Qt串⼝通信（QSerialPort）读取蓝⽛笔的报⽂数据
(1) 开发环境：qt5.5.1和VS2010
(2) 使⽤的时候在 pro 添加这句导⼊模块 QT += serialport
(3) //搜索串⼝，并添加到选项上供使⽤者选择
foreach(const QSerialPortInfo &Info,QSerialPortInfo ::availablePorts())
{
QSerialPort CurrentPort;
CurrentPort.setPort(Info);
if(CurrentPort.open(QIODevice::ReadWrite))
{
this->ui->BlueToothPortComboBox->addItem(CurrentPort.portName());//插⼊串⼝的名字
CurrentPort.close();  //先开再关，把串⼝名称先导⼊
}
}
(4) 连接串⼝
void MainWindow::on_pushButton_connect_clicked()
{
CurrentPort = new QSerialPort;
CurrentPort->setPortName(this->ui->BlueToothPortComboBox->currentText());//设置串⼝名
//设置波特率
switch (this->ui->BaudRateComBox->currentIndex())
{
case 0: this->ui->textEdit_show->append("Baud:115200");
CurrentPort->setBaudRate(QSerialPort::Baud115200,QSerialPort::AllDirections); break;
case 1: this->ui->textEdit_show->append("Baud:9600");
CurrentPort->setBaudRate(QSerialPort::Baud9600,QSerialPort::AllDirections); break;
default: break;
}
//设置数据位数
switch(this->ui->DateRateComBox->currentIndex())
{
case 0: this->ui->textEdit_show->append("Data:5");
CurrentPort->setDataBits(QSerialPort::Data5); break;
case 1: this->ui->textEdit_show->append("Data:6");
CurrentPort->setDataBits(QSerialPort::Data6); break;
case 2: this->ui->textEdit_show->append("Data:7");
CurrentPort->setDataBits(QSerialPort::Data7); break;
case 3: this->ui->textEdit_show->append("Data:8");
CurrentPort->setDataBits(QSerialPort::Data8); break;
default: break;
}
//设置奇偶校验
switch(this->ui->ParityComBox->currentIndex())
{
case 1:this->ui->textEdit_show->append("Parity: off");
CurrentPort->setParity(QSerialPort::NoParity); break;
default: break;
}
switch(this->ui->StopBitsComBox->currentIndex())  //设置停⽌位
{
case 0: this->ui->textEdit_show->append("StopBits:1");
CurrentPort->setStopBits(QSerialPort::OneStop); break;
case 1: this->ui->textEdit_show->append("StopBits:2");
CurrentPort->setStopBits(QSerialPort::TwoStop); break;
default: break;
}
CurrentPort->setFlowControl(QSerialPort::NoFlowControl);  //设置流控制
CurrentPort->open(QIODevice::ReadWrite);//打开串⼝
if(CurrentPort->isOpen())
{
this->ui->textEdit_show->append("Succeesfully open the Port ");
//关闭设置菜单使能
this->ui->BlueToothPortComboBox->setEnabled(false);python怎么读取串口数据
this->ui->BaudRateComBox->setEnabled(false);
this->ui->DateRateComBox->setEnabled(false);
this->ui->ParityComBox->setEnabled(false);
this->ui->StopBitsComBox->setEnabled(false);
}
else
{
this->ui->textEdit_show->append("Defeatly open the port");
}
//连接信号槽
QObject::connect(CurrentPort, &QSerialPort::readyRead, this, &MainWindow::Read_Data);    }
(5) 读取数据
void MainWindow::Read_Data()//读取接收到的数据
{
QByteArray buf;
buf = CurrentPort->readAll();//Qbytearray类提供⼀个字节数组,buf这⾥应该是缓冲数据的功能
QString str =  QString::StdString());
str = QString::fromStdString((Hex()).toStdString());
}
(6) 发送数据
void MainWindow::sendInfo(const QString &info)
{
QByteArray sendBuf;
if (ains(" "))
{
}
qDebug()<<"Write to serial: "<<info;
convertStringToHex(info, sendBuf); //把QString 转换 为 hex
CurrentPort->write(sendBuf)；这句是真正的给单⽚机发数据 ⽤到的是QIODevice::write 具体可以看⽂档
}
void MainWindow::convertStringToHex(const QString &str, QByteArray &byteData)    {
int hexdata,lowhexdata;
int hexdatalen = 0;
int len = str.length();
char lstr,hstr;
for(int i=0; i<len; )
{
//char lstr,
hstr=str[i].toLatin1();
if(hstr == ' ')
{
i++;
continue;
}
i++;
if(i >= len)
break;
lstr = str[i].toLatin1();
hexdata = convertCharToHex(hstr);
lowhexdata = convertCharToHex(lstr);
if((hexdata == 16) || (lowhexdata == 16))
break;
else
hexdata = hexdata*16+lowhexdata;
i++;
byteData[hexdatalen] = (char)hexdata;
hexdatalen++;
}
}
char MainWindow::convertCharToHex(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);
}
(7) 关闭串⼝
if (CurrentPort->isOpen())
{
CurrentPort->close();
}
delete CurrentPort;

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