Android Question localsocket howto

[ajk]

I need to access localsocket. How to start with this? Working Java code example attached below

import android.net.LocalSocket;
import android.net.LocalSocketAddress;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class ClientSocket {
    public static final String SOCKET_NAME = "com.connect.pc4";
    public static LocalSocket socket=null;
    private InputStream InpStrim;              
    private OutputStream OutStrim;              

    public boolean Connect() {
            try {
                socket = new LocalSocket();
                socket.connect(new LocalSocketAddress(SOCKET_NAME));
                socket.setReceiveBufferSize(327680);
                socket.setSendBufferSize(327680);
                socket.setSoTimeout(1000);
                InpStrim = socket.getInputStream();
                OutStrim = socket.getOutputStream();
            }
            } catch (IOException e) {
                return false;
            }
                return true
    }

    public boolean Disconnect() {
        boolean rc = true;
        try {
            InpStrim.close();
            OutStrim.close();
            socket.close();
        } catch (IOException e) {
            rc = false;
        } catch (Exception e) {
            rc = false;
        }
        return rc;
    }
}

 

[MarcoRome]

Look THIS

 

[ajk]

Thank you: implemented & working

 

[Erel]

Moved to the questions forum. You should use Socket from the Network library.

 

[ajk]

Moved to the questions forum. You should use Socket from the Network library.

But how to connect to LocalSocketAddress using Network library? No port address specified in such case.

Question still important - I have 6 devices to connect with this method (different addresses, different protocols)...

 

[Erel]

Set the Host parameter to "localhost" or "127.0.0.1"

 

[ajk]

ok but I have to connet like in example with different local addresses

public static final String SOCKET_NAME = "com.connect.pc4";
socket.connect(new LocalSocketAddress(SOCKET_NAME));

to "com.connect.pc4", "com.connect.pc5", "com.connect.pc6" and so on on single device

 

[Erel]

I see. It is not a regular network socket. What do you need it for?

 

[ajk]

It's a POS with implemented hardware (drawer, fiscal printer, com ports, scanner & other). I have to establish communication with these devices.

I have made connection with in-lined code. But it seems to me that special library could be useful so simplify connections directly from B4A code.

 

[Erel]

Code to create a local socket:

Sub OpenLocalSocket (LocalSocketName As String) As AsyncStreams
   Dim localsocket As JavaObject
   Dim address As JavaObject
   address.InitializeNewInstance("android.net.LocalSocketAddress", Array(LocalSocketName))
   localsocket.InitializeNewInstance("android.net.LocalSocket", Null)
   localsocket.RunMethod("connect", Array(address))
   Dim astream As AsyncStreams
   astream.Initialize(localsocket.RunMethod("getInputStream", Null), _
     localsocket.RunMethod("getOutputStream", Null), "astream")
   Return astream
End Sub

You will probably need to add some permissions and maybe add the NetworkOnMainThread workaround.

Put this code in a class and create a class instance for each connection.

 

[ajk]

I have bounded in-class created AsyncStream with AStreams with keyboard
like

    AStreams=LOCALsocket.OpenLocalSocket("com.connect.pc6")
    LogColor(AStreams,Colors.DarkGray)

I have
anywheresoftware.b4a.randomaccessfile.AsyncStreams@2d80c3cb

I have AStreams.IsInitialized=True
in log but

but no

AStreams_NewData is fired

AStreams.StreamTotal
AStreams.StreamReceived

are also equal to 0

 

[Erel]

AStreams.StreamTotal
AStreams.StreamReceived

These properties are only relevant when you call WriteStream.

The event name set in my code is astream not astreams.

 

[ajk]

Yes I see but is returned as AsyncStreams?
I think You suggest to use it in AsyncStreamsObject code like structure?

 

[Erel]

I think You suggest to use it in AsyncStreamsObject code like structure?

No. (You should never use AsyncStreamsObject as it was replaced by B4XSerializator)

Yes I see but is returned as AsyncStreams?

True. If you go over the code you will see that I set the event name to astream. So you need to write:

Sub astream_NewData(Buffer() As Byte)

 

[ajk]

OK ready - working
I have used code from #10 post to get localsocket and then

Sub AStream_NewData (Buffer() As Byte)  'KBD
    '    LogColor("xxx",Colors.Blue)
    CallSub2(Main, "KbdNewData", Buffer)
End Sub

Thank You for help