discovery.py
author Edouard Tisserant
Thu, 22 Sep 2011 17:33:34 +0200
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# -*- coding: utf-8 -*-
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#This file is part of Beremiz, a Integrated Development Environment for
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#programming IEC 61131-3 automates supporting plcopen standard and CanFestival. 
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#
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#Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
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#
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#See COPYING file for copyrights details.
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#
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#This library is free software; you can redistribute it and/or
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#modify it under the terms of the GNU General Public
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#License as published by the Free Software Foundation; either
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#version 2.1 of the License, or (at your option) any later version.
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#
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#This library is distributed in the hope that it will be useful,
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#but WITHOUT ANY WARRANTY; without even the implied warranty of
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#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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#General Public License for more details.
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#
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#You should have received a copy of the GNU General Public
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#License along with this library; if not, write to the Free Software
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#Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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import socket
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import wx
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import  wx.lib.mixins.listctrl  as  listmix
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from Zeroconf import *
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import connectors
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class AutoWidthListCtrl(wx.ListCtrl, listmix.ListCtrlAutoWidthMixin):
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    def __init__(self, parent, id, name, pos=wx.DefaultPosition,
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                 size=wx.DefaultSize, style=0):
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        wx.ListCtrl.__init__(self, parent, id, pos, size, style, name=name)
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        listmix.ListCtrlAutoWidthMixin.__init__(self)
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[ID_DISCOVERYDIALOG, ID_DISCOVERYDIALOGSTATICTEXT1, 
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 ID_DISCOVERYDIALOGSERVICESLIST, ID_DISCOVERYDIALOGREFRESHBUTTON, 
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 ID_DISCOVERYDIALOGLOCALBUTTON, 
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] = [wx.NewId() for _init_ctrls in range(5)]
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class DiscoveryDialog(wx.Dialog, listmix.ColumnSorterMixin):
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    def _init_coll_MainSizer_Items(self, parent):
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        parent.AddWindow(self.staticText1, 0, border=20, flag=wx.TOP|wx.LEFT|wx.RIGHT|wx.GROW)
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        parent.AddWindow(self.ServicesList, 0, border=20, flag=wx.LEFT|wx.RIGHT|wx.GROW)
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        parent.AddSizer(self.ButtonGridSizer, 0, border=20, flag=wx.LEFT|wx.RIGHT|wx.BOTTOM|wx.GROW)
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    def _init_coll_MainSizer_Growables(self, parent):
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        parent.AddGrowableCol(0)
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        parent.AddGrowableRow(1)
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    def _init_coll_ButtonGridSizer_Items(self, parent):
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        parent.AddWindow(self.RefreshButton, 0, border=0, flag=0)
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        parent.AddWindow(self.LocalButton, 0, border=0, flag=0)
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        parent.AddSizer(self.ButtonSizer, 0, border=0, flag=0)
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    def _init_coll_ButtonGridSizer_Growables(self, parent):
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        parent.AddGrowableCol(0)
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        parent.AddGrowableCol(1)
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        parent.AddGrowableRow(1)
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    def _init_sizers(self):
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        self.MainSizer = wx.FlexGridSizer(cols=1, hgap=0, rows=3, vgap=10)
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        self.ButtonGridSizer = wx.FlexGridSizer(cols=3, hgap=5, rows=1, vgap=0)
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        self._init_coll_MainSizer_Items(self.MainSizer)
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        self._init_coll_MainSizer_Growables(self.MainSizer)
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        self._init_coll_ButtonGridSizer_Items(self.ButtonGridSizer)
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        self._init_coll_ButtonGridSizer_Growables(self.ButtonGridSizer)
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        self.SetSizer(self.MainSizer)
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    def _init_ctrls(self, prnt):
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        wx.Dialog.__init__(self, id=ID_DISCOVERYDIALOG, 
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              name='DiscoveryDialog', parent=prnt,  
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              size=wx.Size(600, 600), style=wx.DEFAULT_DIALOG_STYLE,
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              title='Service Discovery')
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        self.staticText1 = wx.StaticText(id=ID_DISCOVERYDIALOGSTATICTEXT1,
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              label=_('Services available:'), name='staticText1', parent=self,
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              pos=wx.Point(0, 0), size=wx.DefaultSize, style=0)
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        # Set up list control
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        self.ServicesList = AutoWidthListCtrl(id=ID_DISCOVERYDIALOGSERVICESLIST,
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              name='ServicesList', parent=self, pos=wx.Point(0, 0), size=wx.Size(0, 0), 
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              style=wx.LC_REPORT|wx.LC_EDIT_LABELS|wx.LC_SORT_ASCENDING|wx.LC_SINGLE_SEL)
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        self.ServicesList.InsertColumn(0, 'NAME')
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        self.ServicesList.InsertColumn(1, 'TYPE')
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        self.ServicesList.InsertColumn(2, 'IP')
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        self.ServicesList.InsertColumn(3, 'PORT')
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        self.ServicesList.SetColumnWidth(0, 150)
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        self.ServicesList.SetColumnWidth(1, 150)
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        self.ServicesList.SetColumnWidth(2, 150)
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        self.ServicesList.SetColumnWidth(3, 150)
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        self.Bind(wx.EVT_LIST_ITEM_SELECTED, self.OnItemSelected, id=ID_DISCOVERYDIALOGSERVICESLIST)
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        self.Bind(wx.EVT_LIST_ITEM_ACTIVATED, self.OnItemActivated, id=ID_DISCOVERYDIALOGSERVICESLIST)
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        listmix.ColumnSorterMixin.__init__(self, 4)
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        self.RefreshButton = wx.Button(id=ID_DISCOVERYDIALOGREFRESHBUTTON,
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              label=_('Refresh'), name='RefreshButton', parent=self,
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              pos=wx.Point(0, 0), size=wx.DefaultSize, style=0)
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        self.Bind(wx.EVT_BUTTON, self.OnRefreshButton, id=ID_DISCOVERYDIALOGREFRESHBUTTON)
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        self.LocalButton = wx.Button(id=ID_DISCOVERYDIALOGLOCALBUTTON,
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              label=_('Local'), name='LocalButton', parent=self,
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              pos=wx.Point(0, 0), size=wx.DefaultSize, style=0)
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        self.Bind(wx.EVT_BUTTON, self.OnLocalButton, id=ID_DISCOVERYDIALOGLOCALBUTTON)
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        self.ButtonSizer = self.CreateButtonSizer(wx.OK|wx.CANCEL|wx.CENTER)
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        self._init_sizers()
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    def __init__(self, parent):
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        self._init_ctrls(parent)
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        self.itemDataMap = {}
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        self.nextItemId = 0
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        self.URI = None
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        self.Browsers = []
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        self.ZeroConfInstance = Zeroconf()
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        self.RefreshList()
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    def __del__(self):
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        for browser in self.Browsers:
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            browser.cancel()
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        self.ZeroConfInstance.close()
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    def RefreshList(self):
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        for browser in self.Browsers:
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            browser.cancel()
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        self.Browsers = []
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        for t in connectors.dnssd_connectors.keys():
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            self.Browsers.append(ServiceBrowser(self.ZeroConfInstance, t, self))
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    def OnRefreshButton(self, event):
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        self.ServicesList.DeleteAllItems()
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        self.RefreshList()
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    def OnLocalButton(self, event):
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        self.URI = "LOCAL://"
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        self.EndModal(wx.ID_OK)
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        event.Skip()
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    # Used by the ColumnSorterMixin, see wx/lib/mixins/listctrl.py
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    def GetListCtrl(self):
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        return self.ServicesList
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    def getColumnText(self, index, col):
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        item = self.ServicesList.GetItem(index, col)
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        return item.GetText()
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    def OnItemSelected(self, event):
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        self.SetURI(event.m_itemIndex)
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        event.Skip()
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    def OnItemActivated(self, event):
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        self.SetURI(event.m_itemIndex)
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        self.EndModal(wx.ID_OK)
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        event.Skip()
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    def SetURI(self, idx):
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        connect_type = self.getColumnText(idx, 1)
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        connect_address = self.getColumnText(idx, 2)
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        connect_port = self.getColumnText(idx, 3)
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        self.URI = "%s://%s:%s"%(connect_type, connect_address, connect_port)
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    def GetURI(self):
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        return self.URI
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    def removeService(self, zeroconf, type, name):
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        '''
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        called when a service with the desired type goes offline.
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        '''
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        # loop through the list items looking for the service that went offline
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        for idx in xrange(self.ServicesList.GetItemCount()):
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            # this is the unique identifier assigned to the item
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            item_id = self.ServicesList.GetItemData(idx)
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            # this is the full typename that was received by addService
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            item_name = self.itemDataMap[item_id][4]
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            if item_name == name:
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                self.ServicesList.DeleteItem(idx)
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                break
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    def addService(self, zeroconf, type, name):
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        '''
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        called when a service with the desired type is discovered.
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        '''
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        info = self.ZeroConfInstance.getServiceInfo(type, name)
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        svcname  = name.split(".")[0]
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        typename = type.split(".")[0][1:]
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        ip       = str(socket.inet_ntoa(info.getAddress()))
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        port     = info.getPort()
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        num_items = self.ServicesList.GetItemCount()
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        # display the new data in the list
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        new_item = self.ServicesList.InsertStringItem(num_items, svcname)
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        self.ServicesList.SetStringItem(new_item, 1, "%s" % typename)
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        self.ServicesList.SetStringItem(new_item, 2, "%s" % ip)
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        self.ServicesList.SetStringItem(new_item, 3, "%s" % port)
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        # record the new data for the ColumnSorterMixin
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        # we assign every list item a unique id (that won't change when items
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        # are added or removed)
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        self.ServicesList.SetItemData(new_item, self.nextItemId)
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        # the value of each column has to be stored in the itemDataMap
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        # so that ColumnSorterMixin knows how to sort the column.
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        # "name" is included at the end so that self.removeService
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        # can access it.
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        self.itemDataMap[self.nextItemId] = [ svcname, typename, ip, port, name ]
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        self.nextItemId += 1
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