在做项目时遇到需要用到多个进程对共享内存读写，考虑到数据冲突问题，特加上互斥作为访问约束条件，具体代码如下：

HANDLE CreateOpenFileMapping(LPCTSTR lpShareMemName) { //打开共享的文件对象。 HANDLE hMapFile = OpenFileMapping(FILE_MAP_ALL_ACCESS, FALSE,lpShareMemName); if (hMapFile) {} else { //创建共享文件。 hMapFile = CreateFileMapping(INVALID_HANDLE_VALUE,NULL, PAGE_READWRITE,0,BUF_SIZE,lpShareMemName); } return hMapFile; }//向共享内存写入数据 / ///函数主要对共享内存读写 ///hMapFile :共享内训映射句柄 ///bInOutData:写入或者读取数据 ///lpMutexName:互斥量名字 ///bRW :读写标志 0 read ; 1 write ///返回值 ture成功 ; false 失败 / BOOL OperateData(HANDLE hMapFile,BYTE *bInOutData,LPCTSTR lpMutexName,bool bRW) { BOOL bSuc = FALSE; BYTE *pBuf = (BYTE *)MapViewOfFile( hMapFile,// 共享内存的句柄 FILE_MAP_ALL_ACCESS, // 可读写许可 0, 0, BUF_SIZE ); if (pBuf) { //加把锁在这地方 HANDLE hMutex = CreateMutex(NULL,FALSE,lpMutexName); if (hMutex && WaitForSingleObject(hMutex, 30*1000) == WAIT_OBJECT_0) { if (bRW) { memset(pBuf,0,BUF_SIZE); memcpy(pBuf,bInOutData,BUF_SIZE - 1); } else { memcpy(bInOutData,pBuf,BUF_SIZE - 1); } ReleaseMutex(hMutex); CloseHandle(hMutex); UnmapViewOfFile(pBuf); hMutex = NULL; pBuf = NULL; bSuc = TRUE; } } return bSuc; }//读取共享内存数据 BOOL ReadFromMen(HANDLE hMapFile,BYTE *bOutData,LPCTSTR lpMutexName) { BOOL bSuc = FALSE; BYTE *pBuf = (BYTE *)MapViewOfFile( hMapFile,// 共享内存的句柄 FILE_MAP_ALL_ACCESS, // 可读写许可 0, 0, BUF_SIZE ); if (pBuf) { //加把锁在这地方 HANDLE hMutex = CreateMutex(NULL,FALSE,lpMutexName); if (hMutex && WaitForSingleObject(hMutex, 30*1000) == WAIT_OBJECT_0) {ReleaseMutex(hMutex); CloseHandle(hMutex); UnmapViewOfFile(pBuf); hMutex = NULL; pBuf = NULL; bSuc = TRUE; } } return bSuc; }wchar_t *MultToWide(LPSTR pChar) { wchar_t* pWCHAR=NULL; //计算pChar所指向的多字节字符串相当于多少个宽字节 DWORD num=MultiByteToWideChar(CP_ACP,0,pChar,-1,NULL,0); pWCHAR=(wchar_t*)malloc(num*sizeof(wchar_t)); if (pWCHAR==NULL) { free(pWCHAR); }memset(pWCHAR,0,num*sizeof(wchar_t)); //多字节转换为宽字节 MultiByteToWideChar(CP_ACP,0,pChar,-1,pWCHAR,num); return pWCHAR; }char *WideToMult(LPWSTR pWCHAR) { //计算需要多少个字节才能表示对应的多字节字符串 DWORD num=WideCharToMultiByte(CP_ACP,0,pWCHAR,-1,NULL,0,NULL,0); //开辟空间 char *pChar=NULL; pChar=(char*)malloc(num*sizeof(char)); if (pChar) { memset(pChar,0,num*sizeof(char)); //将宽字节字符串转换为多字节字符串 WideCharToMultiByte(CP_ACP,0,pWCHAR,-1,pChar,num,NULL,0); } return pChar; } int _tmain() { 创建共享文件句柄 //HANDLE hMapFile = CreateFileMapping( // INVALID_HANDLE_VALUE,// 物理文件句柄 // NULL,// 默认安全级别 // PAGE_READWRITE,// 可读可写 // 0,// 高位文件大小 // BUF_SIZE,// 地位文件大小 // szName// 共享内存名称 // ); //char *pBuf = (char *)MapViewOfFile( // hMapFile,// 共享内存的句柄 // FILE_MAP_ALL_ACCESS, // 可读写许可 // 0, // 0, // BUF_SIZE // ); //while(1) //{ // cout << "input..." << endl; // char szInfo[BUF_SIZE] = {0}; // gets(szInfo); // 其实gets并不安全 // strncpy(pBuf, szInfo, BUF_SIZE - 1); // pBuf[BUF_SIZE - 1] = '\0'; //}//UnmapViewOfFile(pBuf); //CloseHandle(hMapFile); //写入 HANDLE hMapFile = CreateOpenFileMapping(_T("NameOfMappingObject")); for (int i=0; i<1000000; i++) { CString strInput = _T(""); strInput.Format(_T("%d%d%d%d%d%d; "),i,i,i,i,i,i); char *bInOutData = https://www.it610.com/article/WideToMult(strInput.GetBuffer(NULL)); BOOL Suc = OperateData(hMapFile,(BYTE*)bInOutData,_T("NameOfMappingObjectMutex"),1); cout<0; i++) //{ // HANDLE hMapFile1 = CreateOpenFileMapping(_T("NameOfMappingObject")); // BYTE bOutData[1024]; // BOOLSuc = OperateData(hMapFile1,(BYTE*)bOutData,_T("NameOfMappingObjectMutex"),0); // char *P = (char*)bOutData; // cout<【共享内存互斥访问|共享内存加锁互斥访问】