在Ubuntu系统下使用QSerialPort时遇到“device not open”错误,通常是由于以下几个原因造成的。下面我将根据提示逐一分析并提供可能的解决方案: 确认QSerialPort对象是否已经正确初始化并打开: 在使用QSerialPort之前,需要确保已经正确地创建并初始化了该对象,然后调用open方法来打开串口。以下是一个简单的示例代码: cp...
QSerialPort::NoError:没有错误。QSerialPort::DeviceNotFoundError:找不到设备。QSerialPort::PermissionError:没有足够的权限。QSerialPort::OpenError:打开设备时出错。QSerialPort::ParityError:奇偶校验错误。QSerialPort::FramingError:帧错误。QSerialPort::BreakConditionError:断线条件错误。QSerialPort::WriteE...
port->setFlowControl(QSerialPort::NoFlowControl); //无控制 bool flag=port->open(QIODevice::ReadWrite); //读写打开 if(flag) { qDebug()<<"port->open(QIODevice::ReadWrite)"; qDebug("serial is open"); port->setBaudRate(QSerialPort::Baud115200); //波特率 port->setDataBits(QSerial...
QIODevice::write (QSerialPort): device not open问题怎么解决 只看楼主 收藏 回复 windy浅浅浅 初涉江湖 1 伊布小队长 武林高手 9 先开串口,再写数据…… 舍我其谁领军 初涉江湖 1 我也遇到一样的问题:写数据下不下去!!! 御坂26号 人中龙凤 11 if(serialport.open(Qt::ReadWrite)){...}...
LOCK_MUTEX();if(mode ==QIODevice::NotOpen)returnisOpen();if(!isOpen()) {/*open the port*/Win_Handle=CreateFileA(port.toAscii(), GENERIC_READ|GENERIC_WRITE, FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, dwFlagsAndAttributes, NULL);if(Win_Handle!=INVALID_HANDLE_VALUE) { ...
port.open(QIODevice); port.setBaudRate(); port.setDataBits(); port.setFlowControl(); port.setParity(); port.setStopBits(); 关闭串口 [virtual] void QIODevice::close() First emits aboutToClose(), then closes the device and sets its OpenMode to NotOpen. The error string is also rese...
QSerialPort::OpenError3An error occurred while attempting to open an already opened device in this object. QSerialPort::NotOpenError10This error occurs when an operation is executed that can only be successfully performed if the device is open. This value was introduced inQtSerialPort5.2. ...
if not serial.open(QIODevice.ReadOnly): print(f"Failed to open serial port {serial.portName()}") sys.exit(-1) # 连接readyRead信号和槽函数 serial.readyRead.connect(readSerialData) sys.exit(app.exec_()) ``` 上述代码创建了一个QSerialPort对象serial,并设置了串口名字和波特率。然后后,通过调...
(QSerialPort::Data8); m_serial->setParity(QSerialPort::NoParity); m_serial->setStopBits(QSerialPort::OneStop); m_serial->setFlowControl(QSerialPort::NoFlowControl); if (m_serial->open(QIODevice::ReadWrite)) { m_statusLabel->setText(tr("Connected to %1 : %2, %3, %4, %5,...
open(QIODevice::ReadWrite)){ qDebug() << "opened"; }else{ qDebug() << "Not opened"; } qDebug() << serial.errorString(); serial.write("M114 \n"); qDebug() << serial.readAll(); serial.close(); } MainWindow w; w.show(); return a.exec(); } 正如您所看到的,我正在尝试...