34.QT- Make a serial assistant (and dynamically detected the online serial port, with source code)

#include "widget.h"
#include "ui_widget.h"
Widget::Widget(QWidget *parent) :
 QWidget(parent),
 ui(new Ui::Widget)
{
 ui->setupUi(this);
 setWindowTitle(("Simple Serial Port Tool"));
 ui->recvEdit- >setReadOnly(true);
 initBtn();
 initComboBoxs();
 initSerial();
 qApp->setStyleSheet("QComboBox::item{text-align: center ; }");
}

void Widget::initBtn() //Initialize button
{
 Change_btn_isOn(false);
}

void Widget::initComboBoxs() //Initialize the drop-down list box
{
 BaudRateType RateTypes[12]={
 BAUD1200,BAUD2400 ,BAUD4800,BAUD9600 ,
 BAUD14400,BAUD19200,BAUD38400,BAUD56000,
 BAUD57600,BAUD115200,BAUD128000, BAUD256000};
 DataBitsType BitsTypes[4]={DATA_5,DATA_6, DATA_7, DATA_8};
 for(int i =0;i<12;i++)
 {
 ui->serial_baud->addItem(QString("%1").arg((int)RateTypes[i]),RateTypes[i]) ;
 }

 for(int i=0;i<4;i++)
 {
 ui->serial_data->addItem(QString("%1").arg((int)BitsTypes[i]),BitsTypes [i]);
 }

 ui->serial_parity->addItem("None",PAR_NONE);
 ui->serial_parity->addItem("odd parity" ,PAR_ODD);
 ui->serial_parity->addItem("even parity",PAR_EVEN);

 ui->serial_stop->addItem("1",STOP_1);
 ui->serial_stop->addItem("1.5",STOP_1_5);
 ui->serial_stop->addItem("2",STOP_2);
}

void Widget::initSerial() //Initialize the serial port
{
 onPortAddedOrRemoved();
 enumerator =new QextSerialEnumerator();
 enumerator->setUpNotifications();
< br /> connect(enumerator, SIGNAL(deviceDiscovered(QextPortInfo)),this, SLOT(onPortAddedOrRemoved())); //A serial port was found
 connect(enumerator, SIGNAL(deviceRemoved(QextPortInfo)), this, SLOT( onPortAddedOrRemoved())); //Found that there is no serial port

 port =new QextSerialPort(QextSerialPort::EventDriven,this);
 connect(port, SIGNAL(readyRead( )), this,SLOT(readLineData())); //Connect signal
}

void Widget::on_btn_send_clicked() //Send data
{
 if (port->isOpen() && !ui->sendEdit->toPlainText().isEmpty())
 {
 QString data =ui->sendEdit->toPlainText();
 data+="
";
 }
}

void Widget::on_betn_clear_clicked()//Clear the received data
{
 ui- >recvEdit->clear();
}

void Widget::on_btn_switch_clicked()//Serial port switch
{if(!port->isOpen()) //Current Not open
 {
 Change_btn_isOn(true);
 port->setPortName(ui->serial_name->itemData(ui->serial_name->currentIndex()).toString());< br /> port->setBaudRate((BaudRateType)ui->serial_baud->itemData(ui->serial_baud->currentIndex()).toInt());
 port->setDataBits((DataBitsType)ui-> serial_data->itemData(ui->serial_data->currentIndex()).toInt());
 port->setParity((ParityType)ui->serial_parity->itemData(ui->serial_parity->currentIndex() ).toInt());
 port->setSt opBits((StopBitsType)ui->serial_stop->itemData(ui->serial_stop->currentIndex()).toInt());
 port->open(QIODevice::ReadWrite);
 }< br /> else
 {
 Change_btn_isOn(false);
 port->close();
 }
}

void Widget: :closeEvent(QCloseEvent *)
{
 if(port->isOpen())
 port->close();
}

void Widget ::readLineData() //Read data
{
 while(port->canReadLine()) {
 ui->recvEdit->moveCursor(QTextCursor::End);
 ui->recvEdit->insertPlainText(QString::fromLocal8Bit(port->readLine()));
 }
}

void Widget::onPortAddedOrRemoved() //Refresh Serial number
{
 QString current =ui->serial_name->currentText();
 ui->serial_name->blockSignals(true); //Blocking signals
 ui-> serial_name->clear();

 foreach (QextPortInfo info, QextSerialEnumerator::getPorts())
 {
 QString friendname = inf o.friendName;
 int end=friendname.lastIndexOf(" ");
 if(end!=-1)
 {
 ui->serial_name->addItem(QString( "%1:%2").arg(info.portName).arg(info.friendName.left(end)),info.portName);
 }
 else
 {
 ui->serial_name->addItem(QString("%1:%2").arg(info.portName).arg(info.friendName),info.portName);
 }
} 

 ui->serial_name->setCurrentIndex(ui->serial_name->findText(current));
 if(ui->serial_name->currentIndex()==-1)
 ui->serial_name->setCurrentIndex(0);
 ui->serial_name->blockSignals(false); //Turn off blocking
}

void Widget::Change_btn_isOn (bool ison)
{
 if(!ison)
 {
 ui->btn_switch->setStyleSheet("color:blue;border: 1px solid blue");
 ui->btn_switch->setText("Open the serial port");
 }
 else
 {
 ui->btn_switch->setStyleSheet("color:red;border: 1px solid red");
 ui->btn_switch->s etText("Close serial port");
 }
}

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

void Widget::on_serial_name_currentIndexChanged(int index)
{
 if (port->isOpen()) {//If it is open, close the serial port
 port->close();
 Change_btn_isOn(false);
 }
}

Article source: https://www.cnblogs.com/lifexy /p/9273352.html