在tkinter循环中不断访问线程

时间:2013-01-22 22:37:55

标签: tkinter serial-port updating

我正在尝试制作一个不断绘制从微处理器接收的信号的GUI。我试图通过仅使用类来实现这一点,但由于只有GUI类是oppend,因此失败了。现在我已经实现了线程(或者至少我认为我有!?)但每个线程只运行一次。这让我相信我不明白tkinter中的mainloop是如何工作的,所以我可以重新编写代码,使线程变为活动状态吗?

import Tkinter
import tkMessageBox as messagebox
from serial import *
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
from matplotlib.figure import Figure
import numpy as np
import time
import threading

go=0

x=[0.0001,0.0002,0.0003]
y=[3600,1000,2000]
stid=time.time()

root = Tkinter.Tk()
root.title("Serial gui")

class SensorThread(threading.Thread):
    def run(self):
        global run
        global x
        global y
        global stid
        print "run er ok"
        if go==1:
            print "go er ok"
            ser = Serial(5, 9600, timeout=1)
            f=ser.read(4)
            ser.close()
            x.append(time.time()-stid)
            y.append(f)


class Foo:
    def __init__(self, master):
        print "foo ok"

        frame = Tkinter.Frame(root)

        self.button_left = Tkinter.Button(frame,text="Start",
                                command=self.start)
        self.button_left.pack(side="left")

        self.button_right = Tkinter.Button(frame,text="Stop",
                                command=self.stop)
        self.button_right.pack(side="right")

        self.button_midt = Tkinter.Button(frame, text='Quit', command=self.terminate)
        self.button_midt.pack(side="bottom")

        fig = Figure()
        ax = fig.add_subplot(111, axisbg='black')

        canvas = FigureCanvasTkAgg(fig,master=master)
        canvas.show()
        canvas.get_tk_widget().pack(side='top', fill='both', expand=1)
        frame.pack()

        line1, = ax.plot(x, y, 'r-') # Returns a tuple of line objects, thus the comma
        line1.set_ydata(y)
        fig.canvas.draw()


    def start(self):
        global go
        go=1
        print go

    def stop(self):
        global go
        go=0
        print go

    def terminate(self):
        root.quit()     # stops mainloop
        root.destroy()  # this is necessary on Windows to prevent
                        # Fatal Python Error: PyEval_RestoreThread: NULL tstate

if __name__ == "__main__":
    SensorThread().run()
    Foo(root)
    root.mainloop() 

我希望你们中的一些人可以帮助我使这段代码成为一个实时更新情节的程序。

超级我在程序中更改了以下内容,

class SensorThread(threading.Thread):
def run(self):
    global run
    global x
    global y
    global stid
    #print "run er ok"
    if go==1:
        print "go er ok"
        ser = Serial(17, 9600, timeout=1)
        f=ser.read(4)
        ser.close()
        x.append(time.time()-stid)
        y.append(f)
        SensorThread().start()
    else:
        SensorThread().start()

class Foo:
....

if __name__ == "__main__":
SensorThread().start()
Foo(root)
root.mainloop() 

但它仍然没有更新plottet的数字,不应该在Foo类中这样做吗?此外,当我退出或相当python脚本时,它仍然使用50%的CPU功率可能因为传感器线程现在运行永远!?

1 个答案:

答案 0 :(得分:0)