QT接收串口温度数据，并显示成实时曲线

#include "widget.h" #include "ui_widget.h" char flag; Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget) { ui->setupUi(this); thread=new myThread(this); //resize(WINDOW_WIDTH,WINDOW_HEIGHT); // 窗口大小810x650 setFixedSize(WINDOW_WIDTH+160,WINDOW_HEIGHT-40); thread->start(); connect(thread,&myThread::updateImage,this,&Widget::getImage); connect(this,&Widget::destroyed,this,&Widget::dealClose); QStringList list; list<<"115200"<<"4800"<<"9600"; ui->comboBox2->addItems(list); foreach(const QSerialPortInfo &info, QSerialPortInfo::availablePorts()) // 查找可用的串口 { QSerialPort serial; serial.setPort(info); if(serial.open(QIODevice::ReadWrite)) { ui->comboBox->addItem(serial.portName()); serial.close(); } } } Widget::~Widget() { delete ui; } void Widget::paintEvent(QPaintEvent *) { QPainter painter(this); painter.drawImage(0,0,image); } void Widget::getImage(QImage temp) { image=temp; update(); } void Widget::dealClose() { isStop=1; thread->quit(); thread->wait(); } void Widget::Read_Data() { QByteArray array = serialAG->readAll(); // 获取对方发送的内容 QString temp1; temp1=QString(array); emit sendTemp(temp1); } void Widget::on_radioButton_clicked(bool checked) { if(checked) { serialAG=new QSerialPort(this); serialAG->setPortName(ui->comboBox->currentText()); serialAG->open(QIODevice::ReadWrite); serialAG->setBaudRate(ui->comboBox2->currentText().toInt()); serialAG->setDataBits(QSerialPort::Data8); serialAG->setStopBits(QSerialPort::OneStop); serialAG->setParity(QSerialPort::NoParity); serialAG->setFlowControl(QSerialPort::NoFlowControl); ui->comboBox2->setEnabled(0); ui->radioButton->setText("关闭串口"); connect(serialAG, &QSerialPort::readyRead, this, &Widget::Read_Data); connect(this,&Widget::sendTemp,this,&Widget::getTemp); connect(this,&Widget::sendTemp,thread,&myThread::getTemp2); } else { serialAG->clear(); serialAG->close(); serialAG->deleteLater(); ui->radioButton->setText("打开串口"); ui->comboBox2->setEnabled(1); } } void Widget::getTemp(QString xxTemp) { QDateTime current_date_time =QDateTime::currentDateTime(); QString current_date =current_date_time.toString("yyyy.MM.dd hh:mm:ss ddd"); QString temp2=xxTemp; QString path="../xag.txt"; if(path.isEmpty()==0) { QFile file(path); bool isOk=file.open(QIODevice::WriteOnly|QIODevice::Append); if(isOk==1) { if(flag==1) { flag=0; file.resize(0); // 清空 xAG.txt } file.write(current_date.toUtf8()+" Temp="+temp2.toUtf8()+"\r\n"); } file.close(); } } void Widget::on_pushButton_clicked() { QMessageBox::StandardButton rb = QMessageBox::warning(NULL, "warning", "Are you sure clear xag.txt?", QMessageBox::Yes | QMessageBox::No, QMessageBox::No); if(rb == QMessageBox::Yes) { flag=1; } }