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QProcess proc;
proc.start(prog, params);

proc.terminate();
//proc.kill();

if (proc.state == QProcess::Running)
    QMessageBox::critical(this, "", "Running");
// Выводит Running

namespace Ui {
class Controlpanel;
}

class Controlpanel : public QWidget
{
    Q_OBJECT
    
public:
    explicit Controlpanel(QWidget *parent = 0);
    ~Controlpanel();
    QProcess proc;

public slots:
    void readOut();
    void exitProc(int, QProcess::ExitStatus);

private:
    Ui::Controlpanel *ui;
    void init();

protected:
    bool eventFilter(QObject * ,QEvent * );

};

Controlpanel::Controlpanel(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Controlpanel)
{
    ui->setupUi(this);
    init();
}

void Controlpanel::init()
{
    this->installEventFilter(this);
    connect(&proc,SIGNAL(readyReadStandardOutput()),this,SLOT(readOut()));
    connect(&proc,SIGNAL(finished(int,QProcess::ExitStatus)),this,SLOT(exitProc(int,QProcess::ExitStatus)));
}

bool Controlpanel::eventFilter(QObject *obj, QEvent *event)
{
        if( event->type() == QEvent::KeyPress)
           {
                QKeyEvent *keyEvent = static_cast<QKeyEvent*>( event );
                switch (keyEvent->key()) {
                case 48: // "0"
		    if (proc.state() == QProcess::NotRunning)
			QMessageBox::critical(this, "" , "NOT RUNNING!");
		    if (proc.state() == QProcess::Running)
			QMessageBox::critical(this,"","RUNNING!");
		    if (proc.state() == QProcess::Starting)
			QMessageBox::critical(this, "", "STARTING!");
		    
                    if (proc.state() != QProcess::Running) {
                        proc.start("/home/steerage/Steerage", QStringList() << "-qt3");
                	QMessageBox::critical(this,"","Starting");
		    } else
		    	if (proc.state() == QProcess::Running) {
                            proc.terminate();
                            //proc.kill();
			    QMessageBox::critical(this,"","Terminating");
			}
		    break;
		default:
                    break;
                }
           }
        return QObject::eventFilter(obj, event);
}

void Controlpanel::readOut()
{
    QByteArray arr;
    arr = proc.readAllStandardOutput();
    if ((QChar(arr[0]) == QChar('4')) && (QChar(arr[1]) == QChar('8')))
	proc.terminate();
        //proc.kill();
    else
	QMessageBox::critical(this,"",QString(arr));
}

void Controlpanel::exitProc(int exCode, QProcess::ExitStatus exStat) {
    QMessageBox::critical(this, "", "The process was finished");
}

if (proc.state() != QProcess::Running) {
                        proc.start("/home/steerage/Steerage", QStringList() << "-qt3");
                	QMessageBox::critical(this,"","Starting");
		    }