(Objective-C) 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 = YES. 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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#import <CkoSocket.h>
#import <CkoBinData.h>
#import <NSString.h>

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

CkoSocket *socket = [[CkoSocket alloc] init];

// Enable session logging:
socket.KeepSessionLog = YES;
socket.SessionLogEncoding = @"esc";

BOOL tls = YES;
int maxWaitMillisec = 20000;
BOOL success = [socket Connect: @"www.chilkatsoft.com" port: [NSNumber numberWithInt: 443] ssl: tls maxWaitMs: [NSNumber numberWithInt: maxWaitMillisec]];
if (success != YES) {
    NSLog(@"%@",socket.LastErrorText);
    return;
}

// Send a GET start line to the web server..
success = [socket SendString: @"GET /abc123.abc123 HTTP/1.1\r\n"];
if (success != YES) {
    NSLog(@"%@",socket.LastErrorText);
    return;
}

// Send some bytes that will cause an error...
CkoBinData *binData = [[CkoBinData alloc] init];
[binData AppendEncoded: @"01020304" encoding: @"hex"];
success = [socket SendBd: binData];

// Read the response up to the first double CRLF:
NSString *httpHeader = [socket ReceiveUntilMatch: @"\r\n\r\n"];
if (socket.LastMethodSuccess != YES) {
    NSLog(@"%@",socket.LastErrorText);
    return;
}

// Close the connection with the server
// Wait a max of 20 seconds (20000 millsec)
[socket Close: [NSNumber numberWithInt: 20000]];

// Display the session log:
NSLog(@"%@",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
//