QT编写的串口收发程序

#include "mainwindow.h" #include "ui_mainwindow.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); //查找可用的串口 foreach (const QSerialPortInfo &info,QSerialPortInfo::availablePorts()) { QSerialPort serial; serial.setPort(info); if(serial.open(QIODevice::ReadWrite)) { ui->portBox->addItem(serial.portName()); serial.close(); } } ui->BaudBox->setCurrentIndex(4); } MainWindow::~MainWindow() { delete ui; } void MainWindow::on_openButton_clicked() { serial = new QSerialPort; serial->setPortName(ui->portBox->currentText());//设置串口名 serial->open(QIODevice::ReadWrite);//以读写方式打开串口 int baudindex=ui->BaudBox->currentIndex(); switch (baudindex) { case 0: serial->setBaudRate(QSerialPort::Baud4800);//设置波特率 break; case 1: serial->setBaudRate(QSerialPort::Baud9600); break; case 2: serial->setBaudRate(QSerialPort::Baud19200); break; case 3: serial->setBaudRate(QSerialPort::Baud38400); break; case 4: serial->setBaudRate(QSerialPort::Baud115200); break; default: break; } if(ui->bitBox->currentText()=="8") serial->setDataBits(QSerialPort::Data8); else if(ui->bitBox->currentText()=="7") serial->setDataBits(QSerialPort::Data7); else if(ui->bitBox->currentText()=="6") serial->setDataBits(QSerialPort::Data6); else if(ui->bitBox->currentText()=="5") serial->setDataBits(QSerialPort::Data5); if(ui->portBox->currentIndex()==0) serial->setParity(QSerialPort::NoParity); else if(ui->ParityBox->currentIndex()==1) serial->setParity(QSerialPort::OddParity); else if(ui->ParityBox->currentIndex()==2) serial->setParity(QSerialPort::EvenParity); if(ui->StopbitBox->currentIndex()==0) serial->setStopBits(QSerialPort::OneStop); else if(ui->StopbitBox->currentIndex()==1) serial->setStopBits(QSerialPort::OneAndHalfStop); else if(ui->StopbitBox->currentIndex()==2) serial->setStopBits(QSerialPort::TwoStop); serial->setFlowControl(QSerialPort::NoFlowControl); ui->portBox->setEnabled(false); ui->BaudBox->setEnabled(false); ui->bitBox->setEnabled(false); ui->StopbitBox->setEnabled(false); ui->ParityBox->setEnabled(false); ui->openButton->setEnabled(false); ui->closeButton->setEnabled(true); flag=1; QObject::connect(serial,&QSerialPort::readyRead,this,&MainWindow::ReadData); } void MainWindow::ReadData() { QByteArray buf; buf = serial->readAll(); if(!buf.isEmpty()) { QString str = ui->receiveDataTextEdit->toPlainText(); str+=tr(buf); ui->receiveDataTextEdit->clear(); ui->receiveDataTextEdit->append(str); } buf.clear(); } void MainWindow::on_closeButton_clicked() { serial->clear(); serial->close(); serial->deleteLater(); ui->portBox->setEnabled(true); ui->bitBox->setEnabled(true); ui->BaudBox->setEnabled(true); ui->StopbitBox->setEnabled(true); ui->ParityBox->setEnabled(true); ui->closeButton->setEnabled(false); ui->openButton->setEnabled(true); flag=0; } void MainWindow::on_sendSpeedButton_clicked() { if(flag==0){ QMessageBox::warning(NULL, "warning", "Please open the USART", QMessageBox::Yes | QMessageBox::No, QMessageBox::Yes); return; } int i =0; QByteArray data=ui->lineEdit->text().toLatin1(); int size = data.size(); QByteArray temp; temp.resize(size+5); temp[0]='1'; for(i=1;i<=size;i++){ temp[i]=data[i-1]; } temp[size+1]='0'; temp[size+2]='0'; temp[size+3]= '\r'; temp[size+4]='\n'; QByteArray senddata; senddata = temp.data (); serial->write(senddata); } QByteArray MainWindow::StringToHex(QString str) //字符串转换为十六进制数据0-F { 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(!QChar::isLetterOrNumber(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; } char MainWindow::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 ch-ch;//不在0-f范围内的会发送成0 }