'
' Copyright (c) 2010 Apple Inc. All rights reserved.
'
' Licensed under the Apache License, Version 2.0 (the "License");
' you may not use this file except in compliance with the License.
' You may obtain a copy of the License at
'
' http://www.apache.org/licenses/LICENSE-2.0
'
' Unless required by applicable law or agreed to in writing, software
' distributed under the License is distributed on an "AS IS" BASIS,
' WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
' See the License for the specific language governing permissions and
' limitations under the License.
'
Public Class DNSServiceBrowser
Public WithEvents MyEventManager As New Bonjour.DNSSDEventManager
Private m_service As New Bonjour.DNSSDService
Private m_browser As Bonjour.DNSSDService
Private m_resolver As Bonjour.DNSSDService
Public Sub New()
MyBase.New()
'This call is required by the Windows Form Designer.
InitializeComponent()
ComboBox1.SelectedIndex = 0
End Sub
'Called when a service is found as a result of a browse operation
Public Sub MyEventManager_ServiceFound(ByVal browser As Bonjour.DNSSDService, ByVal flags As Bonjour.DNSSDFlags, ByVal ifIndex As UInteger, ByVal serviceName As String, ByVal regtype As String, ByVal domain As String) Handles MyEventManager.ServiceFound
Dim index As Integer
index = ServiceNames.Items.IndexOf(serviceName)
'
' A simple reference counting scheme is implemented so that the same service
' does not show up more than once in the browse list. This can happen
' if the machine has more than one network interface.
'
' If we have not seen this service before, then it is added to the browse list
' Otherwise it's reference count is bumped up.
'
If index = -1 Then
Dim browseData As New BrowseData
browseData.ServiceName = serviceName
browseData.RegType = regtype
browseData.Domain = domain
browseData.Refs = 1
ServiceNames.Items.Add(browseData)
Else
Dim browseData As BrowseData
browseData = ServiceNames.Items([index])
browseData.Refs += 1
End If
End Sub
Public Sub MyEventManager_ServiceLost(ByVal browser As Bonjour.DNSSDService, ByVal flags As Bonjour.DNSSDFlags, ByVal ifIndex As UInteger, ByVal serviceName As String, ByVal regtype As String, ByVal domain As String) Handles MyEventManager.ServiceLost
Dim index As Integer
'
' See the above about reference counting
'
index = ServiceNames.Items.IndexOf(serviceName)
If index <> -1 Then
Dim browseData As BrowseData
browseData = ServiceNames.Items([index])
browseData.Refs -= 1
If browseData.Refs = 0 Then
ServiceNames.Items.Remove(serviceName)
End If
End If
End Sub
Public Sub MyEventManager_ServiceResolved(ByVal resolver As Bonjour.DNSSDService, ByVal flags As Bonjour.DNSSDFlags, ByVal ifIndex As UInteger, ByVal fullname As String, ByVal hostname As String, ByVal port As UShort, ByVal record As Bonjour.TXTRecord) Handles MyEventManager.ServiceResolved
'
' Once the service is resolved, the resolve operation is stopped. This reduces the burdne on the network
'
m_resolver.Stop()
m_resolver = Nothing
Dim browseData As BrowseData = ServiceNames.Items.Item(ServiceNames.SelectedIndex)
NameField.Text = browseData.ServiceName
TypeField.Text = browseData.RegType
DomainField.Text = browseData.Domain
HostField.Text = hostname
PortField.Text = port
'
' The values found in the text record are assumed to be human readable strings.
'
If record IsNot Nothing Then
For i As UInteger = 0 To record.GetCount() - 1
Dim key As String = record.GetKeyAtIndex(i)
If key.Length() > 0 Then
TextRecord.Items.Add(key + "=" + System.Text.Encoding.ASCII.GetString(record.GetValueAtIndex(i)))
End If
Next i
End If
End Sub
Private Sub ClearServiceInfo()
TextRecord.Items.Clear()
NameField.Text = ""
TypeField.Text = ""
DomainField.Text = ""
HostField.Text = ""
PortField.Text = ""
End Sub
Private Sub ServiceNames_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ServiceNames.SelectedIndexChanged
If m_resolver IsNot Nothing Then
m_resolver.Stop()
End If
Me.ClearServiceInfo()
Dim browseData As BrowseData = ServiceNames.Items.Item(ServiceNames.SelectedIndex)
'
' Selecting a service instance starts a new resolve operation
'
m_resolver = m_service.Resolve(0, 0, browseData.ServiceName, browseData.RegType, browseData.Domain, MyEventManager)
End Sub
Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
If m_browser IsNot Nothing Then
m_browser.Stop()
End If
ServiceNames.Items.Clear()
Me.ClearServiceInfo()
'
' Selecting a service type start a new browse operation
'
m_browser = m_service.Browse(0, 0, ComboBox1.Items.Item(ComboBox1.SelectedIndex), "", MyEventManager)
End Sub
Private Sub ListBox2_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextRecord.SelectedIndexChanged
End Sub
End Class
Public Class BrowseData
Private m_serviceName As String
Private m_regType As String
Private m_domain As String
Private m_refs As Integer
Property ServiceName() As String
Get
Return m_serviceName
End Get
Set(ByVal Value As String)
m_serviceName = Value
End Set
End Property
Property RegType() As String
Get
Return m_regType
End Get
Set(ByVal Value As String)
m_regType = Value
End Set
End Property
Property Domain() As String
Get
Return m_domain
End Get
Set(ByVal Value As String)
m_domain = Value
End Set
End Property
Property Refs As Integer
Get
Return m_refs
End Get
Set(ByVal Value As Integer)
m_refs = Value
End Set
End Property
Public Overrides Function Equals(obj As Object) As Boolean
If obj Is Nothing Then
Return False
Else
Return m_serviceName.Equals(obj.ToString)
End If
End Function
Public Overrides Function ToString() As String
Return m_serviceName
End Function
End Class
