串口案例

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#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include <QSerialPort>

namespace Ui {

class MainWindow;

}

class MainWindow : public QMainWindow

{

    Q_OBJECT

public:

    explicit MainWindow(QWidget *parent = 0);

    ~MainWindow();

private slots:

    void on_pushButton_clicked();

    void spReadyRead();

private:

    Ui::MainWindow *ui;

    QSerialPort sp;

};

#endif // MAINWINDOW_H

#include "mainwindow.h"

#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

   // sp=new QSerialPort();

    sp.setPortName("COM3");

    sp.setBaudRate(QSerialPort::Baud9600);

    sp.setDataBits(QSerialPort::Data8);

    sp.setParity(QSerialPort::NoParity);

    sp.setStopBits(QSerialPort::OneStop);

    connect(&sp,QSerialPort::readyRead,this,MainWindow::spReadyRead);

}

MainWindow::~MainWindow()

{

    delete ui;

}

void MainWindow::on_pushButton_clicked()

{

    QString str=ui->lineEdit->text();

    if(!sp.isOpen())

    {

        sp.open(QSerialPort::ReadWrite);

    }

    sp.write(str.toLatin1());

}

void MainWindow::spReadyRead()

{

    ui->lineEdit_2->setText(sp.readAll());

}