在cmd窗口中检测键盘按下

Question

当我在cmd窗口中运行ROS2节点时，我试图检测键盘按压。

我已经用pynput写了这个，但是它检测到所有按下的键，即使我在另一个窗口。

import sys

import os
import signal
import time
    
from pynput import keyboard

import rclpy
from rclpy.parameter import Parameter
import std_msgs.msg


class KeystrokeListen:
    def __init__(self, name=None):
        self.node = rclpy.create_node(name or type(self).__name__)
        self.pub_glyph = self.node.create_publisher(std_msgs.msg.String, 'glyphkey_pressed', 10)
        self.pub_code = self.node.create_publisher(std_msgs.msg.UInt32, 'key_pressed', 10)

    def spin(self):
            with keyboard.Listener(on_press=self.on_press, on_release=self.on_release) as listener:
                while rclpy.ok() and listener.running:
                    rclpy.spin_once(self.node, timeout_sec=0.1)

    @property
    def logger(self):
        return self.node.get_logger()


    def on_release(self, key):
        pass


    def on_press(self, key): 
        try:
            char = getattr(key, 'char', None)
            if isinstance(char, str):
                self.logger.info('pressed ' + char)
                self.pub_glyph.publish(self.pub_glyph.msg_type(data=char))
            else:
                try:
                    # known keys like spacebar, ctrl
                    name = key.name
                    vk = key.value.vk
                except AttributeError:
                    # unknown keys like headphones skip song button
                    name = 'UNKNOWN'
                    vk = key.vk
                self.logger.info('pressed {} ({})'.format(name, vk))
                # todo: These values are not cross-platform. When ROS2 supports Enums, use them instead
                self.pub_code.publish(self.pub_code.msg_type(data=vk))
        except Exception as e:
            self.logger.error(str(e))
            raise

        if key == keyboard.Key.esc:
            self.logger.info('stopping listener')
            raise keyboard.Listener.StopException            
            os.kill(os.getpid(), signal.SIGINT)


def main(args=None):
    rclpy.init(args=args)
    KeystrokeListen().spin()


if __name__ == '__main__':
    main()

我在这里发现了一些与How to detect key presses?相关的内容，比如获取当前窗口的名称，然后是希望检测到按键的窗口的名称：

from win32gui import GetWindowText, GetForegroundWindow
current_window = (GetWindowText(GetForegroundWindow()))
desired_window_name = "Stopwatch"

然而，我只想让我的程序工作，无论何时我在cmd，我启动它。

知道吗？？

提前谢谢你！

Answer 1

实际上，这个模块可能会帮助您解决问题。下面是我如何做到这一点的一个例子：

from win32gui import GetForegroundWindow, GetWindowText

if all(win_name in GetWindowText(GetForegroundWindow()) for win_name in ["cmd.exe", __file__]):
    print("this program's cmd is focused!")