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How to execute a command and get the output of command within C++ using POSIX?
You can use the popen and pclose functions to pipe to and from processes. The popen() function opens a process by creating a pipe, forking, and invoking the shell. We can use a buffer to read the contents of stdout and keep appending it to a result string and return this string when the processes exit.
example
#include <iostream>
#include <stdexcept>
#include <stdio.h>
#include <string>
using namespace std;
string exec(string command) {
char buffer[128];
string result = "";
// Open pipe to file
FILE* pipe = popen(command.c_str(), "r");
if (!pipe) {
return "popen failed!";
}
// read till end of process:
while (!feof(pipe)) {
// use buffer to read and add to result
if (fgets(buffer, 128, pipe) != NULL)
result += buffer;
}
pclose(pipe);
return result;
}
int main() {
string ls = exec("ls");
cout << ls;
}Output
This will give the output −
a.out hello.cpp hello.py hello.o hydeout my_file.txt watch.py
Updated on: 12-Feb-2020
10K+ Views
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