Why this code doesn't work?

[prykHetQuo]

Qt version: 4.4.3.

OS: Ubuntu Linux Desktop Edition 8.10 x86.

The following code does not insert the "ls -hal" output to the QTextEdit object. The QTextEdit object appears empty. Why?

A screenshot is attached.

#include <QApplication>
#include <QDialog>
#include <QProcess>
#include "ui_qsysv-rc-conf.h"
 
int main(int argc, char *argv[])
{
      QApplication app(argc, argv);
 
      Ui::Dialog ui;
 
      QDialog *dialog= new QDialog;
 
      ui.setupUi(dialog);
 
      dialog->show();
 
 
      QProcess *sysvProcess = new QProcess(dialog);
 
      sysvProcess->start("ls -hal");
 
      const QByteArray &input= sysvProcess->readAllStandardOutput();
 
      ui.textEdit->setText(QString(input));
 
 
      app.exec();
 
      return 0;
}

#include <QApplication>
#include <QDialog>
#include <QProcess>
#include "ui_qsysv-rc-conf.h"

int main(int argc, char *argv[])
{
      QApplication app(argc, argv);

      Ui::Dialog ui;

      QDialog *dialog= new QDialog;

      ui.setupUi(dialog);

      dialog->show();
      
      
      QProcess *sysvProcess = new QProcess(dialog);

      sysvProcess->start("ls -hal");
      
      const QByteArray &input= sysvProcess->readAllStandardOutput();
      
      ui.textEdit->setText(QString(input));
      
  
      app.exec();
 
      return 0;
}

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[Corinzio]

Try use QProcess::waitForFinished maybe your QProcess sysvProcess has not alreasy written anything to stdoutput when you call readAllStandardOutput().

[GuL]

try something like this:

QString prog = "/bin/bash";
	QStringList arguments;
	arguments << "-c" << "ls -hal";
	QProcess* process = new QProcess(this);
	process->start(prog , arguments);
	process->waitForFinished();
 
	QString tmp = process->readAll();
	qDebug() << tmp;
	ui.textEdit->setText(tmp);

QString prog = "/bin/bash";
	QStringList arguments;
	arguments << "-c" << "ls -hal";
	QProcess* process = new QProcess(this);
	process->start(prog , arguments);
	process->waitForFinished();
 
	QString tmp = process->readAll();
	qDebug() << tmp;
	ui.textEdit->setText(tmp);

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