Tcl

Receive a 32-bit Integer from a Socket

Demonstrates Socket.ReceiveInt32, which reads exactly four bytes as a signed 32-bit integer and stores the result in the ReceivedInt property. Byte order is 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.

Chilkat Tcl Downloads

Download Chilkat for Tcl

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
}

#  Read exactly four bytes as a signed 32-bit integer and store the result in the ReceivedInt
#  property.  The argument selects byte order (1 = big-endian, network byte order).
set bBigEndian 1
set success [CkSocket_ReceiveInt32 $socket $bBigEndian]
if {$success == 0} then {
    puts [CkSocket_lastErrorText $socket]
    delete_CkSocket $socket
    exit
}

puts "Received 32-bit integer: [CkSocket_get_ReceivedInt $socket]"

delete_CkSocket $socket