONA)(
      DWORD   dwNumServicesArgs,
      LPSTR   *lpServiceArgVectors
      );

Any help or insight would be much appreciated.

-Jason