Lianja

Receive Text from a Socket into a StringBuilder

Demonstrates Socket.ReceiveSb, which receives text, decodes it using StringCharset, and appends it to a StringBuilder.

Background. Text send and receive operations encode and decode bytes using the StringCharset property. For plain ASCII or UTF-8 protocols, setting StringCharset to utf-8 is a safe default.

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llSuccess = .F.

loSocket = createobject("CkSocket")

//  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.
llBTls = .T.
lnMaxWaitMs = 5000
llSuccess = loSocket.Connect("example.com",5000,llBTls,lnMaxWaitMs)
if (llSuccess = .F.) then
    ? loSocket.LastErrorText
    release loSocket
    return
endif

//  StringCharset controls the character encoding used when sending and receiving text.
loSocket.StringCharset = "utf-8"
//  Send a request using a simple application-defined text protocol in which each message ends with a
//  CRLF.
lcCommand = "STATUS" + Chr(13) + Chr(10)
llSuccess = loSocket.SendString(lcCommand)
if (llSuccess = .F.) then
    ? loSocket.LastErrorText
    release loSocket
    return
endif

//  Receive text and append it to a StringBuilder, decoding using StringCharset.
loSb = createobject("CkStringBuilder")
llSuccess = loSocket.ReceiveSb(loSb)
if (llSuccess = .F.) then
    ? loSocket.LastErrorText
    release loSocket
    release loSb
    return
endif

lcResponseText = loSb.GetAsString()
if (loSb.LastMethodSuccess = .F.) then
    ? loSb.LastErrorText
    release loSocket
    release loSb
    return
endif

? lcResponseText


release loSocket
release loSb