使用 Python Evdev 的多个游戏手柄？

Question

我找到了一种在 Python 中使用游戏手柄的方法，使用模块 Evdev（见最后的链接）。 在本教程中，作者只使用了一个游戏手柄，但他也指出，应该可以使用基于以下代码的多个游戏手柄：

from evdev import InputDevice
from select import select
gamepad = InputDevice('/dev/input/event0')
while True:
    r,w,x = select([gamepad], [], [])
    for event in gamepad.read():
        print(event)

Select.select 似乎一直等到一个按钮被按下，这样程序就会被中断，直到发生这种情况。 如何修改代码以使用多个游戏手柄或在等待按钮输入时执行其他代码？ 或者有没有更好的替代方法来使用 evdev 呢？

http://ericgoebelbecker.com/2015/06/raspberry-pi-and-gamepad-programming-part-1-reading-the-device/

Answer 1

如何修改代码以使用多个游戏手柄或在等待按钮输入时执行其他代码？

查看InputDevice.read的文档

read()
从设备读取多个输入事件。 返回一个生成InputEvent实例的生成器对象。 如果目前没有可用的事件，则引发BlockingIOError 。

Select 将阻塞，直到输入事件可用。 相反，我们可以读取事件直到我们得到 BlockingIOError。 然后继续下一个游戏手柄，或者做任何其他需要在主循环中完成的工作。

你也可以考虑使用InputDevice.read_one

read_one()
读取并返回单个输入事件作为InputEvent的实例。

如果没有挂起的输入事件，则返回None 。

Answer 2

我也有这个需求（我有两个 BT 游戏手柄）。 所以，我写了我的代码：

• 创建一个线程（ threading.Thread() ），每秒检查它们是否连接到预设的事件路径/dev/input/event* （16 和 20 是默认值，可以更改）。 如果没有找到它们，它会尝试下一个事件（例如：17/21）。 如果它找到一个或两个，它就会连接它/它们。 如果没有，它会每秒检查一次。
• 为了连接多个游戏手柄，它使用selector作为文档说。

你可以在这里看到我的代码，但我建议你去我的Github上更新。

#!/usr/bin/env python3 import time, argparse, subprocess try: from obs_api import client, consola, c2, c3, c, thread except: from obs_api_no_obs import client, consola, c2, c3, c, thread import sys from evdev import InputDevice, ecodes from selectors import DefaultSelector, EVENT_READ class Bt: def __init__(self): self.but = [307, 308, 305, 304, 315] self.gamepad1, self.gamepad2 = None, None self.selector = DefaultSelector() self.devices_list = list() self.devices_dict = dict() self.bt_on = True def bt_send_hat(self, path, que, val): client.send_message('/bt', [int(path[-2:]), que, val]) c2(f'/bt, {int(path[-2:])}, {que}, {val}') if val == 0: self.devices_dict[path] = 'c' else: self.devices_dict[path] = que def bt_send(self, path, que, val): client.send_message('/bt', [int(path[-2:]), que, val]) c2(f'/bt, {int(path[-2:])}, {que}, {val}') def reconnect(self): device1 = '13:57:90:05:0E:31' device2 = '13:6E:0E:07:0E:31' ps1 = subprocess.Popen(['bluetoothctl', 'info', device1], stdout=subprocess.PIPE) ps2 = subprocess.Popen(['bluetoothctl', 'info', device2], stdout=subprocess.PIPE) stdout1 = subprocess.check_output(['grep', 'Connected'], stdin=ps1.stdout).decode("utf-8") stdout2 = subprocess.check_output(['grep', 'Connected'], stdin=ps2.stdout).decode("utf-8") if 'No' in stdout1 or 'no' in stdout1: subprocess.Popen(['bluetoothctl', 'connect', device1]) c3(f'bluetoothctl connect {device1}') if 'No' in stdout2 or 'no' in stdout2: subprocess.Popen(['bluetoothctl', 'connect', device2]) c3(f'bluetoothctl connect {device2}') def is_none(self, num, dev): gamepad = f'gamepad{num}' device = f'/dev/input/event{dev}' try: vars(self)[gamepad] = InputDevice(device) try: self.selector.unregister(vars(self)[gamepad]) except: c3(f'Todavía no registrado {device}', c.azul) try: self.selector.register(vars(self)[gamepad], EVENT_READ) c3(f'Registrado {device}', c.cian) except: c3(f'{device} already registred', c.cian) except OSError as e: c3(f'No está conectado {device}') # Probando device + 1 dev += 1 device = f'/dev/input/event{dev}' try: vars(self)[gamepad] = InputDevice(device) try: self.selector.unregister(vars(self)[gamepad]) except: c3(f'Todavía no registrado {device}', c.azul) try: self.selector.register(vars(self)[gamepad], EVENT_READ) c3(f'Registrado {device}', c.cian) except: c3(f'{device} already registred', c.cian) except OSError as e: c3(f'Ni tampoco... {device}') def check_devices(self): while self.bt_on: # Si no están cargados, los intenta cargar y registrarlos en selector if self.gamepad1 is None: self.is_none(1, self.devices_list[0]) if self.gamepad2 is None: self.is_none(2, self.devices_list[1]) time.sleep(1) def input_bt(self, gp1, gp2): self.devices_list = [gp1, gp2] self.devices_dict= {f'/dev/input/event{gp1}':'c', f'/dev/input/event{gp2}':'c'} client.send_message('/bt_init', [gp1, gp2]) thread(self.check_devices) time.sleep(2) while self.bt_on: # Si ninguno de los dos está cargado, vuelve a intentar conectarlos if self.gamepad1 is None and self.gamepad2 is None: c3('No está conectado ninguno') time.sleep(1) continue # Revisa la lista de selector, esperando que llegue algo for key, mask in self.selector.select(): device = key.fileobj path = key.fileobj.path # Intenta leer en device. Si salta error... try: for event in device.read(): et, ec, ev = event.type, event.code, event.value if et == ecodes.EV_ABS: # Analogo if ec == 1: self.bt_send(path, 'h', -ev) if ec == 0: self.bt_send(path, 'v', -ev) if ec == 16 and ev == -1: self.bt_send_hat(path, 't', 1) elif ec == 16 and ev == 1: self.bt_send_hat(path, 'b', 1) elif ec == 17 and ev == -1: self.bt_send_hat(path, 'r', 1) elif ec == 17 and ev == 1: self.bt_send_hat(path, 'l', 1) if ec == 1 and ev == 0: self.bt_send_hat(path, 'r', 0) if ec == 1 and ev == 0: self.bt_send_hat(path, 'l', 0) if ec == 0 and ev == 0: self.bt_send_hat(path, 't', 0) if ec == 0 and ev == 0: self.bt_send_hat(path, 'b', 0) if et == ecodes.EV_KEY: if ec == self.but[0]: self.bt_send(path, 0, ev) elif ec == self.but[1]: self.bt_send(path, 1, ev) elif ec == self.but[2]: self.bt_send(path, 2, ev) elif ec == self.but[3]: self.bt_send(path, 3, ev) elif ec == self.but[4]: self.bt_send(path, 4, ev) # ... es porque el gamepad se apagó. Lo cierra y lo desregistra de selector except OSError as e: device.close() c3('input_bt() - Except - Se apagó un gamepad') if path[-2:] == '16': c3(f'¿Se apagó /dev/input/event{self.devices_list[0]}? Desregistrándolo...') if self.gamepad1 != None: self.selector.unregister(self.gamepad1) self.gamepad1 = None if path[-2:] == '20': c3(f'¿Se apagó /dev/input/event{self.devices_list[1]}? Desregistrándolo...') if self.gamepad2 != None: self.selector.unregister(self.gamepad2) self.gamepad2 = None # c4('input_bt() Fin de WHILE') if __name__ == '__main__': parser = argparse.ArgumentParser() parser.add_argument('--gp1', type=int, default=16,help='Gamepad 1') parser.add_argument('--gp2', type=int, default=20,help='Gamepad 2') args = parser.parse_args() bt = Bt() try: consola(f'"R": reconnect()', c.naranja) consola(f'"Q": quit', c.naranja) thread(bt.input_bt, [args.gp1, args.gp2]) while True: tecla = input() if tecla == 'r': bt.reconnect() elif tecla == 'q': sys.exit() except KeyboardInterrupt: print(' Bye')

此外，如果你不是我，这是加载的模块😁。

#!/usr/bin/env python3 import random, threading from pythonosc import udp_client targetIp = "127.0.0.1" targetPort = 10000 client = udp_client.SimpleUDPClient(targetIp, targetPort) client.send_message("/init", 1) class Gd: def __init__(self) -> None: self.gd = {'verbose': [True, True, True, True]} globalDict = Gd() class Color: def __init__(self): self.reset = '\\x1b[0m' self.blanco = '\\x1b[97m' self.negro = '\\x1b[90m' self.rojo = '\\x1b[91m' self.verde = '\\x1b[92m' self.azul = '\\x1b[94m' self.amarillo = '\\x1b[93m' self.magenta = '\\x1b[95m' self.magenta_bold = '\\x1b[95;1m' self.azul_bold = '\\x1b[94;1m' self.cian = '\\x1b[96m' self.naranja = '\\x1b[38;5;202m' self.violeta = '\\x1b[38;5;129m' self.rosa = '\\x1b[38;5;213m' self.ocre = '\\x1b[38;5;172m' self.marron = '\\x1b[38;5;52m' self.musgo = '\\x1b[38;5;58m' self.error = '\\x1b[93;41m' self.remoto = '\\x1b[93;42m' self.debug = '\\x1b[93;44m' self.lista_attrs = [] self.attrs = self.__dict__ for k, v in self.attrs.items(): if k not in ['lista_attrs', 'attrs', 'random']: self.lista_attrs.append(v) self.random = random.choice(self.lista_attrs) c = Color() # Threading def thread(function, args=[]): t = threading.Thread( target=function, args=(args), name=f'{function}({args})', daemon=True) t.start() def c1(texto, color_texto=c.azul_bold): if globalDict.gd['verbose'][0]: texto = str(texto) print(color_texto, texto, c.reset) def c2(texto, color_texto=c.azul): if globalDict.gd['verbose'][1]: texto = str(texto) print(color_texto, texto, c.reset) def c3(texto, color_texto=c.cian): if globalDict.gd['verbose'][2]: texto = str(texto) print(color_texto, texto, c.reset) def c4(texto, color_texto=c.rosa): if globalDict.gd['verbose'][3]: texto = str(texto) print(color_texto, texto, c.reset) def consola(texto, color_texto=c.verde): texto = str(texto) print(color_texto, texto, c.reset)