B4J Question UDPsocket.close

[HansDieter]

Hello,

i'm initializing an UDP.Socket in APPSTART. On a config-form i give the user the option to change the port for listening. To do so i try to close the socket with the old port and initialize a new one with the new port. Executeing the socket.close (i tried in debug mode executing step by step) statement throws some JAVA exeptions.

Here an excerpt from my code:

Sub Process_Globals
    Private fx As JFX
    Private MainForm As Form
    Private btn_save_port As Button
    Private localport As TextField
    Private msgbox As Msgboxes
    Private UDPSocket1 As UDPSocket
End Sub
Sub AppStart (Form1 As Form, Args() As String)
    UDPSocket1.Initialize("UDP", 5000, 8000)
    MainForm = Form1
    MainForm.RootPane.LoadLayout("start") 'Load the layout file.
    MainForm.Show
End Sub
Sub btn_save_port_Action   
    'restart socket with new Port
    UDPSocket1.Close
    UDPSocket1.Initialize("UDP",localport.Text,8000)
End Sub
Sub UDP_PacketArrived (Packet As UDPPacket)
    Dim msg As String
    msg = BytesToString(Packet.Data, Packet.Offset, Packet.Length, "UTF8")
    msgbox.show("Message received: " & msg, "")
End Sub

And here the exeptions thrown when executeing UDPSocket1.Close:

Program started.
java.net.SocketException: socket closed
    at java.net.DualStackPlainDatagramSocketImpl.socketReceiveOrPeekData(Native Method)
    at java.net.DualStackPlainDatagramSocketImpl.receive0(DualStackPlainDatagramSocketImpl.java:121)
    at java.net.AbstractPlainDatagramSocketImpl.receive(AbstractPlainDatagramSocketImpl.java:145)
    at java.net.DatagramSocket.receive(DatagramSocket.java:786)
    at anywheresoftware.b4a.objects.SocketWrapper$UDPSocket$UDPReader.run(SocketWrapper.java:382)
    at java.lang.Thread.run(Thread.java:745)

What i'm doing wrong?

Hans

 

[Erel]

1. It is better to use Log to see the messages.
2. Dim UDPSocket1 again after it is closed.

Does your application crash after this message?

 

[HansDieter]

2. Dim UDPSocket1 again after it is closed.

I'll try, but the problem occurs while closeing the old socket, before trying to do anything else UDP.

Does your application crash after this message?

No, all seems to work as expected, but for the exeption message telling me, something must be wrong.

 

[Erel]

Are you using Network library v1.01?

 

[HansDieter]

Are you using Network library v1.01?

Yes, as it came with B4J 2.0 i just installed

 

[Erel]

Please try it with the attached library (v1.02).

 

[HansDieter]

Please try it with the attached library (v1.02).

Hello Erel,
after some short test all seems to work fine with the new library version with no more exeptions.

Thank you for the quick problem solving.
http://dict.leo.org/ende/index_de.h...oc=0&resultOrder=basic&multiwordShowSingle=on
Hans