windows 共享内存

----------------------------------------父例程：创建内存块----------------------------------------------

ShareMemory.h

#pragma once#include <Windows.h>#include <tchar.h>const DWORD ERROR_NOT_CREATE = 0x66001;class CShareMemory{public:CShareMemory(void);virtual ~CShareMemory(void);DWORD Create(const TCHAR *pName, DWORD dwMaximumSizeLow,   DWORD dwMaximumSizeHigh = 0,  DWORD flProtect = PAGE_READWRITE,  LPSECURITY_ATTRIBUTES lpAttributes = NULL);DWORD Write(byte *pbData, DWORD dwLength, DWORD dwOffsetLow = 0, DWORD dwOffsetHigh = 0);DWORD Read(byte *pbBuf, DWORD dwLength,    DWORD dwOffsetLow = 0,    DWORD dwFileOffsetHigh = 0);void  Close(void);DWORD SetAccess(DWORD dwDesiredAccess = FILE_MAP_ALL_ACCESS);private:TCHAR *m_pName;HANDLE m_hShareMemory, m_hAccessMutex;BOOL m_bCreate;byte *m_pView;};<strong></strong>

ShareMemory.cpp

#include "ShareMemory.h"CShareMemory::CShareMemory(void): m_pName(NULL), m_pView(NULL), m_hShareMemory(NULL), m_hAccessMutex(NULL),   m_bCreate(FALSE){m_pView = new byte;}CShareMemory::~CShareMemory(void){Close();}DWORD CShareMemory::Create(const TCHAR *pName, DWORD dwMaximumSizeLow,    DWORD dwMaximumSizeHigh, DWORD flProtect,    LPSECURITY_ATTRIBUTES lpAttributes){if (pName == NULL){return ERROR_INVALID_PARAMETER;}m_pName = new TCHAR[_tcslen(pName)+1];_tcscpy(m_pName, pName);m_pName[_tcslen(pName)] = TEXT('\0');m_hShareMemory = CreateFileMapping(INVALID_HANDLE_VALUE,    lpAttributes,    flProtect,    dwMaximumSizeHigh,    dwMaximumSizeLow,    m_pName);if (m_hShareMemory == NULL){return GetLastError();}TCHAR *pMtx = new TCHAR[_tcslen(pName)+4];_tcscpy(pMtx, m_pName);pMtx[_tcslen(m_pName)] = TEXT('\0');_tcscat(pMtx, TEXT("Mtx"));pMtx[_tcslen(pName)+3] = TEXT('\0');m_hAccessMutex = CreateMutex(lpAttributes, FALSE, pMtx);if (m_hAccessMutex == NULL){return GetLastError();}m_pView = (byte*)MapViewOfFile(m_hShareMemory,        FILE_MAP_ALL_ACCESS,    0,    0,    0);if (m_pView == NULL){return GetLastError();}memset(m_pView, '\0', dwMaximumSizeLow);m_bCreate = TRUE;return 0;}DWORD CShareMemory::Write(byte *pbData, DWORD dwLength,   DWORD dwOffsetLow,  DWORD dwOffsetHigh){DWORD dwErr(0);dwErr = WaitForSingleObject(m_hAccessMutex, INFINITE);if (dwErr != 0){return dwErr;}memcpy(m_pView+dwOffsetLow, pbData, dwLength);ReleaseMutex(m_hAccessMutex);return 0;}DWORD CShareMemory::Read(byte *pbBuf, DWORD dwLength,  DWORD dwOffsetLow, DWORD dwFileOffsetHigh){DWORD dwErr(0);dwErr = WaitForSingleObject(m_hAccessMutex, INFINITE);if (dwErr != 0){return dwErr;}memcpy(pbBuf, m_pView+dwOffsetLow, dwLength);ReleaseMutex(m_hAccessMutex);return 0;}void CShareMemory::Close(void){if (m_bCreate){delete [] m_pName;UnmapViewOfFile(m_pView);//delete m_pView;CloseHandle(m_hShareMemory);CloseHandle(m_hAccessMutex);m_bCreate = FALSE;}}DWORD CShareMemory::SetAccess(DWORD dwDesiredAccess){if (!m_bCreate){return ERROR_NOT_CREATE;}DWORD dwErr(0);dwErr = WaitForSingleObject(m_hAccessMutex, INFINITE);if (dwErr != 0){return dwErr;}UnmapViewOfFile(m_pView);m_pView = (byte*)MapViewOfFile(m_hShareMemory,      FILE_MAP_ALL_ACCESS,    0,    0,    0);ReleaseMutex(m_hAccessMutex);if (m_pView == NULL){return GetLastError();}return 0;}

main.cpp

#include "ShareMemory.h"#include <iostream>using namespace std;void _tmain(){cout<<"-----windows 共享内存父例程------------"<<endl<<endl;DWORD dwErr;CShareMemory sm;dwErr = sm.Create(TEXT("TESTSM"), 512);char *pIn = new char[256];char *pOut = new char[256];cin>>pIn;dwErr = sm.Write((byte*)pIn, strlen(pIn));dwErr = sm.Read((byte*)pOut, 100);//char *p;// = (char*)pOut;cout<<(char*)pOut<<endl;cin>>pIn;delete [] pIn;delete [] pOut;}

----------------------------------------子例程：分享父例程创建的内存块----------------------------------------------

// shareMemery_test.cpp : Defines the entry point for the console application.//#include "stdafx.h"#include <iostream>#include <Windows.h>using namespace std;int _tmain(int argc, _TCHAR* argv[]){cout<<"------windows 共享内存子例程--------------------"<<endl<<endl;HANDLE handle=::OpenFileMapping(FILE_MAP_ALL_ACCESS,FALSE,_T("TESTSM"));char* szShareMem = new char[256];szShareMem   =   (char*)::MapViewOfFile(handle,FILE_MAP_ALL_ACCESS,0,0,0); cout<<szShareMem<<endl<<endl;UnmapViewOfFile(szShareMem);delete [] szShareMem;CloseHandle(handle);system("pause");return 0;}

效果如下：