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.threading;
using system.io;

namespace myqq
{
 /// <summary>
 /// form1 的摘要說明。
 /// </summary>
 public class form1 : system.windows.forms.form
 {
  public bool runing=false; //標志
  public udpclient listen=new udpclient(2525);
  public ipendpoint end;
  public ipaddress groupaddress=ipaddress.parse("255.255.255.255"); //廣播地址
  public int groupport=2525;  //廣播端口
  public ipaddress myip;
  public string myname;
  public string romename;
  public ipaddress romeip;
  public string romecon;
  public senddata mysenddata = new senddata(); //本地的0號命令發送包
  public bool isfile;//傳送文件標志
  public string savepath;//傳文件的保存地址
  public string romefilename;//遠程文件名
  public string romefilel;//遠程文件用單位表示的長度，格式為 43m或437k
  public filestream sendfilestream;//發送文件流
 
  private system.windows.forms.listbox box;
  private system.windows.forms.label label1;
  private system.windows.forms.label label2;
  private system.windows.forms.button button1;
  private system.windows.forms.button button3;
  private system.windows.forms.textbox t_rec;
  private system.windows.forms.textbox t_send;
  private system.windows.forms.button button2;
  private system.windows.forms.button newmsg;
  private system.windows.forms.label online;
  private system.windows.forms.tooltip tooltip1;
  private system.windows.forms.imagelist imagelist1;
  private system.windows.forms.linklabel linklabel1;
  private system.windows.forms.label label3;
  private system.windows.forms.button button4;
  private system.windows.forms.openfiledialog openfiledialog1;
  private system.windows.forms.textbox t_filep;
  private system.windows.forms.savefiledialog savefiledialog1;
  private system.windows.forms.panel processa;
  private system.windows.forms.progressbar progressbar1;
  private system.windows.forms.panel processb;
  private system.windows.forms.progressbar progressbar2;
  private system.componentmodel.icontainer components;

  public form1()
  {
   //
   // windows 窗體設計器支持所必需的
   //
   initializecomponent();

   //
   // todo: 在 initializecomponent 調用后添加任何構造函數代碼
   //
  }

  /// <summary>
  /// 清理所有正在使用的資源。
  /// </summary>
  protected override void dispose( bool disposing )
  {
   if( disposing )
   {
    if (components != null)
    {
     components.dispose();
    }
   }
   base.dispose( disposing );
  }

  #region windows 窗體設計器生成的代碼
  /// <summary>
  /// 設計器支持所需的方法 - 不要使用代碼編輯器修改
  /// 此方法的內容。
  /// </summary>
  private void initializecomponent()
  {
   this.components = new system.componentmodel.container();
   system.resources.resourcemanager resources = new system.resources.resourcemanager(typeof(form1));
   this.box = new system.windows.forms.listbox();
   this.t_rec = new system.windows.forms.textbox();
   this.label1 = new system.windows.forms.label();
   this.label2 = new system.windows.forms.label();
   this.t_send = new system.windows.forms.textbox();
   this.button1 = new system.windows.forms.button();
   this.button3 = new system.windows.forms.button();
   this.online = new system.windows.forms.label();
   this.button2 = new system.windows.forms.button();
   this.newmsg = new system.windows.forms.button();
   this.tooltip1 = new system.windows.forms.tooltip(this.components);
   this.imagelist1 = new system.windows.forms.imagelist(this.components);
   this.linklabel1 = new system.windows.forms.linklabel();
   this.label3 = new system.windows.forms.label();
   this.t_filep = new system.windows.forms.textbox();
   this.button4 = new system.windows.forms.button();
   this.openfiledialog1 = new system.windows.forms.openfiledialog();
   this.savefiledialog1 = new system.windows.forms.savefiledialog();
   this.processa = new system.windows.forms.panel();
   this.progressbar1 = new system.windows.forms.progressbar();
   this.processb = new system.windows.forms.panel();
   this.progressbar2 = new system.windows.forms.progressbar();
   this.processa.suspendlayout();
   this.processb.suspendlayout();
   this.suspendlayout();
   //
   // box
   //
   this.box.itemheight = 12;
   this.box.location = new system.drawing.point(0, 32);
   this.box.name = "box";
   this.box.size = new system.drawing.size(200, 352);
   this.box.tabindex = 0;
   //
   // t_rec
   //
   this.t_rec.backcolor = system.drawing.systemcolors.inactiveborder;
   this.t_rec.forecolor = system.drawing.color.fromargb(((system.byte)(192)), ((system.byte)(64)), ((system.byte)(0)));
   this.t_rec.location = new system.drawing.point(208, 56);
   this.t_rec.multiline = true;
   this.t_rec.name = "t_rec";
   this.t_rec.scrollbars = system.windows.forms.scrollbars.vertical;
   this.t_rec.size = new system.drawing.size(328, 136);
   this.t_rec.tabindex = 1;
   this.t_rec.text = "";
   //
   // label1
   //
   this.label1.location = new system.drawing.point(208, 40);
   this.label1.name = "label1";
   this.label1.size = new system.drawing.size(120, 16);
   this.label1.tabindex = 2;
   this.label1.text = "接收：";
   //
   // label2
   //
   this.label2.location = new system.drawing.point(208, 200);
   this.label2.name = "label2";
   this.label2.size = new system.drawing.size(48, 16);
   this.label2.tabindex = 2;
   this.label2.text = "發送：";
   //
   // t_send
   //
   this.t_send.location = new system.drawing.point(208, 224);
   this.t_send.multiline = true;
   this.t_send.name = "t_send";
   this.t_send.scrollbars = system.windows.forms.scrollbars.vertical;
   this.t_send.size = new system.drawing.size(328, 120);
   this.t_send.tabindex = 1;
   this.t_send.text = "";
   //
   // button1
   //
   this.button1.location = new system.drawing.point(440, 352);
   this.button1.name = "button1";
   this.button1.size = new system.drawing.size(75, 32);
   this.button1.tabindex = 3;
   this.button1.text = "發  送";
   this.button1.click += new system.eventhandler(this.button1_click);
   //
   // button3
   //
   this.button3.flatstyle = system.windows.forms.flatstyle.popup;
   this.button3.location = new system.drawing.point(120, 5);
   this.button3.name = "button3";
   this.button3.size = new system.drawing.size(56, 23);
   this.button3.tabindex = 4;
   this.button3.text = "刷 新";
   this.button3.click += new system.eventhandler(this.button3_click);
   //
   // online
   //
   this.online.font = new system.drawing.font("宋體", 9f, system.drawing.fontstyle.regular, system.drawing.graphicsunit.point, ((system.byte)(134)));
   this.online.forecolor = system.drawing.color.blue;
   this.online.location = new system.drawing.point(8, 8);
   this.online.name = "online";
   this.online.size = new system.drawing.size(88, 16);
   this.online.tabindex = 5;
   this.online.text = "在線用戶：";
   //
   // button2
   //
   this.button2.location = new system.drawing.point(352, 352);
   this.button2.name = "button2";
   this.button2.size = new system.drawing.size(75, 32);
   this.button2.tabindex = 6;
   this.button2.text = "清  空";
   this.button2.click += new system.eventhandler(this.button2_click);
   //
   // newmsg
   //
   this.newmsg.location = new system.drawing.point(208, 56);
   this.newmsg.name = "newmsg";
   this.newmsg.size = new system.drawing.size(328, 136);
   this.newmsg.tabindex = 7;
   this.newmsg.text = "有新消息了！";
   this.newmsg.click += new system.eventhandler(this.newmsg_click);
   //
   // imagelist1
   //
   this.imagelist1.imagesize = new system.drawing.size(32, 32);
   this.imagelist1.imagestream = ((system.windows.forms.imageliststreamer)(resources.getobject("imagelist1.imagestream")));
   this.imagelist1.transparentcolor = system.drawing.color.transparent;
   //
   // linklabel1
   //
   this.linklabel1.location = new system.drawing.point(264, 200);
   this.linklabel1.name = "linklabel1";
   this.linklabel1.size = new system.drawing.size(48, 16);
   this.linklabel1.tabindex = 8;
   this.linklabel1.tabstop = true;
   this.linklabel1.text = "傳文件";
   this.linklabel1.linkclicked += new system.windows.forms.linklabellinkclickedeventhandler(this.linklabel1_linkclicked);
   //
   // label3
   //
   this.label3.location = new system.drawing.point(208, 240);
   this.label3.name = "label3";
   this.label3.size = new system.drawing.size(72, 16);
   this.label3.tabindex = 9;
   this.label3.text = "文件地址：";
   //
   // t_filep
   //
   this.t_filep.borderstyle = system.windows.forms.borderstyle.fixedsingle;
   this.t_filep.location = new system.drawing.point(272, 232);
   this.t_filep.name = "t_filep";
   this.t_filep.size = new system.drawing.size(233, 21);
   this.t_filep.tabindex = 10;
   this.t_filep.text = "";
   //
   // button4
   //
   this.button4.flatstyle = system.windows.forms.flatstyle.popup;
   this.button4.location = new system.drawing.point(504, 232);
   this.button4.name = "button4";
   this.button4.size = new system.drawing.size(32, 21);
   this.button4.tabindex = 11;
   this.button4.text = "…";
   this.button4.click += new system.eventhandler(this.button4_click);
   //
   // processa
   //
   this.processa.backcolor = system.drawing.systemcolors.window;
   this.processa.controls.add(this.progressbar1);
   this.processa.location = new system.drawing.point(224, 264);
   this.processa.name = "processa";
   this.processa.size = new system.drawing.size(288, 24);
   this.processa.tabindex = 12;
   //
   // progressbar1
   //
   this.progressbar1.location = new system.drawing.point(8, 6);
   this.progressbar1.name = "progressbar1";
   this.progressbar1.size = new system.drawing.size(272, 12);
   this.progressbar1.step = 5;
   this.progressbar1.tabindex = 0;
   //
   // processb
   //
   this.processb.backcolor = system.drawing.systemcolors.control;
   this.processb.controls.add(this.progressbar2);
   this.processb.location = new system.drawing.point(224, 112);
   this.processb.name = "processb";
   this.processb.size = new system.drawing.size(288, 24);
   this.processb.tabindex = 12;
   //
   // progressbar2
   //
   this.progressbar2.location = new system.drawing.point(8, 6);
   this.progressbar2.name = "progressbar2";
   this.progressbar2.size = new system.drawing.size(272, 12);
   this.progressbar2.step = 5;
   this.progressbar2.tabindex = 0;
   //
   // form1
   //
   this.autoscalebasesize = new system.drawing.size(6, 14);
   this.clientsize = new system.drawing.size(544, 389);
   this.controls.add(this.processb);
   this.controls.add(this.processa);
   this.controls.add(this.t_send);
   this.controls.add(this.button4);
   this.controls.add(this.t_filep);
   this.controls.add(this.label3);
   this.controls.add(this.linklabel1);
   this.controls.add(this.button2);
   this.controls.add(this.online);
   this.controls.add(this.button3);
   this.controls.add(this.button1);
   this.controls.add(this.label1);
   this.controls.add(this.box);
   this.controls.add(this.label2);
   this.controls.add(this.t_rec);
   this.controls.add(this.newmsg);
   this.icon = ((system.drawing.icon)(resources.getobject("$this.icon")));
   this.name = "form1";
   this.text = "小y";
   this.closing += new system.componentmodel.canceleventhandler(this.form1_closing);
   this.load += new system.eventhandler(this.form1_load);
   this.processa.resumelayout(false);
   this.processb.resumelayout(false);
   this.resumelayout(false);

  }
  #endregion

  /// <summary>
  /// 應用程序的主入口點。
  /// </summary>
  [stathread]
  static void main()
  {
   application.run(new form1());
  }
  //數據包格式
  public struct senddata
  {
   public byte commandno;//命令號 1字節
   public ipaddress fromip;//發送端ip 4字節
   public int namelength;  //名字的字節數  4字節
   public string computername;//計算機名  x字節
   public ipaddress toip;//接收端ip； 4字節
   public string content;//內容  y字節
  }
  private void form1_load(object sender, system.eventargs e)
  {
           
   end=new ipendpoint(groupaddress,groupport);
   //初始化計算機名和端口
   iphostentry myentry=dns.gethostbyname(dns.gethostname());
   myip = new ipaddress(myentry.addresslist[0].address);
   myname = dns.gethostname();

   box.items.add("ip            主機名");

   //開啟監聽線程
   runing=true;
   thread mythread=new thread(new threadstart(this.listenport));
   mythread.isbackground = false;
   mythread.start();

   //發送上線信息
   mysenddata.commandno = 0;
   mysenddata.fromip = myip;
   mysenddata.computername = myname;
   mysenddata.toip = myip;
   mysenddata.content = "上線提示";
   byte[] sendb = structtobytes(mysenddata);
   sendpack(sendb);

   //初始化窗體位置
   t_send.height=120;
   t_send.top=224;
   linklabel1.text="傳文件";
            processa.visible=false;//發送的進度
   processb.visible=false;//接收的進度
  }

//偵聽指定端口的廣播地址udp包
  public void listenport()
  {
   ipendpoint tempend=new ipendpoint(ipaddress.any,2525);
   while(runing)
   {
    application.doevents();
    try
    {
     byte[] recb=listen.receive(ref tempend);

     // 檢查所接收到的信息and處理之
     checkmessage(recb);
    }
    catch(exception e)
    {
     messagebox.show("出現錯誤："+e.message.tostring());
     break;
    }
   
   }
   listen.close();
   box.items.add("線程已經退出！");
   runing=false;
  }

//循環接收包
  public void checkmessage(byte[] recbb)
  {
   senddata recdata=bytestostruct(recbb);
   romename=recdata.computername;
   romeip=recdata.fromip;
   romecon=recdata.content;
   switch(recdata.commandno)
   {
    case 0x00: //刷新
     if (recdata.toip.equals(myip))
     {
      if(box.findstring(recdata.fromip.tostring()+"  "+recdata.computername)<=0)
       box.items.add(recdata.fromip.tostring() + "  " + recdata.computername);
      online.text="在線用戶："+(box.items.count-1)+"人";
     }
     else if(recdata.fromip.equals(recdata.toip))
     {
      //從其他機器發送過來的刷新請求
      //返回自己的信息
      mysenddata.commandno = 0x00;
      mysenddata.toip = recdata.toip;
      mysenddata.content = "上線提示";
      byte[] sendb = structtobytes(mysenddata);
      sendpack(sendb);
      //如果不存在則添加該用戶
      if (box.findstring(recdata.fromip.tostring() + "  " + recdata.computername) <= 0)
       box.items.add(recdata.fromip.tostring() + "  " + recdata.computername);
     }
     break;
    case 0x01: //發言
     if (recdata.toip.equals(myip)&&!isfile)
     {//當傳送的不包含文件時才顯示“有新消息了”
      showne();
     }
     break;
    case 0x02: //請求傳文件
     if(recdata.toip.equals(myip))
     {//準備接收文件
      romefilename=romecon.split('+')[0];
      romefilel=romecon.split('+')[1];
                        readyrecfile();
     }
     break;
    case 0x03://傳文件
     if(recdata.toip.equals(myip))
     {//傳送文件
                        thread mysend=new thread(new threadstart(sendfile));
      mysend.start();
                    }
     break;
    case 0x09: //確認包
     if (recdata.toip.equals(myip))
      messagebox.show("信息來自："+recdata.computername+"("+recdata.fromip.tostring()+")/r/n"+recdata.content,"消息");
     break;
   }
  
  }
      
//發送數據包到廣播地址
  public void sendpack(byte[] sendbs)
  {
   try
   {
    listen.send(sendbs, sendbs.length, end);
   }
   catch(exception e)
   {
    messagebox.show(e.message.tostring());
   }
  }
//struct轉換成byte[]
  public static byte[] structtobytes(senddata structobj)
  {
   byte[] commandb=new byte[1];
   commandb[0]=structobj.commandno;
   byte[] fromipb=structobj.fromip.getaddressbytes();
   byte[] nameb=encoding.default.getbytes(structobj.computername);
   byte[] lengthb=bitconverter.getbytes(nameb.length);
   byte[] toipb=structobj.toip.getaddressbytes();
   byte[] contentb=encoding.default.getbytes(structobj.content);
   byte[] buffer=new byte[13+nameb.length+contentb.length];
   int index=0;
   commandb.copyto(buffer,index);
   index+=commandb.length;
   fromipb.copyto(buffer,index);
   index+=fromipb.length;
   lengthb.copyto(buffer,index);
   index+=lengthb.length;
   nameb.copyto(buffer,index);
   index+=nameb.length;
   toipb.copyto(buffer,index);
   index+=toipb.length;
   contentb.copyto(buffer,index);
   return buffer;
  }
//byte轉換成struct
  public static senddata bytestostruct(byte[] bytes)
  {
   senddata myre=new senddata();
   myre.commandno=bytes[0];
   byte[] ipb=new byte[4];
   array.copy(bytes,1,ipb,0,4);
   myre.fromip=ipaddress.parse(ipbytetostring(ipb));
   myre.namelength=bitconverter.toint32(bytes,5);
   myre.computername=encoding.default.getstring(bytes,9,myre.namelength);
   array.copy(bytes,9+myre.namelength,ipb,0,4);
   myre.toip=ipaddress.parse(ipbytetostring(ipb));
   myre.content=encoding.default.getstring(bytes,13+myre.namelength,bytes.length-13-myre.namelength);
   return myre;
  }
//將byte[]表示的ip地址轉換成ipaddress類型
  public static string ipbytetostring(byte[] ipbt)
  {
   string temp="";
   temp=(int)ipbt[0]+"."+(int)ipbt[1]+"."+(int)ipbt[2]+"."+(int)ipbt[3];
   return temp;
  }
//刷新
  private void button3_click(object sender, system.eventargs e)
  {
   box.items.clear();
   box.items.add("ip            主機名");
   mysenddata.commandno = 0;
   mysenddata.fromip = myip;
   mysenddata.computername = myname;
   mysenddata.toip = myip;
   mysenddata.content = "上線提示";
   byte[] sendb = structtobytes(mysenddata);
   sendpack(sendb);
  }

//關閉循環
  private void form1_closing(object sender, system.componentmodel.canceleventargs e)
  {
   runing=false;
   udpclient mm=new udpclient();
   ipendpoint tempipend=new ipendpoint(ipaddress.parse("127.0.0.1"),2525);
   mysenddata.commandno = 0;
   mysenddata.fromip = myip;
   mysenddata.computername = myname;
   mysenddata.toip = myip;
   mysenddata.content = "上線提示";
   byte[] sendb = structtobytes(mysenddata);
   mm.send(sendb,sendb.length,tempipend);
  }
//發送
  private void button1_click(object sender, system.eventargs e)
  {
   if(box.selecteditem==null||box.selectedindex==0)
   {
    messagebox.show("請先選擇一個用戶！");
    return;
   }
   if(linklabel1.text=="不傳文件"&&t_filep.text!="")
   {//需要傳文件
    //首先發送2號命令 要求對方準備接收
    sendfilestream=new filestream(t_filep.text,filemode.open,fileaccess.read);
    long filelength=sendfilestream.length;
    string totalsteps;
    int temp;
    if(filelength/(1024*1024)>10)
    {//文件>10m時用m做為進度最小單位
     temp=(int)(filelength/(1024*1024));
     totalsteps=temp+"m";
    }
    else
    {//小于10m的文件用k做為最小單位
     temp=(int)(filelength/1024);
     totalsteps=temp+"k";
    }
    //用做接收端時的公共變量保存發送的臨時值
    romefilel=totalsteps;
    string filename=path.getfilename(t_filep.text);
    mysenddata.commandno = 0x02;
    mysenddata.fromip = myip;
    mysenddata.computername = myname;
    mysenddata.toip = ipaddress.parse(box.selecteditem.tostring().split(' ')[0]);
    mysenddata.content = filename+"+"+totalsteps;//格式：yy.txt+62k+64990
    byte[] sendb = structtobytes(mysenddata);
    sendpack(sendb);
  
    //界面上的處理
    t_send.height=120;
    t_send.top=224;
    linklabel1.text="傳文件";
   }
   //發言
   if(t_send.text=="")
   {
    return;
   }
   mysenddata.commandno = 0x01;
   mysenddata.fromip = myip;
   mysenddata.computername = myname;
   mysenddata.toip = ipaddress.parse(box.selecteditem.tostring().split(' ')[0]);
   mysenddata.content = t_send.text;
   byte[] sendb2 = structtobytes(mysenddata);
   sendpack(sendb2);
  }
//清空
  private void button2_click(object sender, system.eventargs e)
  {
   t_send.text=string.empty;
   t_rec.text=string.empty;
  }
//單擊顯示接收的信息并隱藏自身
  private void newmsg_click(object sender, system.eventargs e)
  {
   if(isfile)
   {//當傳送的含有文件時
    savefiledialog1.filter="所有格式|*.*";
    savefiledialog1.filename=romefilename;
    if(savefiledialog1.showdialog()==dialogresult.ok)
     savepath=savefiledialog1.filename;
    else
     return;
    t_rec.text="消息來自"+romename+"("+romeip.tostring()+")"+datetime.now.toshortdatestring();
    t_rec.text+="/r/n> "+romecon;
    //界面的處理
    newmsg.sendtoback();
    t_send.height=120;
    t_send.top=224;
    linklabel1.text="傳文件";
    //返回一個確認接收包
    mysenddata.commandno = 0x03;
    mysenddata.fromip = myip;
    mysenddata.computername = myname;
    mysenddata.toip = romeip;
    mysenddata.content = "ready!";
    byte[] sendb = structtobytes(mysenddata);
    sendpack(sendb);
    //復位文件標志
    isfile=false;
    //同時開啟線程開始監聽
    thread myrecv=new thread(new threadstart(listenport));
    myrecv.start();
    return;
   }
   t_rec.text="消息來自"+romename+"("+romeip.tostring()+")"+datetime.now.toshortdatestring();
   t_rec.text+="/r/n> "+romecon;
   mysenddata.commandno = 0x09;
   mysenddata.toip = romeip;
   mysenddata.content = "信息被打開！";
   byte[] sendb2 = structtobytes(mysenddata);
   sendpack(sendb2);
   newmsg.sendtoback();
  }
//當有信息時顯示提示按鈕
  public void showne()
  {
   //窗體顯示
   if(this.windowstate!=formwindowstate.normal)
   {
    this.visible=true;
    this.windowstate=formwindowstate.normal;
   }
   newmsg.text="有新消息了";
   newmsg.bringtofront();
  }
//準備接收文件
  public void readyrecfile()
  {
   //窗體顯示
   if(this.windowstate!=formwindowstate.normal)
   {
    this.visible=true;
    this.windowstate=formwindowstate.normal;
   }
   isfile=true;
   newmsg.text=romefilename+"("+romefilel+")";
   newmsg.bringtofront();
  }
//傳文件
  private void linklabel1_linkclicked(object sender, system.windows.forms.linklabellinkclickedeventargs e)
  {
   if(linklabel1.text=="傳文件")
   {
    t_send.height=80;
    t_send.top=264;
    linklabel1.text="不傳文件";
   }
   else
   {
    t_send.height=120;
    t_send.top=224;
    linklabel1.text="傳文件";
   }
  }
//打開文件
  private void button4_click(object sender, system.eventargs e)
  {
   openfiledialog1.filter="所有文件|*.*|壓縮文件|*.rar";
   if(openfiledialog1.showdialog()==dialogresult.ok)
   {
    t_filep.text=openfiledialog1.filename;
   }
  }

//監聽文件傳送socket的線程——————功能：接收文件
  public void listenport()
  {
   tcplistener listener=new tcplistener(2626);
   listener.start();
   socket s=listener.acceptsocket();
   filestream filestream=new filestream(savepath,filemode.openorcreate,fileaccess.write);
      networkstream stream=new networkstream(s);
   //定義緩沖區
   byte[] bb=new byte[1024];
   //循環讀socket流
   int tt=0;
   //進度條
   processb.visible=true;
   processb.backcolor=system.drawing.systemcolors.control;
   int stepoff;
   if(romefilel[romefilel.length-1]=='k')
    stepoff=1024;
   else
    stepoff=1024*1024;
   int totalste=int.parse(romefilel.substring(0,romefilel.length-1));
   progressbar2.maximum=totalste;
   progressbar2.step=totalste/20;
   float recbytes=0;
   while((tt=stream.read(bb,0,1024))!=0)
   {//接收數據
    filestream.write(bb,0,tt);
    filestream.flush();
    //更新進度條
    recbytes+=(float)tt/stepoff;
    progressbar2.value=(int)recbytes;
   }
   filestream.close();
   processb.visible=false;
   messagebox.show("文件接收完畢！");
  }
//傳送文件的線程————————功能：發送文件服務端
  public void sendfile()
  {
   tcpclient serverclient=new tcpclient();
   serverclient.connect(romeip,2626);
   networkstream stream=serverclient.getstream();
   //定義緩沖區
   byte[] bb=new byte[1024];
   //循環讀文件
   int number;
   //進度條
   processa.visible=true;
   processa.backcolor=system.drawing.systemcolors.window;
   int stepoff;
   if(romefilel[romefilel.length-1]=='k')
    stepoff=1024;
   else
    stepoff=1024*1024;
   int totalste=int.parse(romefilel.substring(0,romefilel.length-1));
   progressbar1.maximum=totalste;
            progressbar1.step=totalste/20;
   float sendedbytes=0;
   while((number=sendfilestream.read(bb,0,1024))!=0)
   {//向客戶端發送流
    stream.write(bb,0,number);
    //刷新流
    stream.flush();
    //進度條
    sendedbytes+=(float)number/stepoff;
    progressbar1.value=(int)sendedbytes;
   }
   sendfilestream.close();
   stream.close();
   processa.visible=false;
   messagebox.show("文件傳送完畢！");
  }
 }
}