一、項(xiàng)目需求

用QT開發(fā)一個(gè)串口小助手，要求能實(shí)現(xiàn)串口接收，發(fā)送等基本功能。

二、UI界面設(shè)計(jì)

三、源碼實(shí)現(xiàn)

3.1 mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H


#include 
#include 
#include 


QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE


class MainWindow : public QMainWindow
{
    Q_OBJECT


public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();


private slots:
    void onClickedButtun();
    void readData();
    void clearReceiveWindow();
    void on_sendButtun_clicked();
    void clearSendWindow();


private:
    Ui::MainWindow *ui;
    QSerialPort *m_serial = nullptr;


};
#endif // MAINWINDOW_H

3.2 mainwindow.cpp

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


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


    //自動(dòng)識(shí)別并顯示當(dāng)前存在的串口號(hào)
    const auto infos = QSerialPortInfo::availablePorts();
    for(const QSerialPortInfo &info:infos)
        ui->serialPortNamecomboBox->addItem(info.portName());


    //添加波特率下拉菜單
    const QString serialBaudrate[9]={"2400","4800","9600","14400","19200","38400","56000","57600","115200"};
    for(int i = 0 ; i < 9 ; i++)
    {
        ui->serialBaudratecomboBox->addItem(serialBaudrate[i]);
    }




    connect(ui->serialOnClickpushButton,&QPushButton::clicked,this,&MainWindow::onClickedButtun);
    connect(ui->serialCleanReceivepushButton,&QPushButton::clicked,this,&MainWindow::clearReceiveWindow);
    connect(ui->serialSendpushButton,&QPushButton::clicked,this,&MainWindow::on_sendButtun_clicked);
    connect(ui->serialCleanSendpushButton,&QPushButton::clicked,this,&MainWindow::clearSendWindow);
}


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


/*
*@brief:按鈕控制函數(shù)，控制串口的開和關(guān)
*@param:None
*@retval:None
*/
void MainWindow::onClickedButtun()
{
    if(ui->serialOnClickpushButton->text() == tr("打開串口"))
    {
        m_serial = new QSerialPort;


        //設(shè)置串口名
        m_serial->setPortName(ui->serialPortNamecomboBox->currentText());


        //打開串口
        m_serial->open(QIODevice::ReadWrite);


        //設(shè)置波特率
        m_serial->setBaudRate(ui->serialBaudratecomboBox->currentIndex());


        //連接信號(hào)槽
        connect(m_serial,&QSerialPort::readyRead,this,&MainWindow::readData);


        ui->serialPortNamecomboBox->setEnabled(false);
        ui->serialBaudratecomboBox->setEnabled(false);
        ui->serialOpenradioButton->toggle();


        ui->serialOnClickpushButton->setText(tr("關(guān)閉串口"));
    }
    else
    {
        //關(guān)閉串口
        m_serial->clear();
        m_serial->close();
        m_serial->deleteLater();


        //恢復(fù)設(shè)置使能
        ui->serialPortNamecomboBox->setEnabled(true);
        ui->serialBaudratecomboBox->setEnabled(true);
        ui->serialOpenradioButton->toggle();
        ui->serialOnClickpushButton->setText(tr("打開串口"));
    }
}


/*
*@brief:讀取數(shù)據(jù)函數(shù)
*@param:None
*@retval:None
*/
void MainWindow::readData()
{
    QByteArray data = m_serial->readAll();


    if(!data.isLower())
    {
        QString str = ui->serialReceivetextEdit->toPlainText();


//        str += tr(data);      //此寫法不支持中文
        str += QString::fromLocal8Bit(data);        //此寫法支持中文
        ui->serialReceivetextEdit->clear();
        ui->serialReceivetextEdit->append(str);
    }
}


/*
*@brief:清除接收窗口
*@param:None
*@retval:None
*/
void MainWindow::clearReceiveWindow()
{
    ui->serialReceivetextEdit->clear();
}


/*
*@brief:發(fā)送函數(shù)
*@param:None
*@retval:None
*/
void MainWindow::on_sendButtun_clicked()
{
//    m_serial->write(ui->serialSendtextEdit->toPlainText().toLatin1());      //此寫法不支持中文


    m_serial->write(ui->serialSendtextEdit->toPlainText().toLocal8Bit());   //此寫法支持中文
}


/*
*@brief:清除發(fā)送窗口
*@param:None
*@retval:None
*/
void MainWindow::clearSendWindow()
{
    ui->serialSendtextEdit->clear();
}

四、測(cè)試運(yùn)行

略