Tcl

Send StringBuilder Contents over a Socket

Demonstrates Socket.SendSb, which encodes the contents of a StringBuilder using StringCharset and sends the resulting bytes.

Background. Text send and receive operations encode and decode bytes using the StringCharset property. For plain ASCII or UTF-8 protocols, setting StringCharset to utf-8 is a safe default.

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Tcl


load ./chilkat.dll

set success 0

set socket [new_CkSocket]

#  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.
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
}

#  StringCharset controls the character encoding used when sending and receiving text.
CkSocket_put_StringCharset $socket "utf-8"

#  Build the text to send in a StringBuilder, then send its contents.
set sb [new_CkStringBuilder]

CkStringBuilder_Append $sb "SET temperature 21\r\n"

set success [CkSocket_SendSb $socket $sb]
if {$success == 0} then {
    puts [CkSocket_lastErrorText $socket]
    delete_CkSocket $socket
    delete_CkStringBuilder $sb
    exit
}

puts "Message sent."

delete_CkSocket $socket
delete_CkStringBuilder $sb