Visual FoxPro

Debugging with Socket Session Logging

See more Socket/SSL/TLS Examples

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.

Visual FoxPro

LOCAL lnSuccess
LOCAL loSocket
LOCAL lnSsl
LOCAL lnMaxWaitMillisec
LOCAL lcHttpGet
LOCAL lcHttpHeader

lnSuccess = 0

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

loSocket = CreateObject('Chilkat.Socket')

* Enable session logging:
loSocket.KeepSessionLog = 1
loSocket.SessionLogEncoding = "esc"

* To demonstrate session logging, we'll connect to an
* HTTP server and download the HTTP response header:
lnSsl = 0
lnMaxWaitMillisec = 20000
lnSuccess = loSocket.Connect("www.chilkatsoft.com",80,lnSsl,lnMaxWaitMillisec)
IF (lnSuccess <> 1) THEN
    ? loSocket.LastErrorText
    RELEASE loSocket
    CANCEL
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...
lnSuccess = loSocket.SendString(lcHttpGet)
IF (lnSuccess <> 1) THEN
    ? loSocket.LastErrorText
    RELEASE loSocket
    CANCEL
ENDIF

* Read the response up to the first double CRLF:
lcHttpHeader = loSocket.ReceiveUntilMatch(CHR(13) + CHR(10) + CHR(13) + CHR(10))
IF (loSocket.LastMethodSuccess <> 1) THEN
    ? loSocket.LastErrorText
    RELEASE loSocket
    CANCEL
ENDIF

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

* Display the session log:
? loSocket.SessionLog

* Show the HTTP response header:
? lcHttpHeader

RELEASE loSocket