QT 串口通讯小白入门例程

#include "serial.h" #include "ui_serial.h" Serial::Serial(QWidget *parent) : QMainWindow(parent), ui(new Ui::Serial) { ui->setupUi(this); //user system_init(); } Serial::~Serial() { delete ui; } /*---------------------------------------- *functions * ---------------------------------------*/ void Serial::system_init() { globle_port.setParity(QSerialPort::NoParity); globle_port.setDataBits(QSerialPort::Data8); globle_port.setStopBits(QSerialPort::OneStop); //connect connect(ui->btn_open,&QPushButton::clicked,this,&Serial::btn_open_port); connect(ui->btn_close,&QPushButton::clicked,this,&Serial::btn_close_port); connect(ui->btn_send,&QPushButton::clicked,this,&Serial::btn_send_data); connect(&globle_port,&QSerialPort::readyRead,this,&Serial::receive_data); } /*---------------------------------------- *slots * ---------------------------------------*/ void Serial::btn_open_port(bool) { /*----------port name---------------*/ //qDebug()<<"调用成功"; qDebug()<<ui->cmb_port_name->currentIndex(); switch (ui->cmb_port_name->currentIndex()) { case 0: globle_port.setPortName("COM1"); break; case 1: globle_port.setPortName("COM2"); break; case 2: globle_port.setPortName("COM3"); break; case 3: globle_port.setPortName("COM4"); break; case 4: globle_port.setPortName("COM5"); break; case 5: globle_port.setPortName("COM6"); break; case 6: globle_port.setPortName("COM7"); break; default: globle_port.setPortName("COM8"); break; } /*-----------------baud rate--------------------*/ switch (ui->cmb_baud_rate->currentIndex()) { case 0: globle_port.setBaudRate(QSerialPort::Baud115200); break; case 1: globle_port.setBaudRate(QSerialPort::Baud57600); break; case 2: globle_port.setBaudRate(QSerialPort::Baud38400); break; case 3: globle_port.setBaudRate(QSerialPort::Baud19200); break; case 4: globle_port.setBaudRate(QSerialPort::Baud9600); break; case 5: globle_port.setBaudRate(QSerialPort::Baud4800); break; case 6: globle_port.setBaudRate(QSerialPort::Baud2400); break; default: globle_port.setBaudRate(QSerialPort::Baud1200); break; } //open globle_port.open(QIODevice::ReadWrite); //test globle_port.write("1"); ui->lab_status->setText("Connected"); } void Serial::btn_close_port(bool) { globle_port.close(); ui->lab_status->setText("Disconnected"); } /*-------------sending data-----------------*/ void Serial::btn_send_data(bool) { QString data=ui->line_send_data->text(); QByteArray array=data.toLatin1(); globle_port.write(array); } /*--------------receive data---------------*/ void Serial::receive_data() { QByteArray array = globle_port.readAll(); qDebug()<<array; ui->plainTextEdit->insertPlainText(QString(array)); // if(ui->checkBox->checkState()==Qt::Checked) // { // ui->plainTextEdit->insertPlainText(QString(array.toHex(' ').toUpper().append(' '))); // }else // { // ui->plainTextEdit->insertPlainText(QString(array)); // } // //ui->plainTextEdit->insertPlainText(QString(array)); // ui->plainTextEdit->insertPlainText((QString(array))); // QByteArray ba("m");//查找m是第一个，"D=5.390m,32#\r\n" // qDebug()<<array.mid(2,array.indexOf(ba)-2); //打印需要的数字 // double a = array.mid(2,array.indexOf(ba)-2).toDouble(); // qDebug()<<a; }