新手求教 用vs2012编c++程序无法使用open函数

[张C__]

新手求教 用vs2012编c++程序时无法使用open函数打开，显示未定义该成员，需要使用什么头文件吗。

[逸萌]

贴出Code

[lm_whales]

//io.h #include<io.h>

[wxm870914]

#include "stdafx.h" #include <windows.h> #include <fcntl.h> #include <sys/stat.h> #include <io.h> void main() { char block[1024]; int in, out; int num_read; in = open("input_file", O_RDONLY); if (in == -1) { write(2, "An error has occurred opening the file:'input_file'\n", 52); exit (1); } out = open("output_file", O_WRONLY|O_CREAT, S_IREAD|S_IWRITE); if (out == -1) { write(2, "An error has occurred opening the file:'output_file'\n", 53); exit (1); } while ((num_read = read(in, block, sizeof(block))) > 0) write(out, block, num_read); } 编译不通过.