VB.NET
VB.NET
Demonstrates KeepSessionLog and SessionLog
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/TLS 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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Dim success As Boolean = False
' This example assumes the Chilkat Socket API to have been previously unlocked.
' See Socket Unlock Sample for sample code.
Dim socket As New Chilkat.Socket
' Enable session logging:
socket.KeepSessionLog = True
socket.SessionLogEncoding = "esc"
Dim tls As Boolean = True
Dim maxWaitMillisec As Integer = 20000
success = socket.Connect("www.chilkatsoft.com",443,tls,maxWaitMillisec)
If (success <> True) Then
Debug.WriteLine(socket.LastErrorText)
Exit Sub
End If
' Send a GET start line to the web server..
success = socket.SendString("GET /abc123.abc123 HTTP/1.1" & vbCrLf)
If (success <> True) Then
Debug.WriteLine(socket.LastErrorText)
Exit Sub
End If
' Send some bytes that will cause an error...
Dim binData As New Chilkat.BinData
binData.AppendEncoded("01020304","hex")
success = socket.SendBd(binData)
' Read the response up to the first double CRLF:
Dim httpHeader As String = socket.ReceiveUntilMatch(vbCrLf & vbCrLf)
If (socket.LastMethodSuccess <> True) Then
Debug.WriteLine(socket.LastErrorText)
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:
Debug.WriteLine(socket.SessionLog)
' The Session log will show the exact bytes sent and received.
' In this case, the session log shows:
' SendString: GET\x20/abc123.abc123\x20HTTP/1.1\r\n
'
' SendBytes: \x01\x02\x03\x04
' ReceiveUntilMatch: HTTP/1.1\x20400\x20Bad\x20Request\r\n
' Content-Type:\x20text/html;\x20charset=us-ascii\r\n
' Server:\x20Microsoft-HTTPAPI/2.0\r\n
' Date:\x20Thu,\x2027\x20Oct\x202016\x2013:16:02\x20GMT\r\n
' Connection:\x20close\r\n
' Content-Length:\x20339\r\n
' \r\n
' <!DOCTYPE\x20HTML\x20PUBLIC\x20\"-//W3C//DTD\x20HTML\x204.01//EN\"\"http://www.w
' 3.org/TR/html4/strict.dtd\">\r\n
' <HTML><HEAD><TITLE>Bad\x20Request</TITLE>\r\n
' <META\x20HTTP-EQUIV=\"Content-Type\"\x20Content=\"text/html;\x20charset=us-ascii
' \"></HEAD>\r\n
' <BODY><h2>Bad\x20Request\x20-\x20Invalid\x20Header</h2>\r\n
' <hr><p>HTTP\x20Error\x20400.\x20The\x20request\x20has\x20an\x20invalid\x20header
' \x20name.</p>\r\n
' </BODY></HTML>\r\n
'