多个WindowsBaloonTip/TrayTip通知？

Question

如果您要使用以下代码在通知区域创建TrayTips（BaloonTips），您将注意到它只允许一条消息，然后卡住并出错。

的代码是从here采取：

# -- coding: utf-8 -- 

from win32api import * 
from win32gui import * 
import win32con 
import sys, os 
import struct 
import time 

class WindowsBalloonTip: 
    def __init__(self, title, msg): 
     message_map = { 
       win32con.WM_DESTROY: self.OnDestroy, 
     } 
     # Register the Window class. 
     wc = WNDCLASS() 
     hinst = wc.hInstance = GetModuleHandle(None) 
     wc.lpszClassName = "PythonTaskbar" 
     wc.lpfnWndProc = message_map # could also specify a wndproc. 
     classAtom = RegisterClass(wc) 
     # Create the Window. 
     style = win32con.WS_OVERLAPPED | win32con.WS_SYSMENU 
     self.hwnd = CreateWindow(classAtom, "Taskbar", style, \ 
       0, 0, win32con.CW_USEDEFAULT, win32con.CW_USEDEFAULT, \ 
       0, 0, hinst, None) 
     UpdateWindow(self.hwnd) 
     iconPathName = os.path.abspath(os.path.join(sys.path[0], "balloontip.ico")) 
     icon_flags = win32con.LR_LOADFROMFILE | win32con.LR_DEFAULTSIZE 
     try: 
      hicon = LoadImage(hinst, iconPathName, \ 
        win32con.IMAGE_ICON, 0, 0, icon_flags) 
     except: 
      hicon = LoadIcon(0, win32con.IDI_APPLICATION) 
     flags = NIF_ICON | NIF_MESSAGE | NIF_TIP 
     nid = (self.hwnd, 0, flags, win32con.WM_USER+20, hicon, "tooltip") 
     Shell_NotifyIcon(NIM_ADD, nid) 
     Shell_NotifyIcon(NIM_MODIFY, \ 
         (self.hwnd, 0, NIF_INFO, win32con.WM_USER+20,\ 
          hicon, "Balloon tooltip",msg,200,title)) 
     # self.show_balloon(title, msg) 
     time.sleep(10) 
     DestroyWindow(self.hwnd) 
    def OnDestroy(self, hwnd, msg, wparam, lparam): 
     nid = (self.hwnd, 0) 
     Shell_NotifyIcon(NIM_DELETE, nid) 
     PostQuitMessage(0) # Terminate the app. 

def balloon_tip(title, msg): 
    w=WindowsBalloonTip(title, msg) 

Answer 1

正如你可以看到，如果你尝试和发送多个balloon_tip的到WindowsBalloonTip类，你会收到以下错误：

File "C:/WindowsBalloonTip.py", line 20, in __init__ 
    classAtom = RegisterClass(wc) 
error: (1410, 'RegisterClass', 'Class already exists.') 

展望在Microsoft的RegisterClass文档中，您还需要注销该类以及使用UnregisterClass(lpClassName, hInstance)

http://msdn.microsoft.com/en-us/library/ms644899

我们可以通过添加做到这一点：classAtom = UnregisterClass(classAtom, hinst)但必须添加之后的窗口已经被破坏了这里的例子是一个固定的完整版

# -- coding: utf-8 -- 

from win32api import * 
from win32gui import * 
import win32con 
import sys, os 
import struct 
import time 

# Class 
class WindowsBalloonTip: 
    def __init__(self, title, msg): 
     message_map = { win32con.WM_DESTROY: self.OnDestroy,} 

     # Register the window class. 
     wc = WNDCLASS() 
     hinst = wc.hInstance = GetModuleHandle(None) 
     wc.lpszClassName = 'PythonTaskbar' 
     wc.lpfnWndProc = message_map # could also specify a wndproc. 
     classAtom = RegisterClass(wc) 

     # Create the window. 
     style = win32con.WS_OVERLAPPED | win32con.WS_SYSMENU 
     self.hwnd = CreateWindow(classAtom, "Taskbar", style, 0, 0, win32con.CW_USEDEFAULT, win32con.CW_USEDEFAULT, 0, 0, hinst, None) 
     UpdateWindow(self.hwnd) 

     # Icons managment 
     iconPathName = os.path.abspath(os.path.join(sys.path[0], 'balloontip.ico')) 
     icon_flags = win32con.LR_LOADFROMFILE | win32con.LR_DEFAULTSIZE 
     try: 
      hicon = LoadImage(hinst, iconPathName, win32con.IMAGE_ICON, 0, 0, icon_flags) 
     except: 
      hicon = LoadIcon(0, win32con.IDI_APPLICATION) 
     flags = NIF_ICON | NIF_MESSAGE | NIF_TIP 
     nid = (self.hwnd, 0, flags, win32con.WM_USER+20, hicon, 'Tooltip') 

     # Notify 
     Shell_NotifyIcon(NIM_ADD, nid) 
     Shell_NotifyIcon(NIM_MODIFY, (self.hwnd, 0, NIF_INFO, win32con.WM_USER+20, hicon, 'Balloon Tooltip', msg, 200, title)) 
     # self.show_balloon(title, msg) 
     time.sleep(5) 

     # Destroy 
     DestroyWindow(self.hwnd) 
     classAtom = UnregisterClass(classAtom, hinst) 
    def OnDestroy(self, hwnd, msg, wparam, lparam): 
     nid = (self.hwnd, 0) 
     Shell_NotifyIcon(NIM_DELETE, nid) 
     PostQuitMessage(0) # Terminate the app. 

# Function 
def balloon_tip(title, msg): 
    w=WindowsBalloonTip(title, msg) 

# Main 
if __name__ == '__main__': 
    # Example 
    balloon_tip('Lorem Ipsum', 'Neque porro quisquam est qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit...') 
    balloon_tip('Example two', 'There is no one who loves pain itself, who seeks after it and wants to have it, simply because it is pain...') 

有上有图标某些操作系统问题装载所以如果你想那么自己的自定义图标改变这一行：

iconPathName = os.path.abspath(os.path.join(sys.path[0], 'balloontip.ico')) 

喜欢的东西：

iconPathName = "C:\myfolder\myicon.ico"