private static UdpAnySourceMulticastClient CreateMulticastClientAndJoinGroup(string ipAddress, int localPort)
{
var retVal = new UdpAnySourceMulticastClient(IPAddress.Parse(ipAddress), localPort);
var signal = new System.Threading.ManualResetEvent(false);
try
{
retVal.BeginJoinGroup(
(joinResult) =>
{
retVal.EndJoinGroup(joinResult);
retVal.MulticastLoopback = true;
retVal.SendBufferSize = retVal.ReceiveBufferSize = SsdpConstants.DefaultUdpSocketBufferSize;
signal.Set();
}, null);
signal.WaitOne();
}
finally
{
signal.Dispose();
}
return(retVal);
}
internal static void Join()
{
// Initialize the receive buffer
_receiveBuffer = new byte[MAX_MESSAGE_SIZE];
// Create the UdpAnySourceMulticastClient instance using the defined
// GROUP_ADDRESS and GROUP_PORT constants. UdpAnySourceMulticastClient is a
// client receiver for multicast traffic from any source, also known as Any Source Multicast (ASM)
_client = new UdpAnySourceMulticastClient(IPAddress.Parse(GROUP_ADDRESS), GROUP_PORT);
// Make a request to join the group.
_client.BeginJoinGroup(
result =>
{
// Complete the join
_client.EndJoinGroup(result);
// The MulticastLoopback property controls whether you receive multicast
// packets that you send to the multicast group. Default value is true,
// meaning that you also receive the packets you send to the multicast group.
// To stop receiving these packets, you can set the property following to false
_client.MulticastLoopback = true;
// Set a flag indicating that we have now joined the multicast group
_joined = true;
Receive();
}, null);
}
public void StartFinder()
{
try
{
_receiveBuffer = new byte[MAX_MESSAGE_SIZE];
// Create the UdpAnySourceMulticastClient instance using the defined
// GROUP_ADDRESS and GROUP_PORT constants. UdpAnySourceMulticastClient is a
// client receiver for multicast traffic from any source, also known as Any Source Multicast (ASM)
_client = new UdpAnySourceMulticastClient(IPAddress.Parse(GROUP_ADDRESS), GROUP_PORT);
// Make a request to join the group.
_client.BeginJoinGroup(
result =>
{
// Complete the join
_client.EndJoinGroup(result);
// The MulticastLoopback property controls whether you receive multicast
// packets that you send to the multicast group. Default value is true,
// meaning that you also receive the packets you send to the multicast group.
// To stop receiving these packets, you can set the property following to false
_client.MulticastLoopback = false;
// Set a flag indicating that we have now joined the multicast group
_joined = true;
// Wait for data from the group. This is an asynchronous operation
// and will not block the UI thread.
Receive();
}, null);
}
catch { }
}
// コンストラクター
public MainPage()
{
InitializeComponent();
// 100ミリ秒毎に満了する様にタイマーを開始
readTimer = new System.Windows.Threading.DispatcherTimer();
readTimer.Tick += new EventHandler(readTimer_Tick);
readTimer.Interval = TimeSpan.FromMilliseconds(100);
//readTimer.Start();
try {
canvas1.Width = width;
canvas1.Height = height;
myClient.BeginJoinGroup(
result =>
{
try {
myClient.EndJoinGroup(result);
myClient.MulticastLoopback = true;
}
catch (Exception ex) {
MessageBox.Show("Join succeeded. but something wrong. " + ex.Message);
}
}, null
);
Receive();
}
catch (Exception ex) {
MessageBox.Show("Join failed. " + ex.Message);
}
}
/// <summary>
/// Extends BeginJoinGroup so that when a state object is not needed, null does not need to be passed.
/// <example>
/// udpanysourcemulticastclient.BeginJoinGroup(callback);
/// </example>
/// </summary>
public static IAsyncResult BeginJoinGroup(this UdpAnySourceMulticastClient udpanysourcemulticastclient, AsyncCallback callback)
{
if (udpanysourcemulticastclient == null)
{
throw new ArgumentNullException("udpanysourcemulticastclient");
}
return(udpanysourcemulticastclient.BeginJoinGroup(callback, null));
}
public void Find(Action <IPAddress> callback)
{
FoundCallback = callback;
MulticastSocket = new UdpAnySourceMulticastClient(IPAddress.Parse("239.255.255.250"), PortNumber);
MulticastSocket.BeginJoinGroup((result) =>
{
try
{
MulticastSocket.EndJoinGroup(result);
GroupJoined(result);
}
catch (Exception ex)
{
Debug.WriteLine("EndjoinGroup exception {0}", ex.Message);
// This can happen eg when wifi is off
FoundCallback(null);
}
},
null);
}
public IPAddress Find()
{
WaitEvent.Reset();
MulticastSocket = new UdpAnySourceMulticastClient(IPAddress.Parse("239.255.255.250"), PortNumber);
MulticastSocket.BeginJoinGroup((result) =>
{
try
{
MulticastSocket.EndJoinGroup(result);
GroupJoined(result);
}
catch (Exception ex)
{
WaitEvent.Set();
Debug.WriteLine("EndjoinGroup exception {0}", ex.Message);
}
},
null);
WaitEvent.WaitOne();
return(FoundIPAddress);
}