使用python ctypes检测Shift键 [英] Detect shift-key presses with python ctypes

问题描述

我想检测在执行python脚本期间是否按住CTRL | SHIFT | ALT来更改其行为。所以对于ex，如果我在按住SHIFT的情况下运行脚本，我希望GUI弹出而不是命令行...等等...

I want to detect if CTRL|SHIFT|ALT are held down during the execution of a python script to alter its behavior. So for ex if i run a script with SHIFT held down i want a GUI to pop open instead of a command line... etc...

因为msvcrt.kbhit无法检测到SHIFT按键，我做了一些挖掘，发现此解决方案，这似乎很有希望。我将SHIFT添加到其热键列表中作为测试。不幸的是，如果您在dos外壳中尝试下面的代码，您会看到它可以正确检测ESC和NUMLOCK按键，但是它无法捕获SHIFT按键，而且我不知道为什么。

since msvcrt.kbhit couldn't detect SHIFT key presses i did some digging and found this solution which seemed very promising. I added SHIFT to its hotkey list as a test. Unfortunately if you try the code below in a dos shell you'll see that it correctly detects ESC and NUMLOCK key presses, but it won't catch SHIFT presses and i can't figure why that is.

任何见识将不胜感激。

import ctypes, ctypes.wintypes
import win32con

# Register hotkeys
ctypes.windll.user32.RegisterHotKey(None, 1, 0, win32con.VK_ESCAPE)
ctypes.windll.user32.RegisterHotKey(None, 1, 0, win32con.VK_NUMLOCK)
ctypes.windll.user32.RegisterHotKey(None, 1, 0, win32con.VK_LSHIFT)
ctypes.windll.user32.RegisterHotKey(None, 1, 0, win32con.VK_RSHIFT)

# Loop until one of the hotkeys are pressed
try:
    msg = ctypes.wintypes.MSG()
    while ctypes.windll.user32.GetMessageA(ctypes.byref(msg), None, 0, 0) != 0:
        if msg.message == win32con.WM_HOTKEY:
            print("KEY PRESSED!")

        ctypes.windll.user32.TranslateMessage(ctypes.byref(msg))
        ctypes.windll.user32.DispatchMessageA(ctypes.byref(msg))

# Cleanup
finally:
    ctypes.windll.user32.UnregisterHotKey(None, 1)

推荐答案

有一个名为 PyHook ，它负责与Windows输入事件有关的大多数底层细节。

There's a package named PyHook, that takes care of most low-level details related to input events on windows. It may be worth looking at.

链接到键盘挂钩文档：

• https://sourceforge.net/apps/mediawiki/pyhook/index .php？title = PyHook_Tutorial＃Keyboard_Hooks

• https://sourceforge.net/apps/mediawiki/pyhook/index.php?title=PyHook_Tutorial#Keyboard_Hooks

安装程序链接：

• http：//www.lfd。 uci.edu/~gohlke/pythonlibs/#pywin32


• http://www.lfd.uci.edu/~gohlke/pythonlibs/#pyhook

• http://www.lfd.uci.edu/~gohlke/pythonlibs/#pywin32
• http://www.lfd.uci.edu/~gohlke/pythonlibs/#pyhook

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