共享内存封装类
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// SFMMem.cpp: implementation of the CSFMServer class.
//------------------------------------------------------
#include "stdafx.h"
#include "SFMMem.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
// Construction/Destruction
CSFMServer::CSFMServer()
{
_Init();
//
Create(DEFAULT_FILENAME, DEFAULT_MAPNAME, DEFAULT_MAPSIZE);
}
CSFMServer::~CSFMServer()
{
_Destory();
}
CSFMServer::CSFMServer(char *szFileName, char *szMapName, DWORD dwSize)
{
_Init();
//
Create(szFileName, szMapName, dwSize);
}
void CSFMServer::_Init()
{
m_hFile = NULL;
m_hFileMap = NULL;
m_lpFileMapBuffer = NULL;
m_pFileName = NULL;
m_pMapName = NULL;
m_dwSize = 0;
m_iCreateFlag = 0;
}
void CSFMServer::_Destory()
{
if (m_lpFileMapBuffer)
{
UnmapViewOfFile(m_lpFileMapBuffer);
m_lpFileMapBuffer = NULL;
}
if (m_hFileMap)
{
CloseHandle(m_hFileMap);
m_hFileMap = NULL;
}
if (m_hFile && m_hFile != INVALID_HANDLE_VALUE)
{
CloseHandle(m_hFile);
m_hFile = NULL;
}
if (m_pFileName)
{
free(m_pFileName);
m_pFileName = NULL;
}
if (m_pMapName)
{
free(m_pMapName);
m_pMapName = NULL;
}
_Init();
}
void CSFMServer::Create(char *szFileName, char *szMapName, DWORD dwSize)
{
if (m_iCreateFlag)
_Destory();
if (szFileName)
m_pFileName = _strdup(szFileName);
//else m_pFileName = NULL;
if (szMapName)
m_pMapName = _strdup(szMapName);
else m_pMapName = _strdup(DEFAULT_MAPNAME);
if (dwSize > 0)
m_dwSize = dwSize;
else m_dwSize = DEFAULT_MAPSIZE;
if (m_pFileName)
{
// file
m_hFile = CreateFile(
m_pFileName,
GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_READ|FILE_SHARE_WRITE,
NULL,
OPEN_ALWAYS,//OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL
);
}
else
{
// system
m_hFile = (HANDLE)0xFFFFFFFF;
}
if (m_hFile)
{
m_hFileMap = CreateFileMapping(
m_hFile,
NULL,
PAGE_READWRITE,
0,
m_dwSize,
m_pMapName
);
//使只有一个CSFMServer对象能操作内存对象
//if (m_hFileMap != NULL && ERROR_ALREADY_EXISTS == GetLastError())
//{
// CloseHandle(m_hFileMap);
// m_hFileMap = NULL;
//}
}
if (m_hFileMap)
{
m_lpFileMapBuffer = MapViewOfFile(
m_hFileMap,
FILE_MAP_ALL_ACCESS,//FILE_MAP_WRITE|FILE_MAP_READ,
0,
0,
m_dwSize
);
}
m_iCreateFlag = 1;
}
LPVOID CSFMServer::GetBuffer()
{
return (m_lpFileMapBuffer)?(m_lpFileMapBuffer):(NULL);
}
DWORD CSFMServer::GetSize()
{
return m_dwSize;
}
// Construction/Destruction
CSFMClient::CSFMClient()
{
_Init();
//
Open(FILE_MAP_READ, DEFAULT_MAPNAME);
}
CSFMClient::~CSFMClient()
{
_Destory();
}
CSFMClient::CSFMClient(DWORD dwAccess, char *szMapName)
{
_Init();
//
Open(dwAccess, szMapName);
}
void CSFMClient::Open(DWORD dwAccess, char *szMapName)
{
if (m_iOpenFlag)
_Destory();
if (szMapName)
m_pMapName = _strdup(szMapName);
else m_pMapName = _strdup(DEFAULT_MAPNAME);
m_hFileMap = OpenFileMapping(
dwAccess,
TRUE,
m_pMapName
);
if (m_hFileMap)
{
m_lpFileMapBuffer = MapViewOfFile(
m_hFileMap,
dwAccess,
0,
0,
0
);
}
m_iOpenFlag = 1;
}
void CSFMClient::_Init()
{
m_hFileMap = NULL;
m_lpFileMapBuffer = NULL;
m_pMapName = NULL;
m_iOpenFlag = 0;
}
void CSFMClient::_Destory()
{
if (m_lpFileMapBuffer)
{
UnmapViewOfFile(m_lpFileMapBuffer);
m_lpFileMapBuffer = NULL;
}
if (m_hFileMap)
{
CloseHandle(m_hFileMap);
m_hFileMap = NULL;
}
if (m_pMapName)
{
free(m_pMapName);
m_pMapName = NULL;
}
_Init();
}
LPVOID CSFMClient::GetBuffer()
{
return (m_lpFileMapBuffer)?(m_lpFileMapBuffer):(NULL);
}
DWORD CSFMClient::GetSize()
{
// unnable use
return 0;
}
测试环境：Win2K+VC6+普通应用程序
未对服务程序/ISAPI等其他应用进行测试，应该也是可以的
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