无法在 wxPython 中正确使用 wx.NotificationMessage

Question

我最近升级到了 wxPython 的开发版本（wxPython 2.9.2.4），因为我需要在我的应用程序中使用 wx.NotificationMessage 的功能。由于我认为可能是一个错误，我一直在尝试在某些用户事件上创建通知气泡，但没有成功。在提交这样的错误之前，我想继续询问邮件列表中的人们他们认为可能是什么问题，并希望从我的代码中找到解决方案。

以下是我使用的代码：

import wx, sys

app = wx.PySimpleApp()

class TestTaskBarIcon(wx.TaskBarIcon):

    def __init__(self):
        wx.TaskBarIcon.__init__(self)
        # create a test icon
        bmp = wx.EmptyBitmap(16, 16)
        dc = wx.MemoryDC(bmp)
        dc.SetBrush(wx.RED_BRUSH)
        dc.Clear()
        dc.SelectObject(wx.NullBitmap)

        testicon = wx.EmptyIcon()
        testicon.CopyFromBitmap(bmp)

        self.SetIcon(testicon)
        self.Bind(wx.EVT_TASKBAR_LEFT_UP, lambda e: (self.RemoveIcon(),sys.exit()))

        wx.NotificationMessage("", "Hello world!").Show()

icon = TestTaskBarIcon()
app.MainLoop()

在我的 Windows 7 计算机上，该代码创建一个白色的小任务栏图标，并创建一个带有短语“Hello World!”的弹出窗口。问题？该消息不在我的图标上。正在创建另一个图标，并将消息放置在那里。 看这张图片： http://www.pasteall.org/pic/18068">

我的想法是，这可能是由于我在第 22 行没有传递任何父参数：

wx.NotificationMessage("", "Hello world!").Show()

这是我将其更改为：

wx.NotificationMessage("", "Hello world!", self).Show()

Where 'self ' 指的是任务栏图标。当我这样做时，我得到一个错误：

Traceback (most recent call last):
  File "C:\Python27\testnotificationmessage.py", line 24, in <module>
    icon = TestTaskBarIcon()
  File "C:\Python27\testnotificationmessage.py", line 22, in __init__
    wx.NotificationMessage("", "Hello world!", self).Show()
  File "C:\Python27\lib\site-packages\wx-2.9.2-msw\wx\_misc.py", line 1213, in __init__
    _misc_.NotificationMessage_swiginit(self,_misc_.new_NotificationMessage(*args))
TypeError: in method 'new_NotificationMessage', expected argument 3 of type 'wxWindow *'

这是怎么回事？如果我删除该参数，我不会得到结果，如果我添加该参数，我会得到一个错误！应该使用wx.NotificationMessage 与 wx.TaskBarIcon！

请帮忙！如果您需要更多信息，请发表评论！

Answer 1

我目前还不建议使用 2.9。我在尝试时遇到了一些奇怪的错误。

您可以在 2.8 中拥有相同的功能。我正在使用一段时间前发现的经过修改的代码。

import wx, sys

try:
    import win32gui #, win32con
    WIN32 = True
except:
    WIN32 = False

class BalloonTaskBarIcon(wx.TaskBarIcon):
    """
    Base Taskbar Icon Class
    """
    def __init__(self):
        wx.TaskBarIcon.__init__(self)
        self.icon = None
        self.tooltip = ""

    def ShowBalloon(self, title, text, msec = 0, flags = 0):
        """
        Show Balloon tooltip
         @param title - Title for balloon tooltip
         @param msg   - Balloon tooltip text
         @param msec  - Timeout for balloon tooltip, in milliseconds
         @param flags -  one of wx.ICON_INFORMATION, wx.ICON_WARNING, wx.ICON_ERROR
        """
        if WIN32 and self.IsIconInstalled():
            try:
                self.__SetBalloonTip(self.icon.GetHandle(), title, text, msec, flags)
            except Exception:
                pass # print(e) Silent error

    def __SetBalloonTip(self, hicon, title, msg, msec, flags):

        # translate flags
        infoFlags = 0

        if flags & wx.ICON_INFORMATION:
            infoFlags |= win32gui.NIIF_INFO
        elif flags & wx.ICON_WARNING:
            infoFlags |= win32gui.NIIF_WARNING
        elif flags & wx.ICON_ERROR:
            infoFlags |= win32gui.NIIF_ERROR

        # Show balloon
        lpdata = (self.__GetIconHandle(),   # hWnd
                  99,                       # ID
                  win32gui.NIF_MESSAGE|win32gui.NIF_INFO|win32gui.NIF_ICON, # flags: Combination of NIF_* flags
                  0,                        # CallbackMessage: Message id to be pass to hWnd when processing messages
                  hicon,                    # hIcon: Handle to the icon to be displayed
                  '',                       # Tip: Tooltip text
                  msg,                      # Info: Balloon tooltip text
                  msec,                     # Timeout: Timeout for balloon tooltip, in milliseconds
                  title,                    # InfoTitle: Title for balloon tooltip
                  infoFlags                 # InfoFlags: Combination of NIIF_* flags
                  )
        win32gui.Shell_NotifyIcon(win32gui.NIM_MODIFY, lpdata)

        self.SetIcon(self.icon, self.tooltip)   # Hack: because we have no access to the real CallbackMessage value

    def __GetIconHandle(self):
        """
        Find the icon window.
        This is ugly but for now there is no way to find this window directly from wx
        """
        if not hasattr(self, "_chwnd"):
            try:
                for handle in wx.GetTopLevelWindows():
                    if handle.GetWindowStyle():
                        continue
                    handle = handle.GetHandle()
                    if len(win32gui.GetWindowText(handle)) == 0:
                        self._chwnd = handle
                        break
                if not hasattr(self, "_chwnd"):
                    raise Exception
            except:
                raise Exception, "Icon window not found"
        return self._chwnd

    def SetIcon(self, icon, tooltip = ""):
        self.icon = icon
        self.tooltip = tooltip
        wx.TaskBarIcon.SetIcon(self, icon, tooltip)

    def RemoveIcon(self):
        self.icon = None
        self.tooltip = ""
        wx.TaskBarIcon.RemoveIcon(self)

# ===================================================================
app = wx.PySimpleApp()

class TestTaskBarIcon(BalloonTaskBarIcon):

    def __init__(self):
        wx.TaskBarIcon.__init__(self)
        # create a test icon
        bmp = wx.EmptyBitmap(16, 16)
        dc = wx.MemoryDC(bmp)
        dc.SetBrush(wx.RED_BRUSH)
        dc.Clear()
        dc.SelectObject(wx.NullBitmap)

        testicon = wx.EmptyIcon()
        testicon.CopyFromBitmap(bmp)

        self.SetIcon(testicon)
        self.Bind(wx.EVT_TASKBAR_LEFT_UP, lambda e: (self.RemoveIcon(),sys.exit()))

        self.ShowBalloon("", "Hello world!")

icon = TestTaskBarIcon()
app.MainLoop()

Answer 2

TaskBarIcon 中有一个未公开的隐藏方法，名为 ShowBalloon，仅针对 Windows 实现。

来自来源：

def ShowBalloon(*args, **kwargs):
    """
    ShowBalloon(self, String title, String text, unsigned int msec=0, int flags=0) -> bool

    Show a balloon notification (the icon must have been already
    initialized using SetIcon).  Only implemented for Windows.

    title and text are limited to 63 and 255 characters respectively, msec
    is the timeout, in milliseconds, before the balloon disappears (will
    be clamped down to the allowed 10-30s range by Windows if it's outside
    it) and flags can include wxICON_ERROR/INFO/WARNING to show a
    corresponding icon

    Returns True if balloon was shown, False on error (incorrect parameters
    or function unsupported by OS)

    """
    return _windows_.TaskBarIcon_ShowBalloon(*args, **kwargs)

我在 Windows 上使用 wxPython 2.9.4.0 进行了测试，效果很好。