Socket Connection

pablovidal · Dec 2, 2012

Hello,
B4A is an extraordinary tool, but lacks examples, This, because not as sockets connections implement the examples I've seen and nothing. Basically what I need is a working example for sending and receiving from an Android device to a server socket that I have currently working with other tools. thanks

mc73 · Dec 2, 2012

Checked this?

pablovidal · Dec 2, 2012

Thanks for the info, but this example does not work,

mc73 · Dec 2, 2012

pablovidal said:
Thanks for the info, but this example does not work,

I've tried it in the past and it worked. Perhaps you mean that it doesn't help?

pablovidal · Dec 2, 2012

Really, speaking, this example does nothing, I have everything connected to the socket, but when these fail data sent to the server.

B4X:

Sub oSocket_Connected(Connected As Boolean)As Boolean 
    If Connected = True Then
     ToastMessageShow("Conectado",True)
     oAStreams.Initialize(oSocket.InputStream,oSocket.OutputStream,"oAstreams")
    Else
     ToastMessageShow("Servidor no disponible",True)
    End If
    
End Sub


Sub SendtoSocket( cOp As String, cTrama As String )

Dim cString As String
 
 cString = "#INI|20121202~"& CRLF
 
 If oAStreams.IsInitialized = False Then Return

    If cString.Length > 0 Then
     Dim buffer() As Byte
     buffer = cString.GetBytes( "UTF8" ) 
     oAStreams.Write( buffer )  ' Aqui no envia el buffer / no send buffers
     ToastMessageShow( cString, True )     
    End If
 
End Sub

Erel · Dec 2, 2012

Can you post the server code? Does it expect a Windows end of line? If yes then you should send chr(13) & chr(10) instead of CRLF.

Kevin · Dec 2, 2012

Erel said:
Can you post the server code? Does it expect a Windows end of line? If yes then you should send chr(13) & chr(10) instead of CRLF.

What exactly is the difference between CRLF and Chr(13) & Chr(10)? I meant to post an FYI thread and never did, but not too long ago I spent probably a good 16 hours over the course of several days trying to figure out why several lines of post headers and XML data sent to a raw socket was not working despite every other bit of sample code floating around on the web saying I had it right. By dumb luck I discovered that I needed to terminate each line with Chr(13) & Chr(10), not CRLF as I was doing. :BangHead:

mc73 · Dec 2, 2012

Kevin said:
What exactly is the difference between CRLF and Chr(13) & Chr(10)? I meant to post an FYI thread and never did, but not too long ago I spent probably a good 16 hours over the course of several days trying to figure out why several lines of post headers and XML data sent to a raw socket was not working despite every other bit of sample code floating around on the web saying I had it right. By dumb luck I discovered that I needed to terminate each line with Chr(13) & Chr(10), not CRLF as I was doing. :BangHead:

I think crlf.length and asc(crlf) will give a short answer I didn't know exactly, assuming that it was identical to chr(13) & chr(10).

pablovidal · Dec 3, 2012

Many thanks for the help, that was the problem, so simple , I still work

Kevin · Dec 3, 2012

mc73 said:
I think crlf.length and asc(crlf) will give a short answer I didn't know exactly, assuming that it was identical to chr(13) & chr(10).

That's why it took me so long to try it, because I thought they were the same thing, but certainly not when sending data to sockets. I still can't believe how much time I wasted on such a silly thing.

Erel · Dec 3, 2012

Note that you can see it in the online docs:
Basic4android Search: crlf

Socket Connection

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