Python 从PyQt GUI连接到串行
我写了一个程序来发送和接收串行数据，但我有一个问题，我想创建一个函数“connect（）”或一个类，当我按下一个按钮时，该函数被执行，但是如果我在“MainWindow”类中创建这个函数，来自“TestThread”类的变量“ser”将无法初始化，你能帮助我吗Python 从PyQt GUI连接到串行,python,python-3.x,pyqt5,pyserial,Python,Python 3.x,Pyqt5,Pyserial,我写了一个程序来发送和接收串行数据，但我有一个问题，我想创建一个函数“connect（）”或一个类，当我按下一个按钮时，该函数被执行，但是如果我在“MainWindow”类中创建这个函数，来自“TestThread”类的变量“ser”将无法初始化，你能帮助我吗 import sys import serial from PyQt5.QtWidgets import QMainWindow, QApplication from PyQt5.QtCore import QThread, pyqt
import sys
import serial
from PyQt5.QtWidgets import QMainWindow, QApplication
from PyQt5.QtCore import QThread, pyqtSignal
from PyQt5.uic import loadUi
ser = serial.Serial('/dev/tty.usbmodem14201', 9600, timeout=1)
class TestThread(QThread):
serialUpdate = pyqtSignal(str)
def run(self):
while ser.is_open:
QThread.sleep(1)
value = ser.readline().decode('ascii')
self.serialUpdate.emit(value)
ser.flush()
class MainWindow(QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
loadUi('/Users/bogdanvesa/P2A_GUI/mainwindow.ui', self)
self.thread = TestThread(self)
self.thread.serialUpdate.connect(self.handleSerialUpdate)
self.connect_btn.clicked.connect(self.connectSer)
self.lcd_EBtn.clicked.connect(self.startThread)
def startThread(self):
self.thread.start()
def handleSerialUpdate(self, value):
print(value)
self.lcd_lineEdit.setText(value)
def main():
app = QApplication(sys.argv)
form = MainWindow()
form.show()
sys.exit(app.exec_())
if __name__ == "__main__":
main()
与其使用pySerial+线程，不如使用与Qt事件循环共存的
QSerialPortfrom PyQt5 import QtCore, QtWidgets, QtSerialPort
class 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().decode()
text = text.rstrip('\r\n')
self.output_te.append(text)
@QtCore.pyqtSlot()
def send(self):
self.serial.write(self.message_le.text().encode())
@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_())
我使用了上面重新设计的代码，因此它有一个
主窗口菜单栏状态栏import sys
from PyQt5 import QtCore, QtWidgets, QtSerialPort
from PyQt5.QtWidgets import QApplication, QMainWindow ,QWidget ,QToolBar ,QHBoxLayout, QAction ,QStatusBar ,QLineEdit ,QPushButton ,QTextEdit , QVBoxLayout
from PyQt5.QtCore import Qt , pyqtSignal
from PyQt5.QtSerialPort import QSerialPortInfo
class AddComport(QMainWindow):
porttnavn = pyqtSignal(str)
def __init__(self, parent , menu):
super().__init__(parent)
menuComporte = menu.addMenu("Comporte")
info_list = QSerialPortInfo()
serial_list = info_list.availablePorts()
serial_ports = [port.portName() for port in serial_list]
if(len(serial_ports)> 0):
antalporte = len(serial_ports)
antal = 0
while antal < antalporte:
button_action = QAction(serial_ports[antal], self)
txt = serial_ports[antal]
portinfo = QSerialPortInfo(txt)
buttoninfotxt = " Ingen informationer"
if portinfo.hasProductIdentifier():
buttoninfotxt = ("Produkt specifikation = " + str(portinfo.vendorIdentifier()))
if portinfo.hasVendorIdentifier():
buttoninfotxt = buttoninfotxt + (" Fremstillers id = "+ str(portinfo.productIdentifier()))
button_action = QAction( txt , self)
button_action.setStatusTip( buttoninfotxt)
button_action.triggered.connect(lambda checked, txt = txt: self.valgAfComportClick(txt))
menuComporte.addAction(button_action)
antal = antal +1
else:
Print("Ingen com porte fundet")
def valgAfComportClick(self , port):
self.porttnavn.emit(port)
def closeEvent(self, event):
selv.close()
class MainWindow(QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
portname = "None"
self.setStatusBar(QStatusBar(self))
menu = self.menuBar()
comfinder = AddComport(self , menu)
comfinder.porttnavn.connect(self.valgAfComport)
self.setWindowTitle("Serial port display / send")
self.message_le = QLineEdit()
self.send_btn = QPushButton(
text="Send",
clicked=self.send
)
self.output_te = QTextEdit(readOnly=True)
self.button = QPushButton(
text="Connect",
checkable=True,
toggled=self.on_toggled
)
lay = QVBoxLayout(self)
hlay = QHBoxLayout()
hlay.addWidget(self.message_le)
hlay.addWidget(self.send_btn)
lay.addLayout(hlay)
lay.addWidget(self.output_te)
lay.addWidget(self.button)
widget = QWidget()
widget.setLayout(lay)
self.setCentralWidget(widget)
self.serial = QtSerialPort.QSerialPort(
portname,
baudRate=QtSerialPort.QSerialPort.Baud9600,
readyRead=self.receive)
@QtCore.pyqtSlot()
def receive(self):
while self.serial.canReadLine():
text = self.serial.readLine().data().decode()
text = text.rstrip('\r\n')
self.output_te.append(text)
@QtCore.pyqtSlot()
def send(self):
self.serial.write(self.message_le.text().encode())
@QtCore.pyqtSlot(bool)
def on_toggled(self, checked):
self.button.setText("Disconnect" if checked else "Connect")
if checked:
if not self.serial.isOpen():
self.serial.open(QtCore.QIODevice.ReadWrite)
if not self.serial.isOpen():
self.button.setChecked(False)
else:
self.button.setChecked(False)
else:
self.serial.close()
def valgAfComport(self , nyport):
seropen = False
if self.serial.isOpen():
seropen = True
self.serial.close()
self.serial.setPortName(nyport)
if seropen:
self.serial.open(QtCore.QIODevice.ReadWrite)
if not self.serial.isOpen():
self.button.setChecked(False)
print(nyport)
def closeEvent(self, event):
self.serial.close()
print("Comport lukket")
print(comporttxt)
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
w = MainWindow()
w.show()
sys.exit(app.exec_())
解释你自己better@eyllanesc好的，当我按下一个按钮时，我想连接到Arduino（打开串行），当我按下另一个按钮时关闭连接（关闭串行），但我不知道如何实现这一点非常感谢，我将使用您的代码，但为了我的和平，可以从“主窗口”的按钮连接到串行上课？同时，我的“TestThread”类运行良好。。你能给我举个例子吗？