QT-串口操作

修改.pro文件

添加如下所示代码

QT       += serialport

编写.h文件

1、添加头文件

#include <QtSerialPort>

2、添加串口定义

QSerialPort *serialPort;

源文件代码

1、添加头文件

#include  <QSerialPort>
#include <QSerialPortInfo>

2、搜索串口

void MainWindow::on_btn_find_seriaport_clicked()
{
    const auto infos = QSerialPortInfo::availablePorts();
    ui->cbx_com_name->clear();
    for(const QSerialPortInfo &info : infos)
    {
        QSerialPort serial;
        serial.setPort(info);
        if(serial.open(QIODevice::ReadWrite))
        {
           ui->cbx_com_name->addItem(info.portName());
           serial.close();
        }
    }
}

3、打开串口

void MainWindow::on_btn_open_port_clicked()
{
    if (ui->btn_open_port->text() == tr("打开串口"))
      {
          serialPort = new QSerialPort;
          serialPort->setPortName(ui->cbx_com_name->currentText());
          if(serialPort->open(QIODevice::ReadWrite))
          {
              serialPort->setBaudRate(ui->cbx_bandrate->currentText().toInt());
              serialPort->setStopBits(to_convert_stopbit(ui->cbx_stopbit->currentText()));
              serialPort->setDataBits(to_convert_databit(ui->cbx_databit->currentText()));
              serialPort->setParity(to_convert_paritybit(ui->cbx_paritybit->currentText()));
              ui->btn_open_port->setText(tr("关闭串口"));
              ui->cbx_bandrate->setEnabled(false);
              ui->cbx_stopbit->setEnabled(false);
              ui->cbx_databit->setEnabled(false);
              ui->cbx_paritybit->setEnabled(false);
              ui->cbx_com_name->setEnabled(false);
              ui->btn_find_seriaport->setEnabled(false);
              connect(serialPort, &QSerialPort::readyRead, this, &MainWindow::ReadData);
          }
          else
          {
              QMessageBox::critical(this, tr("Error"), serialPort->errorString());
          }
      }
      else
      {
          serialPort->clear();
          serialPort->close();
          serialPort->deleteLater();

          ui->btn_open_port->setText(tr("打开串口"));
          ui->cbx_bandrate->setEnabled(true);
          ui->cbx_stopbit->setEnabled(true);
          ui->cbx_databit->setEnabled(true);
          ui->cbx_paritybit->setEnabled(true);
          ui->cbx_com_name->setEnabled(true);
          ui->btn_find_seriaport->setEnabled(true);
      }
}

4、发送数据


void MainWindow::on_btn_send_message_clicked()
{
    serialPort->write(ui->tex_send_text->toPlainText().toLocal8Bit());
}

5、接收数据

void MainWindow::ReadData()
{
    static int reNum = 0;
    QByteArray buf;
    buf = serialPort->readAll();

    if (!buf.isEmpty())
    {
        reNum += buf.size();
        QString myStrTemp = QString::fromLocal8Bit(buf); //支持中文显示
        QString str = ui->tex_recv_text->toPlainText();
        str +=myStrTemp;
        ui->tex_recv_text->clear();
        ui->tex_recv_text->append(str);
    }
    buf.clear();
}

6、数据位，校验位，停止位转换代码

QSerialPort::StopBits MainWindow::to_convert_stopbit(QString  bit)
{
   if(bit == tr("1"))
       return QSerialPort::OneStop;
   else if (bit == tr("1.5"))
       return QSerialPort::OneAndHalfStop;
   else if (bit == tr("2"))
       return QSerialPort::TwoStop;
   return QSerialPort::OneStop;
}

QSerialPort::DataBits MainWindow::to_convert_databit(QString  bit)
{
   if(bit == tr("8"))
       return QSerialPort::Data8;

   if(bit == tr("7"))
       return QSerialPort::Data7;

   if(bit == tr("6"))
       return QSerialPort::Data6;

   if(bit == tr("5"))
       return QSerialPort::Data5;
   return QSerialPort::Data8;
}

QSerialPort::Parity MainWindow::to_convert_paritybit(QString  bit)
{
   if(bit == tr("None"))
       return QSerialPort::NoParity;
   if(bit == tr("Odd"))
       return QSerialPort::OddParity;
   if(bit == tr("Even"))
       return QSerialPort::EvenParity;
    return QSerialPort::NoParity;
}

DEMO：https://gitee.com/zyzp/QT-SerialPort