Tkinter + RFID，只在读取RFID标签时显示图像

Question

我必须编写一个程序，当RFID标签位于RFID读取器上时显示图像，并在RFID标签从RFID读取器中移除时删除图像。

下面的代码可以在读取tag或tag 2时显示图像，但继续显示它们。

from Tkinter import *
import serial
import time

one = '0419AC8E70'
two = '0419ACB481'

ser = serial.Serial('/dev/ttyUSB0', 2400)

reader = ser.read(11)


root = Tk()
frame = Frame(root)
frame.pack()


photo = PhotoImage(file="/home/daniel/Desktop/BY/test3.gif")
photo2 = PhotoImage(file="/home/daniel/Desktop/BY/test2.gif")
firstimage = Label(frame, image=photo)
secondimage = Label(frame, image=photo2)

def set_image():
    if one in reader:    
        print("1")
        ser.flush()
        time.sleep(1)       
        firstimage.pack( fill = BOTH)   
    else:
        firstimage.pack_forget()
    if two in reader:    
        print("1")
        secondimage.pack( fill = BOTH)  
        ser.flush()
        time.sleep(1)   
    else:
        secondimage.pack_forget()

    firstimage.after(200,set_image) #to run set_image function at regular intervals


set_image()
root.mainloop()

让我困扰的是Tkinter gui中的root.mainloop()函数。如何使程序在读取相应标签时只显示图像，而在读取非标签时不显示任何内容？

Answer 1

让我们从这个开始。

from Tkinter import *
import serial
import time

one = '0419AC8E70'
two = '0419ACB481'

ser = serial.Serial('/dev/ttyUSB0', 2400)

reader = ser.read(11)


root = Tk()
frame = Frame(root)
frame.pack()


#photo = PhotoImage(file="/home/daniel/Desktop/BY/test3.gif")
#photo2 = PhotoImage(file="/home/daniel/Desktop/BY/test2.gif")
firstimage = Label(frame)
firstimage.pack()
secondimage = Label(frame)
secondimage.pack()

def set_image():
    ser = serial.Serial('/dev/ttyUSB0', 2400)
    reader = ser.read(11)
    if one in reader:    
        firstimage.config(text="One in reader")  
    elif two in reader:    
        secondimage.config(text="Two in reader")  
    else:
        firstimage.config(text="One not in reader")
        secondimage.config(text="Two not in reader")

    firstimage.after(2000,set_image)
    secondimage.after(2000,set_image)

set_image()
root.mainloop()