QProcess output example

main.cpp

#include <QCoreApplication>
#include <QtCore/QtCore>
#include "monitor.h"

int main(int argc, char *argv[])
{
  QCoreApplication a(argc, argv);

  QProcess p;
  p.start("/bin/ls");
  qDebug() << "Let's Go";
  Monitor m;

  QObject::connect(&p, SIGNAL(finished(int,QProcess::ExitStatus)), &m, SLOT(finished(int,QProcess::ExitStatus)));
  QObject::connect(&p, SIGNAL(readyReadStandardOutput()), &m, SLOT(readyReadStandardOutput()));
  QObject::connect(&p, SIGNAL(started()), &m, SLOT(started()));

  return a.exec();
}

monitor.cpp

#include "monitor.h"
#include <QtCore/QtCore>
#include <QProcess>

Monitor::Monitor(QObject *parent) :
    QObject(parent)
{
}

void Monitor::error(QProcess::ProcessError error)
{
  qDebug() << "Error: " << error;
}

void 	Monitor::finished(int exitCode, QProcess::ExitStatus exitStatus)
{
  qDebug() << "Finished: " << exitCode;
  qApp->exit();
}

void 	Monitor::readyReadStandardError()
{
  qDebug() << "ReadyError";
}

void 	Monitor::readyReadStandardOutput()
{
  qDebug() << "readyOut";
  QProcess *p = (QProcess *)sender();
  QByteArray buf = p->readAllStandardOutput();

  qDebug() << buf;
}

void 	Monitor::started()
{
  qDebug() << "Proc Started";
}

monitor.h

    #ifndef MONITOR_H
#define MONITOR_H

#include <QObject>
#include <QtCore/QtCore>

class Monitor : public QObject
{
    Q_OBJECT
public:
    explicit Monitor(QObject *parent = 0);

signals:


public slots:
    void error(QProcess::ProcessError error);
    void 	finished(int exitCode, QProcess::ExitStatus exitStatus);
    void 	readyReadStandardError();
    void 	readyReadStandardOutput();
    void 	started();
};

#endif // MONITOR_H