我有一个 Tkinter GUI 应用程序,我需要在按钮按下时隐藏它。我不能假设应用程序会有焦点,所以我实现了 pyHook,键盘记录器样式。但是,每当我从 pyHook 启动的函数中调用withdraw() 时,窗口就会挂起,我必须强制关闭它。
为了测试,我在 GUI 内部添加了一个按钮来调用完全相同的函数,它工作得很好。这是怎么回事?'hiding' 打印了两次,所以我知道它真的挂在withdraw() 调用本身上。
下面是一个最小的完整可验证示例来说明我的意思:
from Tkinter import *
import threading
import time
try:
import pythoncom, pyHook
except ImportError:
print 'The pythoncom or pyHook modules are not installed.'
# main gui box
class TestingGUI:
def __init__(self, root):
self.root = root
self.root.title('TestingGUI')
self.button = Button(root, text="Withdraw", command=self.Hide) # works fine
self.button.grid()
def ButtonPress(self, scancode, ascii):
if scancode == 82: # kp_0
self.Hide() # hangs
def Hide(self):
print 'hiding'
self.root.withdraw()
time.sleep(2)
self.root.deiconify()
root = Tk()
TestingGUI = TestingGUI(root)
def keypressed(event):
key = chr(event.Ascii)
# have to start thread in order to return True as required by pyHook
threading.Thread(target=TestingGUI.ButtonPress, args=(event.ScanCode,key)).start()
return True
def startlogger():
obj = pyHook.HookManager()
obj.KeyDown = keypressed
obj.HookKeyboard()
pythoncom.PumpMessages()
# need this to run at the same time
logger = threading.Thread(target=startlogger)
# quits on main program exit
logger.daemon = True
logger.start()
# main gui loop
root.mainloop()