static int MapLogFile(void){    hFile = CreateFile(".\\db.bin",        GENERIC_READ | GENERIC_WRITE,        0,        NULL,        OPEN_ALWAYS,        FILE_ATTRIBUTE_NORMAL | FILE_FLAG_WRITE_THROUGH,        NULL);    if (INVALID_HANDLE_VALUE =http://www.mamicode.com/= hFile) {        goto err;    }    hMap = CreateFileMapping(hFile,        NULL,        PAGE_READWRITE,        0, MAP_LENGTH,        NULL);    if(0 == hMap) {        goto err_map;    }    MemAddrBegin = (unsigned char *)MapViewOfFile(hMap,        FILE_MAP_ALL_ACCESS,        0, 0,        0);    if(0 == MemAddrBegin) {        goto err_view;    }    return 0;err_view:    CloseHandle(hMap);err_map:    CloseHandle(hFile);err:    return -1;}static int UnMapLogFile(void){    UnmapViewOfFile(MemAddrBegin);    CloseHandle(hMap);    CloseHandle(hFile);    return 0;}