Qt5--串口应用--多线程读写串口（2）

╰半夏微凉° 2023-05-30 09:13 78阅读 0赞

自己写的，淌过很多坑。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9saWVmeXVhbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70]

mainwindow.cpp

#include "mainwindow.h"
    #include "ui_mainwindow.h"
    
    MainWindow::MainWindow(QWidget *parent) :
        QMainWindow(parent),
        ui(new Ui::MainWindow)
    { 
        ui->setupUi(this);
    
        //查找可用的串口
        foreach(const QSerialPortInfo &info, QSerialPortInfo::availablePorts())
        { 
            QSerialPort serial;
            serial.setPort(info);
            if(serial.open(QIODevice::ReadWrite))
            { 
                ui->PortBox->addItem(serial.portName());
                serial.close();
            }
        }
        //设置波特率下拉菜单默认显示第一项
        ui->BaudBox->setCurrentIndex(0); // 115200
    }
    
    MainWindow::~MainWindow()
    { 
        delete ui;
    }
    
    void MainWindow::on_openButton_clicked()
    { 
        if(ui->openButton->text()=="open")
        { 
            mthread =new SerialThread(ui->PortBox->currentText(), ui->BaudBox->currentText().toInt());
    
            connect(mthread,SIGNAL(senddata(QByteArray)),this,SLOT(on_showData(QByteArray)),Qt::QueuedConnection);
    
            //接收子线程传输数据的信号
    
            mthread->run();//开启子线程
    
            //关闭设置菜单使能
            ui->PortBox->setEnabled(false);
            ui->BaudBox->setEnabled(false);
    
            ui->openButton->setText("close");
        }
        else
        { 
            //关闭串口
            mthread->close_mthread_serial();
    
            //恢复设置使能
            ui->PortBox->setEnabled(true);
            ui->BaudBox->setEnabled(true);
            ui->openButton->setText("open");
        }
    }
    
    void MainWindow::on_showData(QByteArray value)
    { 
        ui->textEdit->append(value);
    }

mainwindow.h

#ifndef MAINWINDOW_H
    #define MAINWINDOW_H
    
    #include <QMainWindow>
    #include <QtSerialPort/QSerialPort>
    #include <QtSerialPort/QSerialPortInfo>
    #include <QThread>
    #include "serialthread.h"
    
    namespace Ui { 
    class MainWindow;
    }
    
    class MainWindow : public QMainWindow
    { 
        Q_OBJECT
    
    public:
        explicit MainWindow(QWidget *parent = nullptr);
        ~MainWindow();
    
    private slots:
        void on_openButton_clicked();
    
        void on_showData(QByteArray value);
    
    private:
        Ui::MainWindow *ui;
        QSerialPort *serial;
        SerialThread *mthread;
    };
    
    #endif // MAINWINDOW_H

serialthread.cpp

#include "serialthread.h"
    
    SerialThread::SerialThread(QString port, long baud)
    { 
        myport = port;
        myBaud = baud;
    }
    
    
    void SerialThread::run()
    
    { 
        //重写run()函数初始化串口
        serial = new QSerialPort();
    
        serial->setPortName(myport);
    
        serial->open(QIODevice::ReadWrite);//读写方式打开
    
        serial->setBaudRate(myBaud);//波特率
    
        serial->setDataBits(QSerialPort::Data8);//数据位
    
        serial->setParity(QSerialPort::NoParity);//奇偶校验
    
        serial->setStopBits(QSerialPort::OneStop);//停止位
    
        serial->setFlowControl(QSerialPort::NoFlowControl);//控制位
    
        connect(serial, SIGNAL(readyRead()), this, SLOT(read_serial_data()), Qt::QueuedConnection);//有数据就读
    
    }
    
    void SerialThread::read_serial_data()
    { 
        if(serial->bytesAvailable()>= 9)
        { 
            QByteArray temp;
    
            temp = serial->read(9);//每串数据为9个字节
    
            emit senddata(temp);//发送数据给主线程
    
    // qDebug() << temp ;
          }
    }
    
    void SerialThread::close_mthread_serial(void)
    
    { 
        qDebug() <<"close ok"<<endl;
    
        serial->clear();
    
        serial->close();//关闭子线程
    
        serial->deleteLater();
    }

serialthread.h

#ifndef SERIALTHREAD_H
    #define SERIALTHREAD_H
    
    #include <QObject>
    #include <QThread>
    #include <QWaitCondition>
    #include <QMutex>
    #include <QDebug>
    #include <QtSerialPort/QSerialPort>
    #include <QtSerialPort/QSerialPortInfo>
    
    
    class SerialThread : public QThread
    { 
        Q_OBJECT
    
    public:
        SerialThread(QString port, long baud);
    
        void run();
    
    
    signals:
    
        void senddata(QByteArray data);//向主线程发送接收到的串口数据
    
    public slots:
    
        void read_serial_data();//读取串口数据
    
        void close_mthread_serial();//关闭
    
    private:
    
        QSerialPort *serial;
    
        QString myport;
        long myBaud;
    
        float data;
    };
    
    #endif // SERIALTHREAD_H

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9saWVmeXVhbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191109015822811.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9saWVmeXVhbi5ibG9nLmNzZG4ubmV0,size_16,color_FFFFFF,t_70