PTB-WARNING：在 PsychHID 调用期间：其他 运行 应用程序阻止我访问 keyboard/keypad/mouse/
PTB-WARNING: During PsychHID invocation: Some other running application is preventing me from accessing the keyboard/keypad/mouse/
我在 Python 中使用 Psychopy 模块。我的代码调用 waitKeys(...) 来获取按键和反应时间。 90% 的时间它运行完美，但偶尔当我启动它时我得到这个（正是这个，不是无限重复）：
PTB-WARNING: During PsychHID invocation: Some other running application is preventing me from accessing the keyboard/keypad/mouse/...!
PTB-WARNING: This is likely a security measure, e.g., to protect some active password entry field.
PTB-WARNING: Please identify and quit the offending application. E.g., some versions of Firefox are known to cause such problems...
PTB-WARNING: During PsychHID invocation: Some other running application is preventing me from accessing the keyboard/keypad/mouse/...!
PTB-WARNING: This is likely a security measure, e.g., to protect some active password entry field.
PTB-WARNING: Please identify and quit the offending application. E.g., some versions of Firefox are known to cause such problems...
PTB-WARNING: During PsychHID invocation: Some other running application is preventing me from accessing the keyboard/keypad/mouse/...!
PTB-WARNING: This is likely a security measure, e.g., to protect some active password entry field.
PTB-WARNING: Please identify and quit the offending application. E.g., some versions of Firefox are known to cause such problems...
PTB-WARNING: During PsychHID invocation: Some other running application is preventing me from accessing the keyboard/keypad/mouse/...!
PTB-WARNING: This is likely a security measure, e.g., to protect some active password entry field.
PTB-WARNING: Please identify and quit the offending application. E.g., some versions of Firefox are known to cause such problems...
PTB-WARNING: During PsychHID invocation: Some other running application is preventing me from accessing the keyboard/keypad/mouse/...!
PTB-WARNING: This is likely a security measure, e.g., to protect some active password entry field.
PTB-WARNING: Please identify and quit the offending application. E.g., some versions of Firefox are known to cause such problems...
毫不奇怪，它不会响应我的任何击键，只会响应 control-C。
我只是 运行 终端（启动脚本），Xcode（编辑 python 脚本）和 Safari，只打开了几个普通网站（stackoverlow.com、discourse.psychopy.org 和 google.com 用于搜索）。我可以停止此行为的唯一方法是注销然后重新登录。关闭终端 window 并打开一个新终端并不能解决问题。从终端退出并重新启动它并不能解决问题。退出所有 运行 应用程序然后重新启动终端无法解决问题。
有时，当它发生时，我会在下次启动时发生这种情况之前用 control-C 退出应用程序。因此，也许 Psychopy 仍在后台留下一些孤立的线程 运行，来自之前的脚本调用，并且该线程尚未放弃其对键盘的要求？我怎么知道？我该如何在我的代码中解决这个问题？
相关代码如下：
**from** psychopy **import** prefs
prefs.hardware['audioLib'] = ['PTB'] # Prepare to use the right audio backend before importing sound
latencyMode = 4 # For PTB. 0, 1, 2, 3, 4
prefs.hardware['audioLatencyMode'] = [str(latencyMode)]
from psychopy.sound.backend_ptb **import** SoundPTB
from psychopy.hardware **import** keyboard
kb = keyboard.Keyboard() # Set up a keyboard device
targetAudio = SoundPTB(listFiles[thisAudioIndex])
targetAudio.play()
keys = kb.waitKeys(keyList = ["return", "space", "down", "right"],
waitRelease=False)
targetAudio.stop()
2017 款 MacBook Pro，使用内置键盘。 macOS 11.4，Python 3.8。
我还在 discourse.psychopy.org
上发布了这个
已解决（有点！）。
出于 UI 原因，我阻止了在实验期间键入的键被回显到屏幕（否则屏幕会充满随机垃圾）。我通过将 stty -echo 发送给父 shell.
来做到这一点
但是当退出程序时（出于任何原因）我需要通过发送 stty echo 来撤消它。所以我设置了一个退出处理程序：
def onExit():
"""Restore keystroke echo when we exit"""
os.system('stty echo')
但是如果用户键入 control-C 那么这样的退出处理程序将不会被执行，所以我还必须捕获 control-C:
def captureControl_C(signum, frame):
"""If user types control-c, restore keystroke echo before quitting"""
# Restore the original signal handler, otherwise evil things will happen
# if CTRL+C is pressed while we are already here, e.g. "c" key bounced
signal.signal(signal.SIGINT, originalSigintHandler)
os.system('stty echo')
raise KeyboardInterrupt # So we still see the stack trace on the screen
详情见here。
这给我们带来了问题。我连接上面的退出处理程序并在 __main__:
中使用以下 3 行进行陷阱
os.system('stty -echo') # Stop any echo of keystrokes to the Terminal window.
atexit.register(onExit) # Restore keyboard echo when quitting
#
# BUT if user types control-c, then restore keyboard echo!
# Otherwise the Terminal window looks unresponsive.
#
originalSigintHandler = signal.signal(signal.SIGINT, captureControl_C)
当这 3 行在 __main__ 中时，一切都完美无缺。但后来我将它们转移到一个从 main 调用的函数 initialSetup() 中。为此，我当然必须先于他们
global originalSigintHandler # So that captureControl_C() can see it
将关键的 3 行移动到 initialSetup() 导致对 waitKeys() 的后续调用挂起，并在我最初的 post 中出现所有这些警告。将它们移回 __main__ 修复了它。
如果有人能解释原因，我会很高兴。
我在 Python 中使用 Psychopy 模块。我的代码调用 waitKeys(...) 来获取按键和反应时间。 90% 的时间它运行完美，但偶尔当我启动它时我得到这个（正是这个，不是无限重复）：
PTB-WARNING: During PsychHID invocation: Some other running application is preventing me from accessing the keyboard/keypad/mouse/...!
PTB-WARNING: This is likely a security measure, e.g., to protect some active password entry field.
PTB-WARNING: Please identify and quit the offending application. E.g., some versions of Firefox are known to cause such problems...
PTB-WARNING: During PsychHID invocation: Some other running application is preventing me from accessing the keyboard/keypad/mouse/...!
PTB-WARNING: This is likely a security measure, e.g., to protect some active password entry field.
PTB-WARNING: Please identify and quit the offending application. E.g., some versions of Firefox are known to cause such problems...
PTB-WARNING: During PsychHID invocation: Some other running application is preventing me from accessing the keyboard/keypad/mouse/...!
PTB-WARNING: This is likely a security measure, e.g., to protect some active password entry field.
PTB-WARNING: Please identify and quit the offending application. E.g., some versions of Firefox are known to cause such problems...
PTB-WARNING: During PsychHID invocation: Some other running application is preventing me from accessing the keyboard/keypad/mouse/...!
PTB-WARNING: This is likely a security measure, e.g., to protect some active password entry field.
PTB-WARNING: Please identify and quit the offending application. E.g., some versions of Firefox are known to cause such problems...
PTB-WARNING: During PsychHID invocation: Some other running application is preventing me from accessing the keyboard/keypad/mouse/...!
PTB-WARNING: This is likely a security measure, e.g., to protect some active password entry field.
PTB-WARNING: Please identify and quit the offending application. E.g., some versions of Firefox are known to cause such problems...
毫不奇怪，它不会响应我的任何击键，只会响应 control-C。
我只是 运行 终端（启动脚本），Xcode（编辑 python 脚本）和 Safari，只打开了几个普通网站（stackoverlow.com、discourse.psychopy.org 和 google.com 用于搜索）。我可以停止此行为的唯一方法是注销然后重新登录。关闭终端 window 并打开一个新终端并不能解决问题。从终端退出并重新启动它并不能解决问题。退出所有 运行 应用程序然后重新启动终端无法解决问题。
有时，当它发生时，我会在下次启动时发生这种情况之前用 control-C 退出应用程序。因此，也许 Psychopy 仍在后台留下一些孤立的线程 运行，来自之前的脚本调用，并且该线程尚未放弃其对键盘的要求？我怎么知道？我该如何在我的代码中解决这个问题？
相关代码如下：
**from** psychopy **import** prefs
prefs.hardware['audioLib'] = ['PTB'] # Prepare to use the right audio backend before importing sound
latencyMode = 4 # For PTB. 0, 1, 2, 3, 4
prefs.hardware['audioLatencyMode'] = [str(latencyMode)]
from psychopy.sound.backend_ptb **import** SoundPTB
from psychopy.hardware **import** keyboard
kb = keyboard.Keyboard() # Set up a keyboard device
targetAudio = SoundPTB(listFiles[thisAudioIndex])
targetAudio.play()
keys = kb.waitKeys(keyList = ["return", "space", "down", "right"],
waitRelease=False)
targetAudio.stop()
2017 款 MacBook Pro，使用内置键盘。 macOS 11.4，Python 3.8。 我还在 discourse.psychopy.org
上发布了这个已解决（有点！）。
出于 UI 原因，我阻止了在实验期间键入的键被回显到屏幕（否则屏幕会充满随机垃圾）。我通过将 stty -echo 发送给父 shell.
但是当退出程序时（出于任何原因）我需要通过发送 stty echo 来撤消它。所以我设置了一个退出处理程序：
def onExit():
"""Restore keystroke echo when we exit"""
os.system('stty echo')
但是如果用户键入 control-C 那么这样的退出处理程序将不会被执行，所以我还必须捕获 control-C:
def captureControl_C(signum, frame):
"""If user types control-c, restore keystroke echo before quitting"""
# Restore the original signal handler, otherwise evil things will happen
# if CTRL+C is pressed while we are already here, e.g. "c" key bounced
signal.signal(signal.SIGINT, originalSigintHandler)
os.system('stty echo')
raise KeyboardInterrupt # So we still see the stack trace on the screen
详情见here。
这给我们带来了问题。我连接上面的退出处理程序并在 __main__:
os.system('stty -echo') # Stop any echo of keystrokes to the Terminal window.
atexit.register(onExit) # Restore keyboard echo when quitting
#
# BUT if user types control-c, then restore keyboard echo!
# Otherwise the Terminal window looks unresponsive.
#
originalSigintHandler = signal.signal(signal.SIGINT, captureControl_C)
当这 3 行在 __main__ 中时，一切都完美无缺。但后来我将它们转移到一个从 main 调用的函数 initialSetup() 中。为此，我当然必须先于他们
global originalSigintHandler # So that captureControl_C() can see it
将关键的 3 行移动到 initialSetup() 导致对 waitKeys() 的后续调用挂起，并在我最初的 post 中出现所有这些警告。将它们移回 __main__ 修复了它。
如果有人能解释原因，我会很高兴。