如何将输出重定向到屏幕后freopen函数（QUOT; out.txt＆QUOT;，＆QUOT; A＆QUOT ;,标准输出） [英] How to redirect the output back to the screen after freopen("out.txt", "a", stdout)

问题描述

#include <stdio.h>

int main() {
    printf("This goes to screen\n");
    freopen("out.txt", "a", stdout);
    printf("This goes to out.txt");
    freopen("/dev/stdout", "a", stdout);
    printf("This should go to screen too, but doesn't\n");

    return 0;
}

我打电话freopen函数重定向的标准输出的到out.txt然后我打印的文件的东西，现在我想将其重定向到屏幕，但则freopen（的/ dev /标准输出，一，标准输出）; 的不起作用。有没有办法做到这一点使用ANSI C或POSIX系统调用？

I call freopen to redirect the stdout to out.txt then I print something on the file, now I want to redirect it back to the screen, but freopen("/dev/stdout", "a", stdout); doesn't work. Is there any way to do that using ANSI C or POSIX system calls?

推荐答案

我不能想办法在跨平台的方式做到这一点，但在GNU / Linux系统（也许其他POSIX兼容的人，太），你可以则freopen（为/ dev / tty的，一，标准输出）。难道这是你想干什么？

I can't think of a way to do this in a cross-platform manner, but on GNU/Linux systems (and maybe other POSIX-compliant ones, too) you can freopen ("/dev/tty", "a", stdout). Is this what you were trying to do?

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