c++ - how to read command output line by line in gcc in windows just as with the standard input? -

this tried:

#include <iostream> #include <string>  int main(int argc, char const *argv[]) {   using namespace std;   (string cin_line; getline(cin, cin_line);) {     cout << cin_line << endl;   }   file* pipe = popen("app.exe", "r");   (string result_line; getline(pipe, result_line);) {     cout << result_line << endl;   }   pclose(pipe);   return 0; } 

it doesn't compile, result is:
no matching function call 'getline(file*&, std::__cxx11::string&)'

second example i've found here: https://stackoverflow.com/a/10702464/393087 seems mingw doesn't have pstream included: fatal error: pstream.h: no such file or directory - edit: ok know, missed not gcc library, named separate download: http://pstreams.sourceforge.net/

i know how using buffer , whole output on single line (like here: https://stackoverflow.com/a/478960/393087 ) explode line \n , array, point here must provide output input comes in.

also tried example here: https://stackoverflow.com/a/313382/393087 - i've added main function that:

#include <cstdio> #include <iostream> #include <string>  int main(int argc, char const *argv[]) {   using namespace std;   file * fp ;    if((fp= popen("/bin/df","r")) == null) {       // error processing , exit   }   ifstream ins(fileno(fp)); // ifstream ctor using file descriptor    string s;   while (! ins.eof()){       getline(ins,s);       //   }     return 0; } 

this doesn't compile:
error: variable 'std::ifstream ins' has initializer incomplete type ifstream ins(fileno(fp)); // ifstream ctor using file descriptor

you can't this:

file* pipe = popen("app.exe", "r"); (string result_line; getline(pipe, result_line);) {     cout << result_line << endl; } pclose(pipe); 

you need this:

#include <boost/noncopyable.hpp> #include <boost/iostreams/stream.hpp> #include <boost/iostreams/device/file_descriptor.hpp>  file* pipe = popen("app.exe", "r");  boost::iostreams::file_descriptor_source   source(fileno(pipe), boost::iostreams::never_close_handle);  boost::iostreams::stream<boost::iostreams::file_descriptor_source>  stream(source, 0x1000, 0x1000);   string result_line;  while (getline(stream, result_line)) {      cout << result_line << endl; } 

:)