Construct a webpage download server in the. NET Environment (2)

Iii. Introduction to the web download server instance:

Finally, I will show you a good example based on the above. NET network programming knowledge. This instance is a client application using Socket based on synchronization mode. It first establishes an end point by parsing the Server IP address and creates a Socket connection based on Streaming Socket, the protocol used is TCP. Through this Socket, you can send the command to get the web page, use this Socket to get the default web page on the server, and write the obtained data to the local file through the file stream. In this way, the web page download is completed. The program running effect is as follows:



The program code is as follows:

Using System;
Using System. Drawing;
Using System. Collections;
Using System. ComponentModel;
Using System. Windows. Forms;
Using System. Data;
Using System. Net;
Using System. Net. Sockets;
Using System. Text;
Using System. IO;

Namespace SocketSample
{
///

/// Summary of Form1.
///

Public class Form1: System. Windows. Forms. Form
{
Private System. Windows. Forms. Label label1;
Private System. Windows. Forms. Label label2;
Private System. Windows. Forms. Button Download;
Private System. Windows. Forms. TextBox ServerAddress;
Private System. Windows. Forms. TextBox Filename;
///
/// Required designer variables.
///
Private System. ComponentModel. Container
Components = null;
Public Form1 ()
{
//
// Required for Windows Form Designer support
//
InitializeComponent ();

//
// TODO: In InitializeComponent
// Add Any constructor code after the call
}

///
/// Clear all resources in use.
///
Protected override void Dispose (bool disposing)
{
If (disposing)
{
If (components! = Null)
{
Components. Dispose ();
}
}
Base. Dispose (disposing );
}

# Region Windows Form Designer generated code
///
/// The designer supports the required methods-do not use the code editor to modify
/// Content of this method.
///
Private void InitializeComponent ()
{
This. label1 = new System. Windows.
Forms. Label ();
This. label2 = new System. Windows.
Forms. Label ();
This. Download = new System. Windows.
Forms. Button ();
This. ServerAddress = new System. Windows.
Forms. TextBox ();
This. Filename = new System. Windows.
Forms. TextBox ();
This. SuspendLayout ();
//
// Label1
//
This. label1.Location = new System. Drawing.
Point (16, 24 );
This. label1.Name = "label1 ";
This. label1.Size = new System. Drawing.
Size (80, 23 );
This. label1.TabIndex = 0;
This. label1.Text = "server address :";
This. label1.TextAlign = System. Drawing.
ContentAlignment. MiddleRight;
//
// Label2
//
This. label2.Location = new System. Drawing.
Point (16, 64 );
This. label2.Name = "label2 ";
This. label2.Size = new System. Drawing.
Size (80, 23 );
This. label2.TabIndex = 1;
This. label2.Text = "local file name :";
This. label2.TextAlign = System. Drawing.
ContentAlignment. MiddleRight;
//
// Download
//
This. Download. Location = new System.
Drawing. Point (288, 24 );
This. Download. Name = "Download ";
This. Download. TabIndex = 2;
This. Download. Text = "Start Download ";
This. Download. Click + = new System.
EventHandler (this. Download_Click );
//
// ServerAddress
//
This. ServerAddress. Location = new System.
Drawing. Point (96, 24 );
This. ServerAddress. Name = "ServerAddress ";
This. ServerAddress. Size = new System.
Drawing. Size (176, 21 );
This. ServerAddress. TabIndex = 3;
This. ServerAddress. Text = "";
//
// Filename

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