B4X

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.

B4X

Dim success As Boolean = False

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

Dim socket As ChilkatSocket
socket.Initialize("socket")

'  Enable session logging:
socket.KeepSessionLog = True
socket.SessionLogEncoding = "esc"

'  To demonstrate session logging, we'll connect to an
'  HTTP server and download the HTTP response header:
Dim ssl As Boolean = False
Dim maxWaitMillisec As Int = 20000
success = socket.Connect("www.chilkatsoft.com", 80, ssl, maxWaitMillisec)
If success <> True Then
    Log(socket.LastErrorText)
    Return
End If


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

'  The socket component includes a BuildHttpGetRequest
'  method for convenience. Build a GET and send it to 
'  the web server:
Dim httpGet As String
httpGet = socket.BuildHttpGetRequest("http://www.chilkatsoft.com/")

'  Send it...
success = socket.SendString(httpGet)
If success <> True Then
    Log(socket.LastErrorText)
    Return
End If


'  Read the response up to the first double CRLF:
Dim httpHeader As String = socket.ReceiveUntilMatch(Chr(13) & Chr(10) & Chr(13) & Chr(10))
If socket.LastMethodSuccess <> True Then
    Log(socket.LastErrorText)
    Return
End If


'  Close the connection with the server
'  Wait a max of 20 seconds (20000 millsec)
success = socket.Close(20000)

'  Display the session log:
Log(socket.SessionLog)

'  Show the HTTP response header:
Log(httpHeader)