c++: subprocess output to stdin

If you happen to be on windows :

follow this : http://support.microsoft.com/kb/190351

It describes it better than I ever would. You can redirect everything, everywhere.

Using popen skips the file, and gets you command's output through an in-memory buffer.

#include <iomanip>
#include <iostream>
using namespace std;
const int MAX_BUFFER = 255;
int main() {
    string stdout;
    char buffer[MAX_BUFFER];
    FILE *stream = popen("command", "r");
    while ( fgets(buffer, MAX_BUFFER, stream) != NULL )
        stdout.append(buffer);
    pclose(stream);
    cout << endl << "output: " << endl << stdout << endl;
}