以下代码是自己测试门禁系统使用的

主要用到了串口的接收和发送

 开发环境：xp  QT5.1.1

串口：38400   N  8  1

自动检测可用串口

在xp上测试没问题

有些usb转串口会出现波特率不准的问题，CH340的usb转232使用完全正常

以下为收发的线程.h 和.cpp两个文件

最后附上转sacii显示的代码

如果要参考的话，源代码已上传：http://download.csdn.net/detail/liang890319/6463227

#ifndef MYTHREAD_H
#define MYTHREAD_H#include <QThread>
#include <stdio.h>
#include <QtGlobal>class MyThread : public QThread
{Q_OBJECT
public:QByteArray requestData;QByteArray TxData;MyThread();void setMessage(const QString &message);void setPortnum(const QString &num);void stop();void startCom();void changeTxState(bool stat);void changeRxState(bool stat);void changeComState(bool stat);signals:void request(const QString &s);void comRecive();protected:void run();private:QString messageStr;QString portnum;volatile bool com_opened;volatile bool stopped;volatile bool tx_event;volatile bool rx_event;
};#endif // MYTHREAD_H

#include "mythread.h"
#include <QtDebug>
//FOR RS232
#include <QtSerialPort/QSerialPort>
#include <QtSerialPort/QSerialPortInfo>MyThread::MyThread()
{stopped=false;}void MyThread::run()
{QSerialPort *my_serialport= new QSerialPort;while(!stopped){if(stopped&&com_opened){my_serialport->close();com_opened=false;}if(!com_opened){//open comqDebug() << "Brush:" <<"---open com port------";com_opened=true;my_serialport->setPortName(portnum);my_serialport->open(QIODevice::ReadWrite);my_serialport->setBaudRate(QSerialPort::Baud38400,QSerialPort::AllDirections);my_serialport->setDataBits(QSerialPort::Data8);my_serialport->setParity(QSerialPort::NoParity);my_serialport->setStopBits(QSerialPort::OneStop);// my_serialport->setStopBits(QSerialPort::TwoStop);my_serialport->setFlowControl(QSerialPort::NoFlowControl);com_opened=true;}if(this->com_opened&&this->tx_event){this->tx_event=false;my_serialport->clear(QSerialPort::AllDirections);qDebug() << "Brush:" <<"send data to com2"<<this->TxData.length();qDebug() << "arr size:" <<this->TxData.length();my_serialport->write(this->TxData);if (my_serialport->waitForBytesWritten(5)){qDebug() << "Brush:" <<"send data success";if (my_serialport->waitForReadyRead(1500))  //1s{requestData = my_serialport->readAll();while (my_serialport->waitForReadyRead(15))requestData += my_serialport->readAll();emit(this->comRecive());}else{qDebug() << "Brush:" <<"wait return time out";}}else{qDebug() << "Brush:" <<"send time out";}}if (my_serialport->waitForReadyRead(5))  //50ms{while (my_serialport->waitForReadyRead(5))this->msleep(20);requestData = my_serialport->readAll();emit(this->comRecive());}if(stopped&&com_opened){my_serialport->close();com_opened=false;}}
}void MyThread::stop()
{stopped=true;}
void MyThread::startCom()
{stopped=false;}
void MyThread::changeComState(bool stat){com_opened=stat;
}
void MyThread::setMessage(const QString &message)
{messageStr = message;}
void MyThread::setPortnum(const QString &num)
{portnum=num;}
void MyThread:: changeTxState(bool stat)
{tx_event=stat;
}
void MyThread:: changeRxState(bool stat)
{rx_event=stat;
}

显示部分 比如收到0xff  在text框显示 FF

void MainWindow::displayRxData()
{QString str;char tmp[100];char *buf;char var;QDateTime *datatime=new QDateTime(QDateTime::currentDateTime());if(threadA.requestData.size()>0){str="收到数据: ";str+=datatime->time().toString();ui->textEdit_rx->append(str);str.clear();buf=threadA.requestData.data();if(buf[3]==0x01) ui->textEdit_tx->append("加卡成功！");if(buf[3]==0x02) ui->textEdit_tx->append("删卡成功！");if(buf[3]==0x03) ui->textEdit_tx->append("开门成功！");if(buf[3]==0x04) ui->textEdit_tx->append("关门成功！");qDebug() << "receive num:" <<threadA.requestData.size();for(var=0;var<threadA.requestData.size();var++){::snprintf(tmp,100, "%02X", (unsigned char)(*buf));buf++;str+=QString::fromUtf8(tmp);str+=" ";}ui->textEdit_rx->append(str);}threadA.requestData.clear();
}