Let us dive into the code...
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// MyWebServer Written by Imtiaz Alam
namespace Imtiaz
{
using System;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading ;
class MyWebServer
{
private TcpListener myListener ;
private int port = 5050 ; // Select any free port
you wish
//The constructor which make the TcpListener start listening
on the
//given port. It also calls a Thread on the method StartListen().
public MyWebServer()
{
try
{
//start
listing on the given port
myListener
= new TcpListener(port) ;
myListener.Start();
Console.WriteLine("Web
Server Running... Press ^C to Stop...");
//start
the thread which calls the method 'StartListen'
Thread
th = new Thread(new ThreadStart(StartListen));
th.Start()
;
}
catch(Exception e)
{
Console.WriteLine("An
Exception Occurred while Listening :" +e.ToString());
}
}
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We defined namespace, included the references required in our application and
initialized the port in the constructor, started the listener and created a new
thread and called startlisten function.
Now let us assume that the user does not supplies the file name, in that case
we have to identify the default filename and send to the browser, as in IIS we
define the default document under documents tab.
We have already stored the default file name in the default.dat and stored
in the data directory. The GetTheDefaultFileName function takes the directory
path as input, open the default.dat file and looks for the file in the directory
provided and returns the file name or blank depends on the situation.
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public string GetTheDefaultFileName(string sLocalDirectory)
{
StreamReader sr;
String sLine = "";
try
{
//Open the default.dat to find
out the list
// of default file
sr = new StreamReader("data\\Default.Dat");
while ((sLine = sr.ReadLine())
!= null)
{
//Look
for the default file in the web server root folder
if (File.Exists(
sLocalDirectory + sLine) == true)
break;
}
}
catch(Exception e)
{
Console.WriteLine("An Exception
Occurred : " + e.ToString());
}
if (File.Exists( sLocalDirectory + sLine) == true)
return sLine;
else
return "";
}
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We also need to resolve the virtual directory to the actual physical directory
like we do in IIS. We have already stored the mapping between the Actual and
Virtual directory in Vdir.Dat. Remember in all the cases the file format is very
important.
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public string GetLocalPath(string sMyWebServerRoot, string sDirName)
{
StreamReader sr;
String sLine = "";
String sVirtualDir = "";
String sRealDir = "";
int iStartPos = 0;
//Remove extra spaces
sDirName.Trim();
// Convert to lowercase
sMyWebServerRoot = sMyWebServerRoot.ToLower();
// Convert to lowercase
sDirName = sDirName.ToLower();
try
{
//Open the Vdirs.dat to find out
the list virtual directories
sr = new StreamReader("data\\VDirs.Dat");
while ((sLine = sr.ReadLine())
!= null)
{
//Remove
extra Spaces
sLine.Trim();
if (sLine.Length
> 0)
{
//find the separator
iStartPos = sLine.IndexOf(";");
// Convert to lowercase
sLine = sLine.ToLower();
sVirtualDir = sLine.Substring(0,iStartPos);
sRealDir = sLine.Substring(iStartPos + 1);
if (sVirtualDir == sDirName)
{
break;
}
}
}
}
catch(Exception e)
{
Console.WriteLine("An Exception
Occurred : " + e.ToString());
}
if (sVirtualDir == sDirName)
return sRealDir;
else
return "";
}
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