Pipe problem

[sjeps]

Hi everyone.

I have an external lib that prints some lines with printf.

I'd like to redirect that lines and use them in another function i'm running..

I tried dup2 and pipes with no success..

My goal would be redirecting the stdout to something that could be read with a function like scanf() o read()

What should i do?

Thanks

[Albatross]

Sorry... why exactly are you trying to redirect stdout?

If you're absolutely sure you know what you're doing and you're sure that you have to redirect that stream, then:
http://www.cplusplus.com/reference/clibrary/cstdio/freopen/

-Albatross

[sjeps]

what i need to do is capture the output printed by printf from a function of an external lib..

i'll try your method

edit:

i don't need/want to use a file..

i need to read from the standard output of a function (that i could call as a new process or thread) in real time in another process/thread

[moorecm]

Try something like this:

// test.cpp
#include <iostream>
int main() {
    std::string s;
    while( cin >> s ) {
        std::cout << s << std::endl;
    }
    return 0;
}

The shell handles redirection and piping for you:

$ g++ test.cpp
$ ls | a.out

or

$ a.out < input.txt