08 qt进程和网络编程（cs模型）

// process = new QProcess(this); //说明启动的额外的应用程序与当前qt应用程序是依赖关系
process = new QProcess;//说明启动的额外的应用程序与当前qt应用程序是无依赖关系，可以脱离你独立运行

void MainWindow::on_startButton_clicked()
{
  // process->start("C:/Users/PC/Desktop/FeiQ.exe"); //ok
   process->start("notepad"); //额外应用程序notepad就相当于process
}

void MainWindow::on_notepadButton_clicked()
{
    if(QProcess::Running == process->state())
    {
        process->kill();
        process->waitForFinished();
    }
    process->start("notepad");
}

void MainWindow::on_calcButton_clicked()
{
    if(QProcess::Running == process->state())
    {
        process->kill();
        process->waitForFinished();
    }
   process->start("calc");
}

void MainWindow::on_qtButton_clicked()
{
    if(QProcess::Running == process->state())
    {
        process->kill();
        process->waitForFinished();
    }
   process->start("C:/Users/PC/Desktop/Lucky_draw.exe");
}

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

    process = new QProcess;

    //当proces进程有数据可读取时，那么它会自动发送一个信号 readyRead()
    connect(process,&QProcess::readyRead,this,&MainWindow::readData);
}

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

void MainWindow::readData()
{
    qDebug() << "------";
  QByteArray data = process->readAll();
  qDebug() << data;
}

void MainWindow::on_startButton_clicked()
{
       process->start("ipconfig");
}

To link against the Qt Network module, add this line to the project file（.pro）:
  QT += network // 在当前工程中，增加网络，工程中才可以 使用网络接口API

const QString &hostName  ------ 》服务端的ip地址
quint16 port -----》服务端的端口号
const QHostAddress &address ------》服务端的主机对象，通用使用ip地址做为字符串参数，再使用构造函数来完成该对象的创建QHostAddress(const QString &address)

bool QTcpServer::
listen(const QHostAddress &address = QHostAddress::Any, quint16 port = 0)

QTcpSocket *QTcpServer::nextPendingConnection()