barcode generator in asp.net code project Use an Uri object to set the address of page. in VS .NET

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Use an Uri object to set the address of page.
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Dim uri As New Uri( http://localhost/cookies.asp )
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Dim httpReq As HttpWebRequest = DirectCast(WebRequest.Create(uri), HttpWebRequest)
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Prepare to receive cookies.
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httpReq.CookieContainer = New CookieContainer
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Read the page.
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Dim httpRes As HttpWebResponse = DirectCast(httpReq.GetResponse, HttpWebResponse)
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Display cookies received from page (optional). For Each coo As Cookie In httpRes.Cookies Console.WriteLine( COOKIE {0} = {1}", coo.Name, coo.Value) Next Process the page here.
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Make another request to same page (or another page from same site)
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httpReq = DirectCast(WebRequest.Create(uri), HttpWebRequest)
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httpReq.CookieContainer = New CookieContainer
Reuse cookies received from last response.
For Each coo As Cookie In httpRes.Cookies
httpReq.CookieContainer.Add(coo) Next Read the page again. httpRes = DirectCast(httpReq.GetResponse, HttpWebResponse) (and so on...)
Using cookie containers in this fashion is similar to what you do to support cookies and ASP.NET sessions when working with Web services, as I explained in 29.
Working with the TCP Protocol
Data transferred over the Internet doesn t have to be HTML or XML, and a Web server can and usually does offer more services than just serving HTML pages. In this section,
34:
Programming for the Internet
you ll see how you can have two machines communicate through the Transmission Control Protocol (TCP) using the System.Net.Sockets.TcpClient class. The Sys tem.Net.Sockets namespace also contains the UdpClient class (for working with the User Datagram Protocol, or UDP) and the Socket class (for working directly with socket services). I won t cover these classes here, but you can find several examples in the MSDN documentation. You can have two applications on the same or different machines communicate through TCP. This protocol ensures that data is either correctly received or an excep tion is thrown, and for this reason it is the preferred protocol when you can t afford to lose data. You can apply these techniques to programs running on the same LAN or the same machine as a simple alternative to other communication techniques, such as remoting. The TCP protocol assumes you have a server application that listens to requests com ing from clients. Writing the client application is simpler, so I ll begin there. The client code must instantiate a TcpClient object that references the server application by means of the server application s URL and port number. (The port number should be in the range of 1024 to 65535.) Next, the client invokes the TcpClient.GetStream method to retrieve the NetworkStream object that can be used to send and receive data from the server. It s obvious that the client and the server application must agree on the port number as well as the format of the data being sent over the wire. In the following example, I ll use the simple rule that the client sends and receives a string terminated with a CR-LF character so that I can perform the actual write and read operations by means of the StreamWriter and StreamReader objects:
This code assumes a server on local machine is listening to port 2048.
Dim tcpCli As New TcpClient( localhost", 2048)
Retrieve the stream that can send and receive data.
Dim ns As NetworkStream = tcpCli.GetStream
Send a CR-LF-termined string to the server.
Dim sw As New StreamWriter(ns)
sw.WriteLine(txtSendData.Text)
sw.Flush() This is VERY important!
Receive data from the server application and display it.
Dim sr As New StreamReader(ns)
Dim result As String = sr.ReadLine()
Console.WriteLine(result)
Release resources.
sr.Close()
sw.Close()
ns.Close()
The server application must create a TcpListener object that listens to a given port and accepts incoming requests from clients. The AcceptTcpClient method waits until a con nection is made and returns the TcpClient object that represents the client making the
Part VII:
Advanced Topics
request. The GetStream method of this TcpClient object returns a NetworkStream that the server application can use to read data from clients and send them a result.
Dim listening As Boolean = False Sub ListenToClients() Listen to port 2048. Dim localhostAddress As IPAddress = IPAddress.Loopback Dim tcpList As New TcpListener(localhostAddress, 2048) tcpList.Start() listening = True Do Wait for the next client to make a request. Dim tcpCli As TcpClient = tcpList.AcceptTcpClient() Read data sent by the client (a CR-LF separated string in this case). Dim ns As NetworkStream = tcpCli.GetStream Dim sr As New StreamReader(ns) Dim receivedData As String = sr.ReadLine() Process the data (just convert to upper case in this demo).
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