Visual FoxPro

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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Visual FoxPro

LOCAL lnSuccess
LOCAL loSocket
LOCAL lnBTls
LOCAL lnMaxWaitMs
LOCAL lcCommand
LOCAL lcResponse

lnSuccess = 0

loSocket = CreateObject('Chilkat.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.
lnBTls = 1
lnMaxWaitMs = 5000
lnSuccess = loSocket.Connect("example.com",5000,lnBTls,lnMaxWaitMs)
IF (lnSuccess = 0) THEN
    ? loSocket.LastErrorText
    RELEASE loSocket
    CANCEL
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)
lnSuccess = loSocket.SendString(lcCommand)
IF (lnSuccess = 0) THEN
    ? loSocket.LastErrorText
    RELEASE loSocket
    CANCEL
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 = 0) THEN
    ? loSocket.LastErrorText
    RELEASE loSocket
    CANCEL
ENDIF

? lcResponse

RELEASE loSocket