Connect to output from QProcess? (Qt4)

[Kimm]

I'm trying to execute an application from another application (made using Qt4), using QProcess, and then tie into the output of the executed process and display it in a QTextEdit. This is how I am doing it (I'll try to post all relevant code, all of it is a bit much )

mainwindowimpl.h:

#ifndef MAINWINDOWIMPL_H
#define MAINWINDOWIMPL_H

#include "ui_mainwindow.h"
#include <QProcess>

class MainWindowImpl : public QMainWindow, public Ui::MainWindow
{
	Q_OBJECT
	public:
		MainWindowImpl( QWidget * parent = 0, Qt::WFlags f = 0 );
	private slots:
		void Start();
		void Output();
};

#endif

mainwindowimpl.cpp:

#include "mainwindowimpl.h"
#include <QtGui>

QProcess *app = new QProcess();

MainWindowImpl::MainWindowImpl(QWidget *parent, Qt::WFlags f) : QMainWindow(parent, f)
{
	setupUi(this);
	
	connect(app, SIGNAL(readyReadStandardOutput()), this, SLOT(Output()));
	
	connect(BtnStart, SIGNAL(clicked()), this, SLOT(Start()));
}

void MainWindowImpl::Start()
{
	QString xterm = "thunar";
	QStringList arguments;
	
	arguments<<"/home/kim/";
	
	app->start(xterm, arguments);
}

void MainWindowImpl::Output()
{
	OutText->setText(app->readAllStandardOutput());
}

Now, I can see in the terminal I launch my application from that Thunar prints something about D-Bus to the terminal, but nothing happens with my QTextEdit.

Ideas anyone? I'm kind of a novice with Qt and I've been googling to find an answer for quite a while

[Yalye99]

can anyone explain it?? thanks ...
using the connect(....,SIGNAL(readyread())....) works on windows...
why mac no??

thks.

[marriedto51]

At a first look, you are doing the right kind of thing to capture output from a command run in a QProcess. But I would not normally expect a GUI application (like Thunar) to write any output to standard output. Presumably what you see in your terminal has been written to standard error instead. If you want to capture both the standard output and standard error, then a cheap way to do that is to use something like

QProcess::setProcessChannelMode(QProcess::MergedChannels);

(See the documentation at http://http://qt-project.org/doc/qt-4.8/qprocess.html.)