Visual FoxPro

Receive a Bounded String from a Socket

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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Visual FoxPro

LOCAL lnSuccess
LOCAL loSocket
LOCAL lnBTls
LOCAL lnMaxWaitMs
LOCAL lcCommand
LOCAL lcFirstChunk

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 and decode text like ReceiveString, but read at most the given number of input bytes.
*  The limit is measured in bytes, not Unicode characters.
lcFirstChunk = loSocket.ReceiveStringMaxN(64)
IF (loSocket.LastMethodSuccess = 0) THEN
    ? loSocket.LastErrorText
    RELEASE loSocket
    CANCEL
ENDIF

? lcFirstChunk

RELEASE loSocket