Visual FoxPro

Receive a 16-bit Integer from a Socket

Demonstrates Socket.ReceiveInt16, which reads exactly two bytes as a 16-bit integer and stores the result in the ReceivedInt property. Byte order and signedness are selectable.

Background. Fixed-size integers and length prefixes are common building blocks for application-defined binary protocols. Byte order is selectable, with big-endian being network byte order.

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Visual FoxPro

LOCAL lnSuccess
LOCAL loSocket
LOCAL lnBTls
LOCAL lnMaxWaitMs
LOCAL lnBBigEndian
LOCAL lnBUnsigned

lnSuccess = 0

loSocket = CreateObject('Chilkat.Socket')

*  Connect to the server using TLS.
lnBTls = 1
lnMaxWaitMs = 5000
lnSuccess = loSocket.Connect("example.com",5000,lnBTls,lnMaxWaitMs)
IF (lnSuccess = 0) THEN
    ? loSocket.LastErrorText
    RELEASE loSocket
    CANCEL
ENDIF

*  Read exactly two bytes as a 16-bit integer and store the result in the ReceivedInt property.
*  The 1st argument selects byte order (1 = big-endian); the 2nd selects unsigned interpretation.
lnBBigEndian = 1
lnBUnsigned = 0
lnSuccess = loSocket.ReceiveInt16(lnBBigEndian,lnBUnsigned)
IF (lnSuccess = 0) THEN
    ? loSocket.LastErrorText
    RELEASE loSocket
    CANCEL
ENDIF

? "Received 16-bit integer: " + STR(loSocket.ReceivedInt)

RELEASE loSocket