Qt一个进程运行另一个进程的实现方法

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include 
#include 

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:
    void on_pushButton_clicked();

    void showResult();
    void showState(QProcess::ProcessState state);
    void showError();
    void showFinished(int,QProcess::ExitStatus);

private:
    Ui::MainWindow *ui;

    QProcess myProcess;
};

#endif // MAINWINDOW_H

#include \"mainwindow.h\"
#include \"ui_mainwindow.h\"
#include 
#include 

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    //添加信号和槽的关联
    connect(&myProcess,&QProcess::readyRead,this,&MainWindow::showResult);
    connect(&myProcess,&QProcess::stateChanged,this,&MainWindow::showState);
    connect(&myProcess,&QProcess::errorOccurred,this,&MainWindow::showError);
    connect(&myProcess,SIGNAL(finished(int,QProcess::ExitStatus)),
                              this,SLOT(showFinished(int,QProcess::ExitStatus)));
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_pushButton_clicked()
{
    //启动记事本程序，由于它在Windows的系统目录下，该目录已经加在了系统PATH环境变量中，所以不需要写具体路径
    //myProcess.start(\"notepad.exe\");

    QString program = \"cmd.exe\";
    QStringList arguments;
    arguments<<\"/c dir&pause\";
    myProcess.start(program,arguments);
}

void MainWindow::showResult()
{
    QTextCodec * codec = QTextCodec::codecForLocale();
    qDebug()<<\"showResult: \"<toUnicode(myProcess.readAll());
}

void MainWindow::showState(QProcess::ProcessState state)
{
    qDebug()<<\"showState: \";
    if(state == QProcess::NotRunning)
    {
        qDebug()<<\"No Running\";
    }
    else if(state == QProcess::Starting)
    {
        qDebug()<<\"Starting\";
    }
    else
    {
        qDebug()<<\"Running\";
    }
}

void MainWindow::showError()
{
    qDebug()<<\"showError:\"<