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/* 
Module : MEMMAP.H 
Purpose: Interface for an MFC class to wrap memory mapped files 
Created: PJN / 30-07-1997 
 
 
Copyright (c) 1997 - 1998 by PJ Naughter.   
All rights reserved. 
 
*/ 
 
 
////////////////////////////////// Macros /////////////////////////// 
 
#ifndef __MEMMAP_H__ 
#define __MEMMAP_H__ 
 
 
 
 
/////////////////////////// Classes ///////////////////////////////// 
 
 
class CMemMapFile : public CObject 
{ 
public: 
//Constructors / Destructors 
  CMemMapFile(); 
  ~CMemMapFile(); 
 
 
//Methods 
  BOOL    MapFile(const CString& sFilename, BOOL bReadOnly = FALSE, DWORD dwShareMode = 0,  
                  BOOL bAppendNull = FALSE, BOOL bNamed = FALSE); 
  BOOL    MapMemory(const CString& sName, DWORD dwBytes, BOOL bReadOnly = FALSE); 
  BOOL	  MapExistingMemory(const CString& sName, DWORD dwBytes, BOOL bReadOnly = FALSE); 
  LPVOID  Open(DWORD dwTimeout = INFINITE); 
  BOOL	  Close(); 
  void    UnMap(); 
  BOOL    IsOpen() { return m_bOpen; }; 
  DWORD   GetLength() { return m_dwLength; }; 
  BOOL	  Flush(); 
  CString GetMappingName() const; 
 
 
//Diagnostics / Debug 
  #ifdef _DEBUG 
  virtual void AssertValid() const; 
  virtual void Dump(CDumpContext& dc) const; 
  #endif 
 
protected: 
  DECLARE_DYNAMIC(CMemMapFile) 
 
  BOOL MapHandle(HANDLE hHandle); 
  CString CreateMappingName(const CString& sName, BOOL bNamed); 
  CString CreateMutexName() const; 
 
  HANDLE  m_hFile; 
  HANDLE  m_hMapping; 
  BOOL    m_bReadOnly; 
  BOOL    m_bAppendNull; 
  LPVOID  m_lpData; 
  CString m_sMappingName; 
  BOOL    m_bOpen; 
  HANDLE  m_hMutex; 
  DWORD   m_dwLength; 
}; 
 
 
#endif //__MEMMAP_H__