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Debugging with Socket Session Logging

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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 = _TRUE_. 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.

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llSuccess = .F.

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

loSocket = createobject("CkSocket")

// Enable session logging:
loSocket.KeepSessionLog = .T.
loSocket.SessionLogEncoding = "esc"

// To demonstrate session logging, we'll connect to an
// HTTP server and download the HTTP response header:
llSsl = .F.
lnMaxWaitMillisec = 20000
llSuccess = loSocket.Connect("www.chilkatsoft.com",80,llSsl,lnMaxWaitMillisec)
if (llSuccess <> .T.) then
    ? loSocket.LastErrorText
    release loSocket
    return
endif

// Set maximum timeouts for reading an writing (in millisec)
loSocket.MaxReadIdleMs = 10000
loSocket.MaxSendIdleMs = 10000

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

lcHttpGet = loSocket.BuildHttpGetRequest("http://www.chilkatsoft.com/")

// Send it...
llSuccess = loSocket.SendString(lcHttpGet)
if (llSuccess <> .T.) then
    ? loSocket.LastErrorText
    release loSocket
    return
endif

// Read the response up to the first double CRLF:
lcHttpHeader = loSocket.ReceiveUntilMatch(Chr(13) + Chr(10) + Chr(13) + Chr(10))
if (loSocket.LastMethodSuccess <> .T.) then
    ? loSocket.LastErrorText
    release loSocket
    return
endif

// Close the connection with the server
// Wait a max of 20 seconds (20000 millsec)
llSuccess = loSocket.Close(20000)

// Display the session log:
? loSocket.SessionLog

// Show the HTTP response header:
? lcHttpHeader


release loSocket