QT 串口

串口的实现。

1、在.pro文件内加入

QT       += serialport

2、.h文件

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QSerialPort>
#include <QSerialPortInfo>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

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

private slots:
    void readData();

    void on_openSerialPort_clicked();

    void on_sendData_clicked();

private:
    Ui::MainWindow *ui;
    QSerialPort *serial = nullptr;
};

#endif // MAINWINDOW_H

.cpp文件

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    foreach (const QSerialPortInfo &info, QSerialPortInfo::availablePorts())
    {
        serial->setPort(info);
        qDebug() << "Name : " << info.portName();
        qDebug() << "Description : " << info.description();
        qDebug() << "Manufacturer: " << info.manufacturer();
        qDebug() << "Serial Number: " << info.serialNumber();
        qDebug() << "System Location: " << info.systemLocation();
    }
}

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

void MainWindow::readData()
{
    QByteArray buf;
    buf = serial->readAll();
    if(!buf.isEmpty())
    {
        QString str = ui->textEdit->toPlainText();
        str+=tr(buf);
        ui->textEdit->clear();
        ui->textEdit->append(str);
    }
    buf.clear();
}

void MainWindow::on_openSerialPort_clicked()
{
    if(ui->openSerialPort->text() == "打开串口"){
        serial = new QSerialPort;
        // 设置串口名
        serial->setPortName(ui->comboBox->currentText());
        // 打开串口
        serial->open(QIODevice::ReadWrite);
        // 设置波特率
        serial->setBaudRate(QSerialPort::Baud115200);
        // 设置数据位
        switch (ui->comboBox_3->currentIndex()) {
        case 0:
            serial->setDataBits(QSerialPort::Data5);
            break;
        case 1:
            serial->setDataBits(QSerialPort::Data6);
            break;
        case 2:
            serial->setDataBits(QSerialPort::Data7);
            break;
        case 3:
            serial->setDataBits(QSerialPort::Data8);
            break;
        default:
            break;
        }
        // 设置校验位
        switch (ui->comboBox_4->currentIndex()) {
        case 0:
            serial->setParity(QSerialPort::NoParity);
            break;
        case 1:
            serial->setParity(QSerialPort::OddParity);
            break;
        case 2:
            serial->setParity(QSerialPort::EvenParity);
            break;
        case 3:
            serial->setParity(QSerialPort::MarkParity);
            break;
        case 4:
            serial->setParity(QSerialPort::SpaceParity);
            break;
        default:
            break;
        }
        // 设置停止位
        switch (ui->comboBox_5->currentIndex()) {
        case 0:
            serial->setStopBits(QSerialPort::OneStop);
            break;
        case 1:
            serial->setStopBits(QSerialPort::OneAndHalfStop);
            break;
        case 2:
            serial->setStopBits(QSerialPort::TwoStop);
            break;
        default:
            break;
        }
        // 设置流控制
        serial->setFlowControl(QSerialPort::NoFlowControl); // 设置为无流控制
        ui->comboBox->setEnabled(false);
        ui->comboBox_2->setEnabled(false);
        ui->comboBox_3->setEnabled(false);
        ui->comboBox_4->setEnabled(false);
        ui->comboBox_5->setEnabled(false);
        ui->openSerialPort->setText("关闭串口");
        QObject::connect(serial, SIGNAL(readyRead()), this, SLOT(readData()));
    }
    else{
        //关闭串口
        serial->clear();
        serial->close();
        serial->deleteLater();

        //恢复设置使能
        ui->comboBox->setEnabled(true);
        ui->comboBox_2->setEnabled(true);
        ui->comboBox_3->setEnabled(true);
        ui->comboBox_4->setEnabled(true);
        ui->comboBox_5->setEnabled(true);
        ui->openSerialPort->setText(tr("打开串口"));
    }
}

void MainWindow::on_sendData_clicked()
{
    serial->write(ui->textEdit_2->toPlainText().toLatin1());
}

ui的样式图