使用 pynput 输入退出循环

Question

我的代码的目的是非常快速地连续输入一个字母。它在按下某个键时启动（在本例中为 f3），并在按下另一个键时停止（f4）。我的代码目前看起来像这样。

from pynput.keyboard import Controller, Listener
import time

keyboard = Controller()
confirm = False


def on_press(key):
    if "f3" in str(key):
        global confirm
        confirm = True
        while confirm:
            keyboard.press('e')
            keyboard.release('e')
            time.sleep(0.10)
    elif "Key." in str(key):
        pass


def exit_loop(key):
    if "f4" in str(key):
        global confirm
        confirm = False
    elif "Key." in str(key):
        pass


with Listener(on_press=on_press) as ListenerStart:
    ListenerStart.join()

with Listener(on_press=exit_loop) as ListenerEnd:
    ListenerEnd.join()

我的问题是，当使用 f3 键启动程序时，我无法使用 f4 停止程序。此外，该程序应该暂停，而不是退出。任何帮助，将不胜感激。谢谢。

Answer 1

如果您有像 while-loop 这样长时间运行的代码，那么您必须在单独的线程中运行它 - 因为它会阻塞当前代码并且无法检查您是否按下 f4。

如果你想暂停代码，那么你应该使用一些变量 - 即。 paused = True - 控制是否应该执行或跳过 while-loop 中的代码。

然后您只需要一个Listener 来检查密钥并检查paused 是True 还是False

from pynput.keyboard import Controller, Listener
import time
import threading

def function():
    keyboard = Controller()
    
    while True:
        if not paused:
            keyboard.press('e')
            keyboard.release('e')
        time.sleep(0.1)

def on_press(key):
    global paused
    
    if paused:
        if "f3" in str(key):
            paused = False
    else:
        if "f4" in str(key):
            paused = True

# global variables with default values at star
paused  = True

# run long-running `function` in separated thread
thread = threading.Thread(target=function)  # function's name without `()`
thread.start()

with Listener(on_press=on_press) as listener:
    listener.join()

---

在正确的代码中，您可以使用相同的f3 来启动和暂停循环。

from pynput.keyboard import Controller, Listener
import time
import threading

def function():
    keyboard = Controller()
    
    while True:
        if not paused:
            keyboard.press('e')
            keyboard.release('e')
        time.sleep(0.1)

def on_press(key):
    global paused
    
    if "f3" in str(key):
        paused = not paused

# global variables with default values at star
paused = True

# run long-running `function` in separated thread
thread = threading.Thread(target=function)
thread.start()

with Listener(on_press=on_press) as listener:
    listener.join()

---

这段代码可能更复杂 - f3 可以检查 thread 是否已经存在并在它不存在时创建线程。

from pynput.keyboard import Controller, Listener
import time
import threading

def function():
    keyboard = Controller()
    
    while True:
        if not paused:
            keyboard.press('e')
            keyboard.release('e')
        time.sleep(0.1)

def on_press(key):
    global paused
    global thread
    
    if "f3" in str(key):
        paused = not paused
        if thread is None:
            # run long-running `function` in separated thread
            thread = threading.Thread(target=function)
            thread.start()
            
# global variables with default values at star
paused = True
thread = None

with Listener(on_press=on_press) as listener:
    listener.join()