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B4X

Receive Text up to a Delimiter Byte

See more Socket/SSL/TLS Examples

Demonstrates Socket.ReceiveStringUntilByte, which receives bytes until a specific raw byte value is found, then decodes the preceding bytes using StringCharset. The delimiter is excluded from the returned string.

Background. The delimiter search is purely byte-oriented and does not recognize character boundaries. A common delimiter is the linefeed byte (decimal 10).

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B4X
Dim success As Boolean = False

Dim socket As ChilkatSocket
socket.Initialize("socket")

'  Connect to the server using TLS.  The 3rd argument enables the TLS handshake after the TCP
'  connection succeeds; the 4th is the maximum time to wait, in milliseconds.
Dim bTls As Boolean = True
Dim maxWaitMs As Int = 5000
success = socket.Connect("example.com", 5000, bTls, maxWaitMs)
If success = False Then
    Log(socket.LastErrorText)
    Return
End If


'  StringCharset controls the character encoding used when sending and receiving text.
socket.StringCharset = "utf-8"
'  Send a request using a simple application-defined text protocol in which each message ends with a
'  CRLF.
Dim command As String = "STATUS" & Chr(13) & Chr(10)
success = socket.SendString(command)
If success = False Then
    Log(socket.LastErrorText)
    Return
End If


'  Receive bytes until a specific raw byte value is found, then decode the preceding bytes using
'  StringCharset.  The delimiter itself is excluded from the returned string.  Here the delimiter is
'  the linefeed byte (decimal 10).
Dim line As String = socket.ReceiveStringUntilByte(10)
If socket.LastMethodSuccess = False Then
    Log(socket.LastErrorText)
    Return
End If

Log(line)