trying to pipe in both direction

[thedeveloperinlondon]

using the following program i am trying to feed a certain external process with its input and take its output and store the whole output onto a variable. i am from a perl background, usually in perl we can use |s easily with filehandles. can anyone point out what i did wrong below?


// script to test piping IOs
#include <fstream>

using std::cout;
using std::cin;
using std::ios;
using std::fstream;

int main() {
char buffer[256];
fstream PipeProcess(&quot;| /script_that_takes_input_then_gives_output |&quot;, ios::in | ios:ut);

if (!PipeProcess) {
cerr << &quot;file could not be opened.&quot; << endl;
exit(1);
}

cout << &quot;my input to this script&quot;;

// read the output from the script
while (!PipeProcess.eof())
{
PipeProcess.getline(buffer,256);
cin << buffer;
}
return 0;
}
~
~

 

[jstreich]

Pipe always only works in one direction.... Sounds like your trying to take your input feed it to another program and read it back... What you'll want to do is:

system("/*aplication*/ > temp.txt");
fstream fin;
fin.open("temp.txt");
//do stuff
fin.close();
sytem(rm temp.txt");

 

[danielhozac]

You could use a FIFO to read the data back, this is some psuedo code:
[tt]mkfifo(&quot;fifo&quot;
program = popen(&quot;command > fifo&quot;, &quot;w&quot;
output = open(&quot;fifo&quot;, &quot;r&quot;
write(program, &quot;things&quot;
read(output, buffer);
pclose(program);
close(output);[/tt] //Daniel

 

[sfi]

Have you tried tee?