每当有来自串行端口 python 3.x 的新数据时，从串行数据更新 tkinter 标签
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【中文标题】每当有来自串行端口 python 3.x 的新数据时，从串行数据更新 tkinter 标签【英文标题】：update tkinter label from serial data whenever there's new data from serial port python 3.x 【发布时间】：2013-07-04 06:45:00 【问题描述】：我遇到了这个问题，我无法在标签上显示任何值，每当有新数据从串行端口传入时，我想不断更新它。我是python新手，真的需要帮助。
import tkinter
import tkinter.messagebox
import serial
import time
ser = serial.Serial(
port='COM5',\
baudrate=9600,\
parity=serial.PARITY_NONE,\
stopbits=serial.STOPBITS_ONE,\
bytesize=serial.EIGHTBITS,\
timeout=4)
class Menu:
def __init__(self):
self.main_window = tkinter.Tk()
self.main_window.title("Room Light System")
self.main_window.geometry("1200x600")
#Frames
self.frame_2 = tkinter.Frame(self.main_window, bg='Orange') # Receiving DATAs
#ReceiveLabel
self.ReceiveLabel = tkinter.Label(self.frame_2,\
text = 'Received DATAs',\
bg = 'White',\
height = 2, width = 20)
#Temperature
self.GetTempLabel = tkinter.Label(self.frame_2,\
text='Temperature :')
self.TempValue = tkinter.StringVar()
self.GetTempValueLabel = tkinter.Label(self.frame_2,bg = 'Green',\
textvariable = self.TempValue
)
#PACKING!!! F2
self.frame_2.pack()
self.frame_2.place(x=410, y=0, height=300, width=400)
#ReceiveLabel
self.ReceiveLabel.pack()
self.ReceiveLabel.place(x=100, y=10)
#Temperature
self.GetTempLabel.pack()
self.GetTempLabel.place(x=50, y=80, height=20, width=120)
self.GetTempValueLabel.pack()
self.GetTempValueLabel.place(x=200, y=80, height=20, width=50)
#main loop and quit
self.quitButton = tkinter.Button(self.main_window,\
text = 'Quit',
command = self.main_window.destroy,\
height = 2, width = 6)
self.quitButton.pack()
self.quitButton.place(x=200, y=500)
tkinter.mainloop()
def GetTemp(self):
data = bytearray()
while(1):
readline = ser.read(size=10)
if len(readline) > 0 :
data = readline
v = memoryview(data)
P = v.tobytes()
P = P.decode(encoding='UTF-8')
self.TempValue.set(P)
gui = Menu()
ser.close()
【问题讨论】：
【参考方案1】：您可以在与_thread 模块分开的线程中运行您的GetTemp() 方法。使用Tkinter 方法after() 调用线程。在以下示例中，我将您的 GetTemp() 替换为生成的随机数。
import tkinter
import tkinter.messagebox
import time
import random
import _thread
class Menu:
def __init__(self):
self.main_window = tkinter.Tk()
self.main_window.title("Room Light System")
self.main_window.geometry("1200x600")
#Frames
self.frame_2 = tkinter.Frame(self.main_window, bg='Orange') # Receiving DATAs
#ReceiveLabel
self.ReceiveLabel = tkinter.Label(self.frame_2,\
text = 'Received DATAs',\
bg = 'White',\
height = 2, width = 20)
#Temperature
self.GetTempLabel = tkinter.Label(self.frame_2,\
text='Temperature :')
self.TempValue = tkinter.StringVar()
self.GetTempValueLabel = tkinter.Label(self.frame_2,bg = 'Green',\
textvariable = self.TempValue
)
#PACKING!!! F2
self.frame_2.pack()
self.frame_2.place(x=410, y=0, height=300, width=400)
#ReceiveLabel
self.ReceiveLabel.pack()
self.ReceiveLabel.place(x=100, y=10)
#Temperature
self.GetTempLabel.pack()
self.GetTempLabel.place(x=50, y=80, height=20, width=120)
self.GetTempValueLabel.pack()
self.GetTempValueLabel.place(x=200, y=80, height=20, width=50)
#main loop and quit
self.quitButton = tkinter.Button(self.main_window,\
text = 'Quit',
command = self.main_window.destroy,\
height = 2, width = 6)
self.quitButton.pack()
self.quitButton.place(x=200, y=500)
self.main_window.after(2000, _thread.start_new_thread, self.GetTemp, ())
tkinter.mainloop()
def GetTemp(self):
while(1):
value = random.random()
self.TempValue.set(str(value))
time.sleep(0.5)
gui = Menu()
【讨论】：
你好，它适用于随机生成的数字，但是当我在串口上使用它时，它仍然没有在标签上显示任何东西 我不知道你的串口模块。是pyserial.sourceforge.net 吗？我想你应该先尝试让它在没有 Tkinter 的情况下工作，然后将它应用到你的 GUI 应用程序中。【参考方案2】：在方法中调用serial..它会起作用..这是我使用Holger先生概念的serial代码.. 这段代码是用树莓派3串口ttyS0作为master和串口连接的传感器测试的.....
import tkinter
import tkinter.messagebox
import time
import _thread
import serial
class Menu:
def __init__(self):
self.main_window = tkinter.Tk()
self.main_window.title("Serial Data monitor")
self.main_window.geometry("1000x600")
#Frames
self.frame_2 = tkinter.Frame(self.main_window, bg='Orange') # Receiving DATAs
#ReceiveLabel
self.ReceiveLabel = tkinter.Label(self.frame_2,\
text = 'Received DATAs',\
bg = 'White',\
height = 2, width = 20)
#RPM
self.GetTempLabel = tkinter.Label(self.frame_2,\
text='RPM :')
self.TempValue = tkinter.StringVar()
self.GetTempValueLabel = tkinter.Label(self.frame_2,bg = 'Green',\
textvariable = self.TempValue
)
#torque
self.GetTemppLabel = tkinter.Label(self.frame_2,\
text='TORQUE :')
self.TemppValue = tkinter.StringVar()
self.GetTemppValueLabel = tkinter.Label(self.frame_2,bg = 'Green',\textvariable = self.TempValue)
PACKING!!! F2
self.frame_2.pack()
self.frame_2.place(x=410, y=0, height=300, width=400)
#ReceiveLabel
self.ReceiveLabel.pack()
self.ReceiveLabel.place(x=100, y=10)
#rpm
self.GetTempLabel.pack()
self.GetTempLabel.place(x=50, y=80, height=20, width=80)
self.GetTempValueLabel.pack()
self.GetTempValueLabel.place(x=200, y=80, height=20, width=120)
#torque
self.GetTemppLabel.pack()
self.GetTemppLabel.place(x=50, y=120, height=20, width=80)
self.GetTemppValueLabel.pack()
self.GetTemppValueLabel.place(x=200, y=120, height=20, width=120)
#main loop and quit
self.quitButton = tkinter.Button(self.main_window,\
text = 'Quit',
command = self.main_window.destroy,\
height = 2, width = 6)
self.quitButton.pack()
self.quitButton.place(x=200, y=500)
self.main_window.after(2000, _thread.start_new_thread, self.GetTemp, ())
self.main_window.after(4000, _thread.start_new_thread, self.GetTempp, ())
tkinter.mainloop()
def GetTemp(self):
s=serial.Serial(port='/dev/ttyS0',baudrate=9600)
string='*00T%'
while True:
s.write(str.encode(string))
print(string)
time.sleep(2)
if s.inWaiting():
temp=s.readline(s.inWaiting())
value=temp.decode('utf-8')
value=value[5:-1]
def GetTempp(self):
s=serial.Serial(port='/dev/ttyS0',baudrate=9600)
string1='*01T%'
while True:
s.write(str.encode(string1))
print(string1)
time.sleep(2)
if s.inWaiting():
tempp=s.readline(s.inWaiting())
value1=tempp.decode('utf-8')
value1=value1[5:-1]
print(value1)
self.TemppValue.set(str(value1))
time.sleep(0.5)
gui = Menu()
【讨论】：
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