我有一个带有两个类的简单程序,一个通过serial.serial连接控制一个继电器板。另一个类用于GUI,它将命令发送到继电器类,然后显示继电器板的状态。
我遇到了从中继类向tkinter类发送消息的问题。只有在relay命令完成后才会显示消息。我已经减少了下面的程序。 Test.test()表示我的中继类中的一个函数,其中MainWindow类是我的GUI。
Someone已指出使用threading来处理类之间传递的消息。这是我唯一的选择吗?我还没有钻研过线程。
from Tkinter import *
import time
import ScrolledText
class Test():
def test(self):
main.textboxupdate(" test start ")
time.sleep(2)
main.textboxupdate(" test middle ")
time.sleep(2)
main.textboxupdate(" test end ")
class MainWindow(Frame):
def __init__(self, *args, **kwargs):
Frame.__init__(self, *args, **kwargs)
self.canvas = Canvas(width=1200,height=700)
self.canvas.pack(expand=YES,fill=BOTH)
self.frame = Frame(self.canvas)
self.TextBox = ScrolledText.ScrolledText(self.frame)
self.open = Button(self.frame, text="Open Cover",
command=test.test)
def createtextbox(self, statusmsg):
self.frame.place(x=0,y=0)
self.TextBox.config(state = NORMAL)
self.TextBox.insert(END, statusmsg,('error'))
self.TextBox.config(state = 'disabled', height = 2, width = 35)
self.TextBox.see(END)
self.TextBox.grid(columnspan=2, rowspan = 1)
self.open.grid()
def textboxupdate(self, statusmsg):
statusmsg = statusmsg +'\n'
self.TextBox.config(state = NORMAL)
self.TextBox.insert(END, statusmsg,('error'))
self.TextBox.config(state = 'disabled', height = 10, width = 50)
self.TextBox.see(END)
test = Test()
root = Tk()
main = MainWindow(root)
main.createtextbox('Startup\n')
root.mainloop()
答案 0 :(得分:0)
这是一个选项:
from Tkinter import *
import time
import ScrolledText
import threading, Queue
class Test():
def __init__(self):
self.msg_queue = Queue.Queue()
def test(self):
self.msg_queue.put(" test start ")
time.sleep(2)
self.msg_queue.put(" test middle ")
time.sleep(2)
self.msg_queue.put(" test end ")
class MainWindow(Frame):
def __init__(self, *args, **kwargs):
Frame.__init__(self, *args, **kwargs)
self.canvas = Canvas(width=1200,height=700)
self.canvas.pack(expand=YES,fill=BOTH)
self.frame = Frame(self.canvas)
self.TextBox = ScrolledText.ScrolledText(self.frame)
self.open = Button(self.frame, text="Open Cover",
command=self.create_thread)
self.test_thread = None
self.createtextbox("")
def create_thread(self):
self.test_thread = threading.Thread(target=test.test)
self.test_thread.start()
self.after(10, self.update_textbox)
def update_textbox(self):
while not test.msg_queue.empty():
self.textboxupdate(test.msg_queue.get())
if self.test_thread.is_alive():
self.after(10, self.update_textbox)
else:
self.test_thread = None
def createtextbox(self, statusmsg):
self.frame.place(x=0,y=0)
self.TextBox.config(state = NORMAL)
self.TextBox.insert(END, statusmsg,('error'))
self.TextBox.config(state = 'disabled', height = 2, width = 35)
self.TextBox.see(END)
self.TextBox.grid(columnspan=2, rowspan = 1)
self.open.grid()
def textboxupdate(self, statusmsg):
statusmsg = statusmsg +'\n'
self.TextBox.config(state = NORMAL)
self.TextBox.insert(END, statusmsg,('error'))
self.TextBox.config(state = 'disabled', height = 10, width = 50)
self.TextBox.see(END)
self.update_idletasks()
test = Test()
main = MainWindow()
main.pack()
main.mainloop()
第一个更改是,Test.test
不是调用函数,而是将消息放入队列。 Test.test
在单独的帖子中MainWindow.start_thread
启动MainWindow.start_thread
。 update_textbox
还通过要求tkinter在10毫秒(self.after(10, self.update_textbox)
)之后调用MainWindow
来安排对线程的检查。此函数将所有新消息从队列中删除,并显示它们。然后,如果线程仍在运行,它会自行重新安排,否则会重置{{1}}。