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B4X

Receive a Bounded String from a Socket

See more Socket/SSL/TLS Examples

Demonstrates Socket.ReceiveStringMaxN, which receives and decodes text like ReceiveString but reads at most a given number of input bytes.

Background. The limit is measured in bytes, not Unicode characters, so a byte limit can split a multibyte character or a protocol token. Decoding uses StringCharset.

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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 and decode text like ReceiveString, but read at most the given number of input bytes.
'  The limit is measured in bytes, not Unicode characters.
Dim firstChunk As String = socket.ReceiveStringMaxN(64)
If socket.LastMethodSuccess = False Then
    Log(socket.LastErrorText)
    Return
End If

Log(firstChunk)