freopen stdout and console

Question

Given the following function:

freopen(\"file.txt\",\"w\",stdout);

Redirects stdout into a file, how do I make it so stdout redirects back i

Answer 1

You should be able to use _dup to do this

Something like this should work (or you may prefer the example listed in the _dup documentation):

#include 
#include 

...
{
    int stdout_dupfd;
    FILE *temp_out;

    /* duplicate stdout */
    stdout_dupfd = _dup(1);

    temp_out = fopen("file.txt", "w");

    /* replace stdout with our output fd */
    _dup2(_fileno(temp_out), 1);
    /* output something... */
    printf("Woot!\n");
    /* flush output so it goes to our file */
    fflush(stdout);
    fclose(temp_out);
    /* Now restore stdout */
    _dup2(stdout_dupfd, 1);
    _close(stdout_dupfd);
}