串口助手

2019-11-08 19:43:22

字体：大中小

来源：转载

供稿：网友

//mainwindow.h#ifndef MAINWINDOW_H#define MAINWINDOW_H#include <QMainWindow>#include <QtSerialPort/QSerialPort>#include <QtSerialPort/QSerialPortInfo>namespace Ui {class MainWindow;}class MainWindow : public QMainWindow{ Q_OBJECTpublic: explicit MainWindow(QWidget *parent = 0); ~MainWindow(); char ConvertHexChar(char ch); void String2Hex(QString str, QByteArray &senddata);PRivate: Ui::MainWindow *ui; QSerialPort *my_serialport; bool isOpen;private slots: void my_readData(); //读取串口数据的槽 void my_sendData(); //发送数据的槽 void set_SerialPort();};#endif // MAINWINDOW_H//mainwindow.cpp#include "mainwindow.h"#include "ui_mainwindow.h"MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow){ ui->setupUi(this); isOpen = false; //遍历可用的串口 foreach (const QSerialPortInfo &info, QSerialPortInfo::availablePorts()) { QSerialPort serial; serial.setPort(info); //串口可打开则放到列表选项上 if (serial.open(QIODevice::ReadWrite)) { ui->PortComboBox->addItem(info.portName()); serial.close(); } } my_serialport= new QSerialPort();//初始化串口 QObject::connect(ui->OpenButton,SIGNAL(clicked(bool)),this,SLOT(set_SerialPort())); //打开按钮按下时触发 QObject::connect(my_serialport,SIGNAL(readyRead()),this,SLOT(my_readData())); //接收到数据时触发 QObject::connect(ui->SendButton,SIGNAL(clicked(bool)),this,SLOT(my_sendData())); //发送按钮按下时触发}MainWindow::~MainWindow(){ delete ui;}void MainWindow::my_readData(){ QByteArray requestData; requestData = my_serialport->readAll(); //读取数据 if(requestData!= NULL) { if(ui->HexCheckBox->isChecked()) { ui->ReceiveTextEdit->append(tr(requestData.toHex())); //使用16进制显示 } else { ui->ReceiveTextEdit->append(tr(requestData)); } } requestData.clear();}void MainWindow::set_SerialPort(){ if(!isOpen) { isOpen = true; my_serialport->setPortName(ui->PortComboBox->currentText()); //设置端口号 my_serialport->open(QIODevice::ReadWrite); //要先打开才能设置，否则出错 my_serialport->setBaudRate(ui->BaudComboBox->currentText().toInt()); //设置波特率 switch(ui->DataBitComboBox->currentIndex()) //设置数据位 { case 0: my_serialport->setDataBits(QSerialPort::Data8);break; case 1: my_serialport->setDataBits(QSerialPort::Data7);break; case 2: my_serialport->setDataBits(QSerialPort::Data6);break; } switch(ui->StopBitComboBox->currentIndex()) //设置停止位 { case 0: my_serialport->setStopBits(QSerialPort::OneStop);break; case 1: my_serialport->setStopBits(QSerialPort::TwoStop);break; } my_serialport->setParity(QSerialPort::NoParity); //校验位 my_serialport->setFlowControl(QSerialPort::NoFlowControl); //流控 ui->OpenButton->setText("关闭串口"); connect(my_serialport,SIGNAL(readyRead()),this,SLOT(my_readData())); //可以接收串口数据了 } else { isOpen = false; ui->OpenButton->setText("打开串口"); my_serialport->close(); }}void MainWindow::my_sendData(){ if(ui->HexSendCheckBox->isChecked()) { QByteArray sendData; String2Hex(ui->SendTextEdit->toPlainText(),sendData); //16进制发送 my_serialport->write(sendData); } else { my_serialport->write(ui->SendTextEdit->toPlainText().toLatin1()); }}//将一个字符串转换成字节数组void MainWindow::String2Hex(QString str, QByteArray &senddata){ int hexdata,lowhexdata; int hexdatalen = 0; int len = str.length(); //字符串长度 senddata.resize(len/2); //两个字符转成一个字节的16进制，所以先预定一个大小 char lstr,hstr; for(int i=0; i<len; ) { hstr=str[i].toLatin1(); //将每个字符都转成ASCII码 if(hstr == ' ') //判断是否为空格 { i++; continue; } i++; if(i >= len) break; lstr = str[i].toLatin1(); hexdata = ConvertHexChar(hstr); //字符转换成16进制数 lowhexdata = ConvertHexChar(lstr); if((hexdata == 16) || (lowhexdata == 16)) break; else hexdata = hexdata*16+lowhexdata; //两个字符转成一个字节的16进制数 i++; senddata[hexdatalen] = (char)hexdata; //保存到字节数组中 hexdatalen++; } senddata.resize(hexdatalen); //设置实际的字节数组大小}//将一个字符转换成16进制数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 (-1);}

上一篇：类加载机制

下一篇：C中的有符号数和无符号数之间的转换