Tcl

Receive Bytes into a BinData

Demonstrates Socket.ReceiveBd, which receives one delivery of binary data and appends it to a BinData. It returns whatever is immediately available.

Background. The BinData receive methods accumulate raw bytes in a BinData object. A single receive returns only what is currently available, whereas the counted receive waits for an exact number of bytes.

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Tcl


load ./chilkat.dll

set success 0

set socket [new_CkSocket]

#  Connect to the server using TLS.
set bTls 1
set maxWaitMs 5000
set success [CkSocket_Connect $socket "example.com" 5000 $bTls $maxWaitMs]
if {$success == 0} then {
    puts [CkSocket_lastErrorText $socket]
    delete_CkSocket $socket
    exit
}

#  Receive one delivery of binary data and append it to a BinData.  ReceiveBd returns whatever is
#  immediately available; it does not loop to drain everything that may follow.
set bd [new_CkBinData]

set success [CkSocket_ReceiveBd $socket $bd]
if {$success == 0} then {
    puts [CkSocket_lastErrorText $socket]
    delete_CkSocket $socket
    delete_CkBinData $bd
    exit
}

puts "Received [CkBinData_get_NumBytes $bd] bytes."

delete_CkSocket $socket
delete_CkBinData $bd