Python 与 Tkinter 按钮的串行连接

Question

我正在尝试为串行项目制作 GUI，我需要能够 select 通信端口和使用通信端口的运行命令。

这是我想要的 GUI 示例，采用 table 形式。

Start Connection | Dropdown of Comm Numbers | Button to run commands

我有一些我一直在研究的代码，但这让我很困惑。

from tkinter import *
from tkinter.ttk import *
import tkinter as tk
import serial
import ctypes
from functools import partial

def connect(ser):    #button that starts a connection, ser
    try:
        port = D.get()    #snags the number in the dropdown
        print(D.get())
        ser = serial.Serial(
                        port = "COM" +str(port),
                        baudrate=9600,
                    )
        print(ser.port)
    except:
        ctypes.windll.user32.MessageBoxW(0, "Fail", title, 0)
        ser.close()
    return ser

def running(ser):    #button that runs a ton of commands through ser
    P['value']=0
    ser.write(b'lottsacommands')
    P['value']=100
    root.update_idletasks()

root = tk.Tk()
bottomframe = Frame(root)    #frame for bottom of root window
bottomframe.pack(side=tk.BOTTOM)

D = StringVar(bottomframe)
P = Progressbar(bottomframe,orient=HORIZONTAL,length=100,mode='determinate')  #build a progress bar in the window 'P'
B = tk.Button(bottomframe,text='Begin Run In',command=partial(running, ser))     #build the button 'B'
B2 = tk.Button(bottomframe,text="Connect To Serial",command=partial(connect, ser))
T2 = tk.Text(bottomframe, height=1, width=7)    #box that says comm

P.pack()    #pack progress bar
B.pack(side=tk.RIGHT)       #formats the button
B2.pack(side=tk.LEFT)
T2.pack(side=tk.LEFT)       #format the ports dropdown

ports = {1,2,3,4,5,6,7,8,9}
DR = OptionMenu(bottomframe, D, *choices)   #creates the dropdown
DR.pack()

T2.insert(tk.END, 'COMM')    #makes the box say comm
tk.mainloop()    #runs the loop

我似乎无法将连接函数中的 comm 端口连接转移到第二个执行函数。感谢您的帮助！

Answer 1

原来问题是我没有全局定义ser。我更改了 connect 函数，使其创建的 ser 不再是该函数的本地而是全局的，覆盖了 ser 初始化的 1。

def connect(ser):    #button that starts a connection, ser
    try:
        global ser        #makes ser a global variable accessible to other functions
        port = D.get()    #snags the number in the dropdown
        print(D.get())
        ser = serial.Serial(
                        port = "COM" +str(port),
                        baudrate=9600,
                    )
        print(ser.port)
    except:
        ctypes.windll.user32.MessageBoxW(0, "Fail", title, 0)
        ser.close()
    return ser

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