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B4X

Receive a Line Terminated by CRLF

See more Socket/SSL/TLS Examples

Demonstrates Socket.ReceiveToCRLF, which receives text through a CRLF line terminator and returns the text including the terminator.

Background. Chilkat encodes CR followed by LF using StringCharset and searches the incoming byte stream for that exact sequence. This is convenient for line-oriented text protocols.

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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 text through a CRLF line terminator, returning the text including the terminator.  This is
'  convenient for line-oriented text protocols in which each response is a CRLF-terminated line.
Dim responseLine As String = socket.ReceiveToCRLF
If socket.LastMethodSuccess = False Then
    Log(socket.LastErrorText)
    Return
End If

Log(responseLine)