基于QT5.13 的串口通信例程c/c++qq21489487的博客-

废话不多说直接上图，   其中包含系统时间获取显示  ；以及网址链接跳转功能；

串口开开启以及显示及发送方式；串口号是自动查询。所以选择好波特率就能使用，上图是我与stm8单片机通讯的示例，按照通讯协议单片机按照通讯协议回复。

下面是.h源程序：.h

 #ifndef PORT_H #define PORT_H  #include <QDialog> #include <QSerialPort> #include <QLabel> QT_BEGIN_NAMESPACE namespace Ui { class port; } QT_END_NAMESPACE  class port : public QDialog {     Q_OBJECT  public:     port(QWidget *parent = nullptr);     ~port();//释放 public:     bool portconfig(void);  private slots:     void on_CBoxSerialport_currentIndexChanged(const QString &arg1);     void on_Btnopen_clicked();      void on_BtnSend_clicked();     void on_SerialPort_readyRead();     void on_pushButton_clicked();     void time_update();      void on_BtnCleanRecv_clicked();      void on_btnweb_clicked();     QByteArray GetHexValue(QString str);     char ConvertHexChar(char ch);     void WriteMyCom();  private:     Ui::port *ui;     QSerialPort comport;     QSerialPort gloabal_port;     bool mIsOpen;     QString mpotName;     QString mbaurate;     QString mparity;     QString mdatabits;     QString mstopbits;     QLabel *currenTimLabel;   }; #endif // PORT_H 

下面是.pp源码：

 #include "port.h" #include "ui_port.h" #include "QDebug" #include "QSerialPortInfo" #include "QList" #include <QLabel> #include <QDateTime> #include <QString> #include <QTime> #include <QTimer> #include <QDate> #include <QUrl> #include <QDesktopServices> port::port(QWidget *parent)     : QDialog(parent)     , ui(new Ui::port) {     ui->setupUi(this);//布局设置到port中     mIsOpen = false;     ui->BtnSend->setEnabled(mIsOpen);   /*  ui->CBoxSerialport->addItem("COM1");     ui->CBoxSerialport->addItem("COM2");     ui->CBoxSerialport->addItem("COM3");     comport.setPortName("COM4");     comport.setBaudRate(QSerialPort::Baud38400); */     //自动查找已有串口     QList<QSerialPortInfo> serilPortInfo = QSerialPortInfo::availablePorts();     int count = serilPortInfo.count();     for (int i = 0;i < count; i++) {         ui->CBoxSerialport->addItem(serilPortInfo.at(i).portName());     }     connect(&comport,&QSerialPort::readyRead,this,&port::on_SerialPort_readyRead); //接收函数触发     //设置定时器     QTimer *timer = new QTimer(this);     timer->start(1000);   //每隔1000ms发送timeout的信号     connect(timer,SIGNAL(timeout()),this,SLOT(time_update()));      //获取日期时间并格式化    //可以不用     QDate::currentDate().toString("yyyy-MM-dd");     QTime::currentTime().toString("HH:mm:ss");     QTime::currentTime().toString("HH:mm:ss zzz");     QDateTime::currentDateTime().toString("yyyy-MM-DD HH:mm:ss");     QDateTime::currentDateTime().toString("yyyy-MM-dd HH:mm:ss:zzz");    // ui->btnweb->setText("百度");  } port::~port() {     delete ui; } //串口初始化 bool port::portconfig() {     //获取配置     mpotName = ui->CBoxSerialport->currentText();     mbaurate = ui->CBoxBaudrate->currentText();     mparity = ui->CBoxParity->currentText();     mdatabits = ui->CBoxDatabits->currentText();     mstopbits = ui->CBoxStopBits->currentText();     //设置配置     comport.setPortName(mpotName);     if("9600" == mbaurate)     {         comport.setBaudRate(QSerialPort::Baud9600);     }     if("19200" == mbaurate)     {         comport.setBaudRate(QSerialPort::Baud19200);     }     if("38400" == mbaurate)     {         comport.setBaudRate(QSerialPort::Baud38400);     }     if("57600" == mbaurate)     {         comport.setBaudRate(QSerialPort::Baud57600);     }     if("115200" == mbaurate)     {         comport.setBaudRate(QSerialPort::Baud115200);     }     if("NONE" == mparity)     {         comport.setParity(QSerialPort::NoParity);     }else if ("ODD" == mparity)     {         comport.setParity(QSerialPort::OddParity);     }     else     {         comport.setParity(QSerialPort::EvenParity);     }     if("5" == mdatabits)     {         comport.setDataBits(QSerialPort::Data5);     }else if("6" == mdatabits)     {         comport.setDataBits(QSerialPort::Data6);     }else if("7" == mdatabits)     {         comport.setDataBits(QSerialPort::Data7);     }else     {         comport.setDataBits(QSerialPort::Data8);     }     if("1.5" == mstopbits)     {         comport.setStopBits(QSerialPort::OneAndHalfStop);     }else if("2" == mstopbits)     {         comport.setStopBits(QSerialPort::TwoStop);     }else         {         comport.setStopBits(QSerialPort::OneStop);     }     return comport.open(QSerialPort::ReadWrite); } //打开串口 void port::on_Btnopen_clicked() {     if(true == mIsOpen)     {         comport.close();         ui->Btnopen->setText("打开");         mIsOpen = false;         ui->CBoxSerialport->setEnabled(true);         ui->CBoxBaudrate->setEnabled(true);         ui->CBoxParity->setEnabled(true);         ui->CBoxSerialport->setEnabled(true);         ui->BtnSend->setEnabled(false);     }else     {         if(portconfig() == true)         {             mIsOpen = true;             ui->Btnopen->setText("关闭");             qDebug()<<"成功打开串口"<<mpotName;             ui->CBoxSerialport->setEnabled(false);             ui->CBoxBaudrate->setEnabled(false);             ui->CBoxParity->setEnabled(false);             ui->CBoxSerialport->setEnabled(false);             ui->BtnSend->setEnabled(true);         }     } } //获取16进制的值 QByteArray port::GetHexValue(QString str) {     QByteArray senddata;     int hexdata,lowhexdata;     int hexdatalen = 0;     int len = str.length();     senddata.resize(len/2);     char lstr,hstr;     for (int i=0;i<len;)     {         hstr=str[i].toLatin1();         if(hstr==' ')         {             i++;             continue;         }         i++;         if(i>=len) break;         lstr = str[i].toLatin1();         hexdata = ConvertHexChar(hstr);         lowhexdata = ConvertHexChar(lstr);         if((hexdata==16)||(lowhexdata==16))             break;          else             hexdata = hexdata*16+lowhexdata;             i++;             senddata[hexdatalen]=(char)hexdata;             hexdatalen++;     }     senddata.resize(hexdatalen);     return senddata; } //数据转换 char port::ConvertHexChar(char ch) {     if((ch >= '0') && (ch <= '9'))         return ch-0x30;     else if((ch >= 'A') && (ch <= 'F'))         return ch-'A'+10;     else if((ch >= 'a') && (ch <= 'f'))         return ch-'a'+10;     else return (-1); } //发送函数  发送内容根据选择转成16进制发送  加结束符 以及换行 void port::WriteMyCom() {     QString str=ui->textEdit->toPlainText();     QByteArray outData=str.toLatin1();     int size = outData.size();     //QT中的回车只有一个字符n,而windows下需要解释为rn     if(outData[size-1]!='n')     {         outData.resize(size-1);         outData[size]='n';         outData[size+1]='n';     }     //默认16进制发送的数据没有加入回车符     if(ui->ckHexSend->isChecked())     {         outData=this->GetHexValue(str);         size=outData.size();         comport.write(outData);     }else     {         size=outData.size();         comport.write(outData);     } } //发送 void port::on_BtnSend_clicked() {     if(mIsOpen == true)     {         this->WriteMyCom();     } } //读取并显示 void port::on_SerialPort_readyRead() {     QByteArray recv = comport.readAll();     if(ui->ckHexRecv->isChecked())     {                                              // 转成16进制 // 字母大写// 不覆盖的追加显示        ui->textRecv->insertPlainText(QByteArray(recv.toHex(' ').toUpper().append(' ')));     }else {        ui->textRecv->append(QString(recv));     } } //清除发送内容 void port::on_pushButton_clicked() {     ui->textEdit->clear(); } //清除显示内容 void port::on_BtnCleanRecv_clicked() {     ui->textRecv->clear();  } //时间更新函数 void port::time_update() {     QString time;     time=QDateTime::currentDateTime().toString("yyyy-MM-dd HH:mm:ss");     ui->labtime->setText(QString(time)); } //打开网址连接 void port::on_btnweb_clicked() {     QDesktopServices::openUrl(QString("www.baidu.com")); } 

 本人小白学习中，不足之处望见怪。 

源程序链接：https://download.csdn.net/download/qq_21489487/12408241

本人使用的QT5.13.此处作为备注。以后方便查看。