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Tcl Examples

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(Tcl) Debugging with Socket Session Logging

Debugging with socket session logging.

The Chilkat Socket component provides properties for keeping a session log making it possible to see the exact bytes received and sent on a TCP/IP or SSL connection. To enable session logging, set the KeepSessionLog property = 1. The SessionLogEncoding property controls how binary, non-printable bytes are represented in the log. There are two possible settings: Possible values are "esc" and "hex". The default value is "esc".

When set to "hex", the bytes are encoded as a hexidecimalized string. The "esc" encoding is a C-string like encoding, and is more compact than hex if most of the data to be logged is text. Printable us-ascii chars are unmodified. Common "C" control chars are represented as "\r", "\n", "\t", etc. Non-printable and byte values greater than 0x80 are escaped using a backslash and hex encoding: \xHH. Certain printable chars are backslashed: SPACE, double-quote, single-quote, etc.

Chilkat Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

set socket [new_CkSocket]

# Enable session logging:
CkSocket_put_KeepSessionLog $socket 1
CkSocket_put_SessionLogEncoding $socket "esc"

# To demonstrate session logging, we'll connect to an
# HTTP server and download the HTTP response header:
set ssl 0
set maxWaitMillisec 20000
set success [CkSocket_Connect $socket "www.chilkatsoft.com" 80 $ssl $maxWaitMillisec]
if {[expr $success != 1]} then {
    puts [CkSocket_lastErrorText $socket]
    delete_CkSocket $socket
    exit
}

# Set maximum timeouts for reading an writing (in millisec)
CkSocket_put_MaxReadIdleMs $socket 10000
CkSocket_put_MaxSendIdleMs $socket 10000

# The socket component includes a BuildHttpGetRequest
# method for convenience. Build a GET and send it to 
# the web server:

set httpGet [CkSocket_buildHttpGetRequest $socket "http://www.chilkatsoft.com/"]

# Send it...
set success [CkSocket_SendString $socket $httpGet]
if {[expr $success != 1]} then {
    puts [CkSocket_lastErrorText $socket]
    delete_CkSocket $socket
    exit
}

# Read the response up to the first double CRLF:
set httpHeader [CkSocket_receiveUntilMatch $socket "\r\n\r\n"]
if {[expr [CkSocket_get_LastMethodSuccess $socket] != 1]} then {
    puts [CkSocket_lastErrorText $socket]
    delete_CkSocket $socket
    exit
}

# Close the connection with the server
# Wait a max of 20 seconds (20000 millsec)
set success [CkSocket_Close $socket 20000]

# Display the session log:
puts [CkSocket_sessionLog $socket]

# Show the HTTP response header:
puts "$httpHeader"

delete_CkSocket $socket

 

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