Lianja

Receive Text up to a Matching Sequence

Demonstrates Socket.ReceiveUntilMatch, which receives bytes until an exact byte sequence is found. The match string is encoded using StringCharset and compared byte-for-byte.

Background. The comparison is case-sensitive with no Unicode normalization. This is useful for reading a message that ends with an application-defined marker delimiting the end of a response.

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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 bytes until an exact byte sequence is found.  The match string is encoded using
//  StringCharset and compared byte-for-byte.  Here the server marks the end of its response with an
//  application-defined marker.
lcResponse = loSocket.ReceiveUntilMatch("<EOM>")
if (loSocket.LastMethodSuccess = .F.) then
    ? loSocket.LastErrorText
    release loSocket
    return
endif

? lcResponse


release loSocket