windows 文件内存映射

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 == 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;

}