VC 实现共享内存

#ifndef _CSHAREMEMORY_H_#define _CSHAREMEMORY_H_/* *   CopyRight (C) by [e-mail]. All rights is reserved. *   Time:     2013.04.09 *   File:     CShareMemory.h *   Function: This file is written to finish the memory shared. *   Warning:  If you want to use this class, you must init one object then to call back InitMemory() */#include <windows.h>#include <stdio.h>#include <string>#include <iostream>using namespace std;#define  BUF_SIZE  1024class CShareMemory{public:LPVOID  m_lpMemory;// to receive the value that MapViewOfFile returnpublic:CShareMemory(LPCTSTR lpName);~CShareMemory();bool    InitMemory();LPVOID  ReadMemory();bool    ClearMemory();void    WriteMemory(LPVOID lpVoid);private:LPCTSTR m_lpName;  // name of mapping objectHANDLE  m_hMapFile;// handle to map objectprotected:};#endif  /*_CSHAREMEMORY_H_*/

#include "CShareMemory.h"#include <sstream>CShareMemory::CShareMemory(LPCTSTR lpName){if (NULL != lpName)m_lpName = lpName;elsem_lpName = NULL;m_lpMemory = new char[BUF_SIZE];m_hMapFile = NULL;}CShareMemory::~CShareMemory(){if (NULL != m_lpName)m_lpName = NULL;if (m_lpMemory != NULL) {UnmapViewOfFile(m_lpMemory);m_lpMemory = NULL;}if (m_hMapFile != NULL) {CloseHandle(m_hMapFile);m_hMapFile = NULL;}}bool CShareMemory::InitMemory(){if (m_lpName == NULL) {MessageBox(NULL, "m_lpName is NULL...", "Warning", 0);return false;}m_hMapFile = CreateFileMapping(INVALID_HANDLE_VALUE,    // use paging fileNULL,                    // default security PAGE_READWRITE,          // read/write access0,                       // max. object size BUF_SIZE+1,              // buffer size  m_lpName);               // name of mapping objectif (m_hMapFile == NULL) { printf("Could not create file mapping object (%d).\n", GetLastError());return false;}m_lpMemory = MapViewOfFile(m_hMapFile,   // handle to map objectFILE_MAP_ALL_ACCESS,                 // read/write permission0,                   0,                   BUF_SIZE);           if (m_lpMemory == NULL) { printf("Could not map view of file (%d).\n", GetLastError()); return false;}return true;}LPVOID CShareMemory::ReadMemory(){    return m_lpMemory;}bool CShareMemory::ClearMemory(){if (m_lpMemory != NULL)delete [] m_lpMemory;elsereturn false;return true;}void CShareMemory::WriteMemory(LPVOID lpVoid){if (NULL == lpVoid)m_lpMemory = NULL;elseCopyMemory((char *)m_lpMemory, (char *)lpVoid, strlen((char *)lpVoid));}DWORD WINAPI ThreadProc1(LPVOID lpVoid);DWORD WINAPI ThreadProc2(LPVOID lpVoid);int main(){HANDLE handle1 = CreateThread(NULL, 0, ThreadProc1, NULL, NULL, NULL);HANDLE handle2 = CreateThread(NULL, 0, ThreadProc2, NULL, NULL, NULL);CloseHandle(handle1);CloseHandle(handle2);getchar();return 0;}DWORD WINAPI ThreadProc1(LPVOID lpVoid){char buffer[128] = {0};CShareMemory *client = new CShareMemory("SHAREMEMORY");client->InitMemory();int count=0;while(1) {//if (client->ReadMemory() != NULL)//continue;stringstream str;count++;str<<count;strcpy(buffer,"thread1 write 我是写入的数据");strcat(buffer,str.str().c_str());client->WriteMemory((LPVOID)buffer);cout<<buffer<<endl;Sleep(1500);}delete client;return 0;}DWORD WINAPI ThreadProc2(LPVOID lpVoid){char buffer[128] = {0};CShareMemory *server = new CShareMemory("SHAREMEMORY");server->InitMemory();while(1) {strcpy(buffer, (char *)server->ReadMemory());if (NULL != buffer) {cout<<"thread2 read：读物 "<<buffer<<endl;}Sleep(1000);}delete server;return 0;}