串行发送数据时 GUI 挂起

Question

我是python和pyqt的新手。我使用 qt 设计器创建了一个 gui。在那个 gui 中，当我单击按钮时，数据将串行发送。那次我的桂被绞死了，这是我的代码

interface.py

# -*- coding: utf-8 -*-
# Form implementation generated from reading ui file 'status.ui'
#
# Created by: PyQt4 UI code generator 4.11.4
#
# WARNING! All changes made in this file will be lost!
from PyQt4 import QtCore, QtGui
from iF_UART import *
try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
def _fromUtf8(s):
return s
try:
_encoding = QtGui.QApplication.UnicodeUTF8
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig,
_encoding)
except AttributeError:
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig)
class Ui_MainWindow(object):
def setupUi(self, MainWindow, data_queue):
self.bt = UartDriver()
self.bt.init('COM5', 115200, 0)
MainWindow.setObjectName(_fromUtf8("MainWindow"))
MainWindow.resize(800, 600)
self.centralwidget = QtGui.QWidget(MainWindow)
self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
self.pushButton = QtGui.QPushButton(self.centralwidget)
self.pushButton.setGeometry(QtCore.QRect(290, 140, 251, 91))
self.pushButton.setObjectName(_fromUtf8("pushButton"))
self.pushButton.clicked.connect(self.action_func)
self.radioButton = QtGui.QRadioButton(self.centralwidget)
self.radioButton.setGeometry(QtCore.QRect(170, 180, 82, 17))
self.radioButton.setObjectName(_fromUtf8("radioButton"))
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtGui.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 21))
self.menubar.setObjectName(_fromUtf8("menubar"))
MainWindow.setMenuBar(self.menubar)
self.statusbar = QtGui.QStatusBar(MainWindow)
self.statusbar.setObjectName(_fromUtf8("statusbar"))
MainWindow.setStatusBar(self.statusbar)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
self.data_queue = data_queue
def retranslateUi(self, MainWindow):
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow", None))
self.pushButton.setText(_translate("MainWindow", "PushButton", None))
self.radioButton.setText(_translate("MainWindow", "RadioButton", None))

def action_func(self):
send_len = self.bt.write("hai")

app.py

from PyQt4 import QtGui,QtCore
import sys
import interface
from queue import Queue
from time import sleep

qt_app = None

class Simulator(QtGui.QMainWindow, interface.Ui_MainWindow):
def __init__(self,data_queue):
super(Simulator, self).__init__()
self.setupUi(self, data_queue)
self.data_queue = data_queue
self.count = 0
self.timer = QtCore.QTimer(self)
# Function Main Start
def main():
global qt_app
qt_app = QtGui.QApplication(sys.argv)
data_queue = Queue()
form = Simulator(data_queue)
form.show()
qt_app.exec_()

if __name__ == '__main__':
main()

uart.py

import serial
import time
# time out 0.1 sec
TIME_OUT = 0.1
SER_MAX_DATA_SIZE = 1024
class UartDriver:
def __init__(self):
self.flow_control = None
self.serial_handle = None
self.handle = None
def init(self, com_port, baud_rate, flow_con=False, handle = ''):
self.flow_control = flow_con
self.handle = handle
print "Opening %s at %d" % (com_port, baud_rate)
try:
if(flow_con):
self.serial_handle = serial.Serial(com_port, baud_rate, rtscts=True)
else:
self.serial_handle = serial.Serial(com_port, baud_rate, rtscts=False, timeout=TIME_OUT)
except:
print "Could not open port"
finally:
pass
def write(self, s_data):
w_len = None
try:
if (self.serial_handle):
if(self.flow_control):
pass
else:
print "Send ",  (s_data)
w_len = self.serial_handle.write(bytearray(s_data+"n"))
print "test"
else:
print "Invalid handle"
except:
self.serial_handle.close()
finally:
return(w_len)

在 uart.py 写入发生。实际上写作没有完成，因为语句写完我只是打印了一个单词测试，但它无法在控制台上打印。有人请帮助我避免 gui 的悬而未决。

Answer 1

我自己解决了这个问题。在我的uart课上，我以一定的波特率和固定的读取超时打开了一个串行端口。在我的串行端口打开中，我添加了一个额外的参数，该参数write_timeout并且设置为零

self.serial_handle = serial.Serial(com_port, baud_rate, rtscts=False, timeout=TIME_OUT, write_timeout=0)

现在我的 GUI 工作正常。