NSUserNotificationCenter.defaultUserNotificationCenter() 在 python 中返回 None

问题描述

我正在尝试通过 python 连接到 Mountain Lion 通知中心.我已经安装了 pyobjc 并按照 here 和 这里.另请参阅:使用 PyObjC 使用 Mountain Lion 的通知中心

I am trying to connect to the Mountain Lion notification center via python. I've installed pyobjc and am following the instructions here and here. Also see: Working with Mountain Lion's Notification Center using PyObjC

这是我的代码:

import Foundation, objc
import AppKit
import sys

NSUserNotification = objc.lookUpClass('NSUserNotification')
NSUserNotificationCenter = objc.lookUpClass('NSUserNotificationCenter')

def notify(title, subtitle, info_text, delay=0, sound=False, userInfo={}):
    """ Python method to show a desktop notification on Mountain Lion. Where:
        title: Title of notification
        subtitle: Subtitle of notification
        info_text: Informative text of notification
        delay: Delay (in seconds) before showing the notification
        sound: Play the default notification sound
        userInfo: a dictionary that can be used to handle clicks in your
                  app's applicationDidFinishLaunching:aNotification method
    """
    notification = NSUserNotification.alloc().init()
    notification.setTitle_(title)
    notification.setSubtitle_(subtitle)
    notification.setInformativeText_(info_text)
    notification.setUserInfo_(userInfo)
    if sound:
        notification.setSoundName_("NSUserNotificationDefaultSoundName")
    notification.setDeliveryDate_(Foundation.NSDate.dateWithTimeInterval_sinceDate_(delay, Foundation.NSDate.date()))
    NSUserNotificationCenter.defaultUserNotificationCenter().scheduleNotification_(notification)

当我使用参数调用通知函数时，我收到一个属性错误:

When I call the notify function with arguments I get an attribute error:

AttributeError: 'NoneType' 对象没有属性 'scheduleNotification_'

我不明白为什么 NSUserNotificationCenter.defaultUserNotificationCenter() 返回一个 NoneType 对象.我无法在互联网或 SO 上查询有关此事的任何信息.

I don't understand why NSUserNotificationCenter.defaultUserNotificationCenter() is returning a NoneType object. I've not been able to query anything on this matter on the internet or SO.

推荐答案

因此，使用 Ned 的使用默认 Python 的建议可以很好地工作.当我在 32 位 enthought 发行版上安装 pyobjc 时，它也有效.在我看来 pyobjc 仅适用于 32 位 python 发行版(我无法确认这一点，但到目前为止似乎确实如此).

So, this works fine using Ned's advice of using default python. It also worked when I installed pyobjc on the 32-bit enthought distribution. It seems to me that pyobjc works only on 32 bit python distributions (I cannot confirm this, but so far this seems to be the case).

(注意:当我发布问题时，我已经在 64 位 enthought 发行版上安装了 pyobjc).

(Note: When I posted the question I had installed pyobjc on the 64 bit enthought distribution).

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