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使用C#与NNTP服务器交互!

王朝c#·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

using System;

using System.Text;

using System.Net;

using System.IO;

using System.Net.Sockets;

using System.Collections;

using System.Diagnostics;

namespace NntpTools {

/// <summary>

/// Class1 的摘要说明。

/// </summary>

class Debug {

/// <summary>

/// 应用程序的主入口点。

/// </summary>

[STAThread]

static void Main(string[] args) {

NNTPClass nc=new NNTPClass();

nc.Connect("msnews.microsoft.com");

ArrayList grouplist=nc.GetNewsgroups();

for(int i=0;i<grouplist.Count;i++){

Console.WriteLine(grouplist[i].ToString());

}

ArrayList cardlist=nc.GetNews("microsoft.public.cn.dotnet.framework");

Console.WriteLine("=============================================================");

StreamWriter sw=File.CreateText("c:\\news.txt");

for(int i=0;i<cardlist.Count;i++){

Console.WriteLine(cardlist[i].ToString());

sw.WriteLine(cardlist[i].ToString());

sw.WriteLine("=============================================================");

}

sw.Flush();

sw.Close();

nc.Disconnect();

Console.ReadLine();

}

}

class NNTPClass:System.Net.Sockets.TcpClient{

public void Connect(string server){

string response;

Connect(server, 119);

response = Response();

if (response.Substring( 0, 3) != "200") {

throw new Exception(response);

}

}

public void Disconnect() {

string message;

string response;

message = "QUIT\r\n";

Write(message);

response = Response();

if (response.Substring( 0, 3) != "205") {

throw new Exception(response);

}

}

public ArrayList GetNewsgroups() {

string message;

string response;

ArrayList retval = new ArrayList();

message = "LIST\r\n";

Write(message);

response = Response();

if (response.Substring( 0, 3) != "215") {

throw new Exception(response);

}

while (true) {

response = Response();

if (response == ".\r\n" ||

response == ".\n") {

return retval;

}

else {

char[] seps = { ' ' };

string[] values = response.Split(seps);

retval.Add(values[0]);

continue;

}

}

}

public void Post(string newsgroup, string subject, string from,

string content) {

string message;

string response;

message = "POST " + newsgroup + "\r\n";

Write(message);

response = Response();

if (response.Substring( 0, 3) != "340") {

throw new Exception(response);

}

message = "From: " + from + "\r\n"

+ "Newsgroups: " + newsgroup + "\r\n"

+ "Subject: " + subject + "\r\n\r\n"

+ content + "\r\n.\r\n";

Write(message);

response = Response();

if (response.Substring( 0, 3) != "240") {

throw new Exception(response);

}

}

public ArrayList GetNews(string newsgroup) {

string message;

string response;

ArrayList retval = new ArrayList();

message = "GROUP " + newsgroup + "\r\n";

Write(message);

response = Response();

if (response.Substring( 0, 3) != "211") {

throw new Exception(response);

}

char[] seps = { ' ' };

string[] values = response.Split(seps);

long start = Int32.Parse(values[2]);

long end = Int32.Parse(values[3]);

if (start+100 < end && end > 100) {

start = end-100;

}

for (long i=start;i<end;i++) {

message = "ARTICLE " + i + "\r\n";

Write(message);

response = Response();

if (response.Substring( 0, 3) == "423") {

continue;

}

if (response.Substring( 0, 3) != "220") {

throw new Exception(response);

}

string article = "";

while (true) {

response = Response();

if (response == ".\r\n") {

break;

}

if (response == ".\n") {

break;

}

if (article.Length < 1024) {

article += response;

};

}

retval.Add(article);

}

return retval;

}

private string Response() {

//System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();

System.Text.Encoding enc=Encoding.Default;

byte []serverbuff = new Byte[1024];

NetworkStream stream = GetStream();

int count = 0;

while (true) {

byte []buff = new Byte[2];

int bytes = stream.Read( buff, 0, 1 );

if (bytes == 1) {

serverbuff[count] = buff[0];

count++;

if (buff[0] == '\n') {

break;

}

}

else {

break;

};

};

string retval = enc.GetString( serverbuff, 0, count );

System.Diagnostics.Debug.WriteLine("READ:" + retval);

return retval;

}

private void Write(string message) {

System.Text.ASCIIEncoding en = new System.Text.ASCIIEncoding() ;

byte[] WriteBuffer = new byte[1024] ;

WriteBuffer = en.GetBytes(message) ;

NetworkStream stream = GetStream() ;

stream.Write(WriteBuffer,0,WriteBuffer.Length);

System.Diagnostics.Debug.WriteLine("WRITE:" + message);

}

}

}

}

 
 
 
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