与其使用pySerial +线程，不如使用
QSerialPort它与Qt事件循环一起使用：
from PyQt5 import QtCore, QtWidgets, QtSerialPortclass Widget(QtWidgets.QWidget): def __init__(self, parent=None): super(Widget, self).__init__(parent) self.message_le = QtWidgets.QLineEdit() self.send_btn = QtWidgets.QPushButton( text="Send", clicked=self.send ) self.output_te = QtWidgets.QTextEdit(readonly=True) self.button = QtWidgets.QPushButton( text="Connect", checkable=True, toggled=self.on_toggled ) lay = QtWidgets.QVBoxLayout(self) hlay = QtWidgets.QHBoxLayout() hlay.addWidget(self.message_le) hlay.addWidget(self.send_btn) lay.addLayout(hlay) lay.addWidget(self.output_te) lay.addWidget(self.button) self.serial = QtSerialPort.QSerialPort( '/dev/tty.usbmodem14201', baudRate=QtSerialPort.QSerialPort.Baud9600, readyRead=self.receive ) @QtCore.pyqtSlot() def receive(self): while self.serial.canReadLine(): text = self.serial.readLine().data().depre() text = text.rstrip('rn') self.output_te.append(text) @QtCore.pyqtSlot() def send(self): self.serial.write(self.message_le.text().enpre()) @QtCore.pyqtSlot(bool) def on_toggled(self, checked): self.button.setText("Disconnect" if checked else "Connect") if checked: if not self.serial.isOpen(): if not self.serial.open(QtCore.QIODevice.ReadWrite): self.button.setChecked(False) else: self.serial.close()if __name__ == '__main__': import sys app = QtWidgets.QApplication(sys.argv) w = Widget() w.show() sys.exit(app.exec_())
