最近一個項目要用到點對點檔案傳輸，俺就到處找資料寫程式，最後終於完成了，為了讓別人少走些彎路，俺決定將俺程式中最重要的部分貢獻出來，希望對大家有所協助。
俺的程式分三部分，包括髮送部分、接受部分和一個兩者共用的通訊基類，這個基類才是俺心血的結晶：）
一、通訊基類
using System;
using System.Net.Sockets;
using System.Net ;
using System.IO ;
using System.Windows.Forms;
using System.Text;
namespace BaseClass
{
/// <summary>
/// 傳送資訊的格式為 給定長度的命令部分+給定長度的命令注釋部分+可變長度的長度資訊+可變長度的資訊部分
/// </summary>
public class CommunClass
{
public CommunClass()
{
//
// TODO: 在此處添加建構函式邏輯
//
}
/// <summary>
/// 命令部分的長度
/// </summary>
private static readonly int CMDLEN = 50 ;
/// <summary>
/// 命令注釋部分的長度
/// </summary>
private static readonly int DESCLEN = 100 ;
/// <summary>
/// 可變長度的長度資訊部分所佔的位元組數
/// </summary>
private static readonly int DYNAMICLENGTHLEN = 10 ;
/// <summary>
/// 每次處理可變資訊部分的長度
/// </summary>
private static readonly int DEALLEN = 1024 ;
/// <summary>
/// /應答的最大長度
/// </summary>
private static readonly int RESPONLEN = 20 ;
/// <summary>
/// 用於填充命令或注釋不足長度部分的字元
/// </summary>
private static readonly char FILLCHAR = '^' ;
/// <summary>
/// 成功發送一部分資料後的回調方法(也可以認為是觸發的事件，但嚴格來說還不是)
/// </summary>
public delegate void OnSend(int iTotal,int iSending) ;
/// <summary>
/// 根據給定的伺服器和連接埠號碼建立串連
/// </summary>
/// <param name="strHost">伺服器名</param>
/// <param name="iPort">連接埠號碼</param>
/// <returns></returns>
public static Socket ConnectToServer(string strHost,int iPort)
{
try
{
IPAddress ipAddress = Dns.Resolve(strHost).AddressList[0];
IPEndPoint ipPoint = new IPEndPoint(ipAddress,iPort) ;
Socket s = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp) ;
s.Connect(ipPoint) ;
return s ;
}
catch (Exception e)
{
throw (new Exception("建立到伺服器的串連出錯" + e.Message)) ;
}
}
/// <summary>
/// 將文本寫到Socket中
/// </summary>
/// <param name="s">要發送資訊的Socket</param>
/// <param name="strInfo">要發送的資訊</param>
/// <returns>是否成功</returns>
public static bool WriteTextToSocket(Socket s,string strInfo)
{
byte [] buf = Encoding.UTF8.GetBytes(strInfo) ;
try
{
s.Send(buf,0,buf.Length,SocketFlags.None) ;
return true ;
}
catch(Exception err)
{
MessageBox.Show("發送文本失敗！"+err.Message) ;
return false ;
}
}
/// <summary>
/// 將命令文本寫到Socket中
/// </summary>
/// <param name="s">要發送命令文本的Socket</param>
/// <param name="strInfo">要發送的命令文本</param>
/// <returns>是否成功</returns>
public static bool WriteCommandToSocket(Socket s,string strCmd)
{
if (strCmd == "")
strCmd = "NOP" ;
strCmd = strCmd.PadRight(CMDLEN,FILLCHAR) ;
return WriteTextToSocket(s,strCmd) ;
}
/// <summary>
/// 將命令注釋寫到Socket中
/// </summary>
/// <param name="s">要發送命令注釋的Socket</param>
/// <param name="strInfo">要發送的命令注釋</param>
/// <returns>是否成功</returns>
public static bool WriteCommandDescToSocket(Socket s,string strDesc)
{
if (strDesc == "")
strDesc = "0" ;
strDesc = strDesc.PadRight(DESCLEN,FILLCHAR) ;
return WriteTextToSocket(s,strDesc) ;
}
/// <summary>
/// 發送可變資訊的位元組數
/// </summary>
/// <param name="s">要發送位元組數的Socket</param>
/// <param name="iLen">位元組數</param>
/// <returns>是否成功</returns>
public static bool WriteDynamicLenToSocket(Socket s,int iLen)
{
string strLen = iLen.ToString().PadRight(DYNAMICLENGTHLEN,FILLCHAR) ;
return WriteTextToSocket(s,strLen) ;
}
/// <summary>
/// 將緩衝的指定部分發送到Socket
/// </summary>
/// <param name="s">要發送緩衝的Socket</param>
/// <param name="buf">要發送的緩衝</param>
/// <param name="iStart">要發送緩衝的起始位置</param>
/// <param name="iCount">要發送緩衝的位元組數</param>
/// <param name="iBlock">每次發送的位元組說</param>
/// <param name="SendSuccess">每次發送成功後的回呼函數</param>
/// <returns>是否發送成功</returns>
public static bool WriteBufToSocket(Socket s,byte [] buf,int iStart,int iCount,int iBlock,OnSend SendSuccess)
{
int iSended = 0 ;
int iSending = 0 ;
while(iSended<iCount)
{
if (iSended + iBlock <= iCount)
iSending = iBlock ;
else
iSending = iCount - iSended ;
s.Send(buf,iStart+iSended,iSending,SocketFlags.None) ;
iSended += iSending ;
if (ReadResponsionFromSocket(s)=="OK")
if (SendSuccess != null)
SendSuccess(iCount,iSended) ;
else
return false;
}
return true ;
}
/// <summary>
/// 將長度不固定文本發送到socket
/// </summary>
/// <param name="s">要發送文本的Socket</param>
/// <param name="strText">要發送的文本</param>
/// <param name="OnSendText">成功發送一部分文本後的回呼函數</param>
/// <param name="settextlen">得到文本長度的回呼函數</param>
/// <returns></returns>
public static bool WriteDynamicTextToSocket(Socket s,string strText,
OnSend OnSendText)
{
byte [] buf = Encoding.UTF8.GetBytes(strText) ;
int iLen = buf.Length ;
try
{
WriteDynamicLenToSocket(s,iLen) ;
return WriteBufToSocket(s,buf,0,iLen,DEALLEN,OnSendText) ;
}
catch(Exception err)
{
MessageBox.Show("發送文本失敗！"+err.Message) ;
return false ;
}
}
/// <summary>
/// 將檔案寫到Socket
/// </summary>
/// <param name="s">要傳送檔案的Socket</param>
/// <param name="strFile">要發送的檔案</param>
/// <returns>是否成功</returns>
public static bool WriteFileToSocket(Socket s,string strFile,
OnSend OnSendFile)
{
FileStream fs = new FileStream(strFile,FileMode.Open,FileAccess.Read,FileShare.Read) ;
int iLen = (int)fs.Length ;
WriteDynamicLenToSocket(s,iLen) ;
byte [] buf = new byte[iLen] ;
try
{
fs.Read(buf,0,iLen) ;
return WriteBufToSocket(s,buf,0,iLen,DEALLEN,OnSendFile) ;
}
catch(Exception err)
{
MessageBox.Show("傳送檔案失敗！"+err.Message) ;
return false ;
}
finally
{
fs.Close() ;
}
}
/// <summary>
/// 對方對自己訊息的簡單回應
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
public static string ReadResponsionFromSocket( Socket s)
{
byte [] bufCmd = new byte[RESPONLEN] ;
int iCount = s.Receive(bufCmd) ;
string strRespon = Encoding.UTF8.GetString(bufCmd,0,iCount) ;
return strRespon ;
}
/// <summary>
/// 從Socket讀取命令
/// </summary>
/// <param name="s">要讀取命令的Socket</param>
/// <returns>讀取的命令</returns>
public static string ReadCommandFromSocket( Socket s)
{
byte [] bufCmd = new byte[CMDLEN] ;
int iCount = s.Receive(bufCmd,0,CMDLEN,SocketFlags.Partial) ;
string strCommand = Encoding.UTF8.GetString(bufCmd,0,CMDLEN) ;
return strCommand = strCommand.TrimEnd(FILLCHAR) ;
}
/// <summary>
/// 讀取命令注釋
/// </summary>
/// <param name="s">要讀取命令注釋的Socket</param>
/// <returns>讀取的命令注釋</returns>
public static string ReadCommandDescFromSocket( Socket s)
{
byte [] bufCmd = new byte[DESCLEN] ;
int iCount = s.Receive(bufCmd,0,DESCLEN,SocketFlags.Partial) ;
string strCommand = Encoding.UTF8.GetString(bufCmd,0,DESCLEN) ;
return strCommand = strCommand.TrimEnd(FILLCHAR) ;
}
/// <summary>
/// 讀取可變部分的長度
/// </summary>
/// <param name="s">要讀取可變部分長度的Socket</param>
/// <returns>讀取的可變部分的長度</returns>
public static int ReadDynamicLenFromSocket( Socket s)
{
byte [] bufCmd = new byte[DYNAMICLENGTHLEN] ;
int iCount = s.Receive(bufCmd,0,DYNAMICLENGTHLEN,SocketFlags.Partial) ;
string strCommand = Encoding.UTF8.GetString(bufCmd,0,DYNAMICLENGTHLEN) ;
return int.Parse(strCommand.TrimEnd(FILLCHAR)) ;
}
/// <summary>
/// 讀取文本形式的可變資訊
/// </summary>
/// <param name="s">要讀取可變資訊的Socket</param>
/// <returns>讀取的可變資訊</returns>
public static string ReadDynamicTextFromSocket( Socket s)
{
int iLen = ReadDynamicLenFromSocket(s) ;
byte [] buf = new byte[iLen] ;
string strInfo = "" ;
int iReceiveded = 0 ;
int iReceiveing = 0 ;
while(iReceiveded<iLen)
{
if (iReceiveded + DEALLEN <= iLen)
iReceiveing = DEALLEN ;
else
iReceiveing = iLen - iReceiveded ;
s.Receive(buf,iReceiveded,iReceiveing,SocketFlags.None) ;
CommunClass.WriteTextToSocket(s,"OK") ;
iReceiveded+= iReceiveing ;
}
strInfo = Encoding.UTF8.GetString(buf,0,iLen) ;
return strInfo ;
}
/// <summary>
/// 讀取檔案形式的可變資訊
/// </summary>
/// <param name="s">要讀取可變資訊的Socket</param>
/// <param name="strFile">讀出後的檔案儲存位置</param>
/// <returns>是否讀取成功</returns>
public static bool ReadDynamicFileFromSocket( Socket s,string strFile)
{
int iLen = ReadDynamicLenFromSocket(s) ;
byte [] buf = new byte[iLen] ;
FileStream fs = new FileStream(strFile,FileMode.Create,FileAccess.Write) ;
try
{
int iReceiveded = 0 ;
int iReceiveing = 0 ;
while(iReceiveded<iLen)
{
if (iReceiveded + DEALLEN <= iLen)
iReceiveing = DEALLEN ;
else
iReceiveing = iLen - iReceiveded ;
s.Receive(buf,iReceiveded,iReceiveing,SocketFlags.None) ;
CommunClass.WriteTextToSocket(s,"OK") ;
iReceiveded+= iReceiveing ;
}
fs.Write(buf,0,iLen) ;
return true ;
}
catch(Exception err)
{
MessageBox.Show("接收檔案失敗"+err.Message) ;
return false ;
}
finally
{
fs.Close() ;
}
}
}//end class
}//end namespace
上面是俺的通訊基礎類，有了這個類，再進行發送接受還不是小菜一碟嗎？
未完待續
