python-2.7 - 将参数传递给 Pynput 监听器

Question

我使用 pynput 监听器来捕获键盘上的按键，但问题是我需要将参数传递给 on_press 和 on_release 函数，但我不知道该怎么做。
您可以在代码中看到，我需要传递客户端套接字，以便向他发送按下/释放的键。

def handle_keyboard_events(self, client_socket):
    keyboard_listener = keyboard.Listener(on_press=self.on_key_press, on_release=self.on_key_release)
    keyboard_listener.start()

def on_key_press(self, key):
    key_press_command = KeyPress(key)
    self.send_message(key_press_command, True, client_socket)

def on_key_release(self, key):
    key_release_command = KeyRelease(key)
    self.send_message(key_release_command, True, client_socket)

Answer 1

我看到你正在使用 self所以你在一个 class 里面.
为什么不用self.client_socket = client_socket在你的构造函数中？

# update your constructor with self.client_socket
def __init__(client_socket, **other_args_of_yours):
    
    # use this object variable when you activate key listener
    self.client_socket = client_socket

或添加 self.client_socket = client_socket在 handle_keyboard_events()方法:

def handle_keyboard_events(self, client_socket):
    
    self.client_socket = client_socket # <----- update
    
    keyboard_listener = keyboard.Listener(
        on_press=self.on_key_press, 
        on_release=self.on_key_release
    )
    keyboard_listener.start()

并使用 self.client_socket在 press和 release方法

def on_key_press(self, key):
    key_press_command = KeyPress(key)
    self.send_message(key_press_command, True, self.client_socket) # <--- update

def on_key_release(self, key):
    key_release_command = KeyRelease(key)
    self.send_message(key_release_command, True, self.client_socket) # <--- update

或者
如果你真的想通过client_socket给您的 press和 release方法，你可以试试这个:

def handle_keyboard_events(self, client_socket):
    # use lambda to pass the client socket
    # with this method, after you get the `key` you can pass additional params to on_press and on_release
    keyboard_listener = keyboard.Listener(
        on_press=lambda key: self.on_key_press(key, client_socket), # <--- client socket passed
        on_release=lambda key: self.on_key_release(key, client_socket) # <--- client socket passed
    )
    keyboard_listener.start()

# add client socket as new arg
def on_key_press(self, key, client_socket):
    key_press_command = KeyPress(key)
    self.send_message(key_press_command, True, client_socket) # from params
    
# add client socket as new arg
def on_key_release(self, key, client_socket):
    key_release_command = KeyRelease(key)
    self.send_message(key_release_command, True, client_socket) # from params

你准备好了。