如何在python中将串行数据打印到标签中？

Question

在我的代码中，我想要接收到串行数据到data并想打印到标签。并想通过按钮和选择器发送/关闭命令。除了将data打印到标签中之外，一切都可以。下一步会是什么？

import serial 
import Tkinter 
from Tkinter import * 
win = Tk() 
ser = serial.Serial('com8',9600) 
def bt1(): ser.write('on') 
def bt2(): ser.write('off') 
def bt3(): ser.write(v.get()) 

def makewindow(): 
    global v,d 
    frame1 = Frame(win) 
    frame1.pack(side = LEFT) 
    b1 = Button(frame1, text = "ON", command = bt1) 
    b2 = Button(frame1, text = "OFF", command = bt2) 
    b1.grid(row = 0, column = 0) 
    b2.grid(row = 0, column = 1) 

    frame2 = Frame(win) 
    frame2.pack() 
    v = StringVar() 
    r1 = Radiobutton(frame2,text = 'on', variable = v, value = 'on') 
    r2 = Radiobutton(frame2,text = 'off', variable = v, value = 'off') 
    r1.select() 
    b3 = Button(frame2, text = 'send', command = bt4) 
    b3.pack(sid = RIGHT, padx = 5) 
    r1.pack(side = LEFT) 
    r2.pack(side = LEFT) 

    frame3 = Frame(win) 
    frame3.pack() 
    d = StringVar() 
    d.set('default') 
    label = Label(frame3, textvariable = d, relief = RAISED) 
    label.pack(side = RIGHT) 
    return win 

def update(): 
    data = ser.readline(ser.inWaiting()) 
    win.after(100,update) 


update() 
win = makewindow() 
win.mainloop() 

Answer 1

您可以使用label["text"]来设置/获取Tkinter标签的内容。

使用此片段：

def update(): 
    global d 
    data = ser.readline(ser.inWaiting()) 
    d.set(data) 

请不要使用全局变量。他们是非常糟糕的做法。相反，你应该把你的程序包装成一个类：

import serial 
import Tkinter 
from Tkinter import * 
class SerialViewer: 
    def __init__(self): 
     self.win = Tk() 
     self.ser = serial.Serial('com8',9600) 

    def bt1 (self): 
     self.ser.write('on') 

    def bt2 (self): 
     self.ser.write('off') 

    def bt3 (self): 
     self.ser.write(self.v.get()) 

    def makewindow (self): 
     frame1 = Frame(self.win) 
     frame1.pack(side = LEFT) 
     b1 = Button(frame1, text = "ON", command = self.bt1) 
     b2 = Button(frame1, text = "OFF", command = self.bt2) 
     b1.grid(row = 0, column = 0) 
     b2.grid(row = 0, column = 1) 

     frame2 = Frame(self.win) 
     frame2.pack() 
     self.v = StringVar() 
     r1 = Radiobutton(frame2,text = 'on', variable = self.v, value = 'on') 
     r2 = Radiobutton(frame2,text = 'off', variable = self.v, value = 'off') 
     r1.select() 
     b3 = Button(frame2, text = 'send', command = self.bt4) 
     b3.pack(sid = RIGHT, padx = 5) 
     r1.pack(side = LEFT) 
     r2.pack(side = LEFT) 

     frame3 = Frame(self.win) 
     frame3.pack() 
     self.d = StringVar() 
     self.d.set('default') 
     label = Label(frame3, textvariable = self.d, relief = RAISED) 
     label.pack(side = RIGHT) 

    def update(self): 
     data = self.ser.readline(self.ser.inWaiting()) 
     self.d.set(data) 
     self.win.after(100,self.update) 

    def run(self): 
     self.makewindow() 
     self.update() 
     self.win.mainloop() 

SerialViewer().run() 

尽管我无法测试它，但现在应该工作。但是bt4（）在哪里定义？