How to get specific data from output of the command run through c?

Question

system("netsh wlan show profile");

I executed this cmd using c program now, i want all profile names shown in the output and save it in variable(array). How to do that also please tell me in detailed because i don't have knowledge of c, i am trying to learning it.

system only runs a command and gives you its exit status. To get the actual output of the program read about the popen function (or _popen on Windows). — Some programmer dude
– Some programmer dude, Commented Aug 1, 2022 at 7:10

David Ranieri · Accepted Answer · 2022-08-01 07:34:18Z

5

Use popen:

#include <stdio.h>
#include <stdlib.h>

int main(void)
{
    const char *str = "netsh wlan show profile";
    FILE *cmd;

#ifdef _WIN32
    cmd = _popen(str, "r");
#elif __unix
    cmd = popen(str, "r");
#else
#   error "Unknown system"
#endif
    if (cmd == NULL)
    {
        perror("popen");
        exit(EXIT_FAILURE);
    }

    char result[1024];

    while (fgets(result, sizeof(result), cmd))
    {
        printf("output: %s", result);
    }
#ifdef _WIN32
    _pclose(cmd);
#elif __unix
    pclose(cmd);
#endif
    return 0;
}

edited Aug 1, 2022 at 7:34

answered Aug 1, 2022 at 7:10

David Ranieri

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8 Comments

Some programmer dude Over a year ago

Why do you declare the popen and pclose functions? Both they and the Windows _popen and _pclose are declared in the stdio.h header file. You should not declare them yourself.

David Ranieri Over a year ago

@Someprogrammerdude without a prototype gcc is warning: warning: implicit declaration of function ‘popen’ (at least on Linux)

Weather Vane Over a year ago

With MS VC it's _popen() and _pclose() because they are not Standard C functions.

Some programmer dude Over a year ago

You really get the warnings when building on Linux? That's very odd. The official POSIX documentation quite clearly states that it should be declared in <stdio.h>. And I can't replicate it on my own (on different systems).

Shawn Over a year ago

@DavidRanieri Yup, there's the issue. Use -std=gnu11 or #define the appropriate feature test macro before any includes.

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