Lianja

Receive an Exact Number of Bytes into a BinData

Demonstrates Socket.ReceiveBdN, which receives exactly the requested number of bytes and appends them to a BinData, continuing until the full count is satisfied.

Background. Inactivity is controlled by MaxReadIdleMs: the call fails if incoming bytes halt for longer than MaxReadIdleMs milliseconds before the full amount is received. A single receive returns only what is currently available, whereas this counted receive waits for an exact number of bytes.

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llSuccess = .F.

loSocket = createobject("CkSocket")

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

//  MaxReadIdleMs controls the inactivity limit for receiving.  The ReceiveBdN call will fail if
//  incoming bytes halt for longer than this many milliseconds before the full amount is received.
loSocket.MaxReadIdleMs = 15000

//  Receive exactly the requested number of bytes, appending them to a BinData.  The method continues
//  receiving until the full count is satisfied or a failure occurs.
loBd = createobject("CkBinData")
llSuccess = loSocket.ReceiveBdN(256,loBd)
if (llSuccess = .F.) then
    ? loSocket.LastErrorText
    release loSocket
    release loBd
    return
endif

? "Received " + str(loBd.NumBytes) + " bytes."


release loSocket
release loBd