(VB.NET) 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 = 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.

Download: Chilkat .NET Assemblies

Dim socket As New Chilkat.Socket()

Dim success As Boolean
success = socket.UnlockComponent("Anything for 30-day trial")
If (success <> true) Then
    TextBox1.Text = TextBox1.Text & socket.LastErrorText & vbCrLf
    Exit Sub
End If


'  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
ssl = false
Dim maxWaitMillisec As Long
maxWaitMillisec = 20000
success = socket.Connect("www.chilkatsoft.com",80,ssl,maxWaitMillisec)
If (success <> true) Then
    TextBox1.Text = TextBox1.Text & socket.LastErrorText & vbCrLf
    Exit Sub
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
    TextBox1.Text = TextBox1.Text & socket.LastErrorText & vbCrLf
    Exit Sub
End If


'  Read the response up to the first double CRLF:
Dim httpHeader As String
httpHeader = socket.ReceiveUntilMatch("\r\n\r\n")
If (httpHeader = vbNullString ) Then
    TextBox1.Text = TextBox1.Text & socket.LastErrorText & vbCrLf
    Exit Sub
End If


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

'  Display the session log:
TextBox1.Text = TextBox1.Text & socket.SessionLog & vbCrLf

'  Show the HTTP response header:
TextBox1.Text = TextBox1.Text & httpHeader & vbCrLf