private void InitializeComponent ( )
{
this.button1 = new System.Windows.Forms.Button ( ) ;
this.button2 = new System.Windows.Forms.Button ( ) ;
this.textBox1 = new System.Windows.Forms.TextBox ( ) ;
this.textBox2 = new System.Windows.Forms.TextBox ( ) ;
this.label1 = new System.Windows.Forms.Label ( ) ;
this.label2 = new System.Windows.Forms.Label ( ) ;
this.label3 = new System.Windows.Forms.Label ( ) ;
this.textBox3 = new System.Windows.Forms.TextBox ( ) ;
this.SuspendLayout ( ) ;
this.button1.FlatStyle = System.Windows.Forms.FlatStyle.Flat ;
this.button1.Location = new System.Drawing.Point ( 128 , 128 ) ;
this.button1.Name = "button1" ;
this.button1.Size = new System.Drawing.Size ( 112 , 40 ) ;
this.button1.TabIndex = 0 ;
this.button1.Text = "獲取" ;
this.button1.Click += new System.EventHandler ( this.button1_Click ) ;
this.button2.FlatStyle = System.Windows.Forms.FlatStyle.Flat ;
this.button2.Location = new System.Drawing.Point ( 128 , 184 ) ;
this.button2.Name = "button2" ;
this.button2.Size = new System.Drawing.Size ( 112 , 40 ) ;
this.button2.TabIndex = 1 ;
this.button2.Text = "對(duì)時(shí)" ;
this.button2.Click += new System.EventHandler ( this.button2_Click ) ;
this.textBox1.Location = new System.Drawing.Point ( 120 , 56 ) ;
this.textBox1.Name = "textBox1" ;
this.textBox1.Size = new System.Drawing.Size ( 200 , 21 ) ;
this.textBox1.TabIndex = 2 ;
this.textBox1.Text = "" ;
this.textBox2.Location = new System.Drawing.Point ( 120 , 88 ) ;
this.textBox2.Name = "textBox2" ;
this.textBox2.Size = new System.Drawing.Size ( 200 , 21 ) ;
this.textBox2.TabIndex = 3 ;
this.textBox2.Text = "" ;
this.label1.Location = new System.Drawing.Point ( 48 , 56 ) ;
this.label1.Name = "label1" ;
this.label1.TabIndex = 4 ;
this.label1.Text = "本地時(shí)間：" ;
this.label2.Location = new System.Drawing.Point ( 40 , 88 ) ;
this.label2.Name = "label2" ;
this.label2.Size = new System.Drawing.Size ( 88 , 24 ) ;
this.label2.TabIndex = 5 ;
this.label2.Text = "服務(wù)器時(shí)間：" ;
this.label3.Location = new System.Drawing.Point ( 16 , 24 ) ;
this.label3.Name = "label3" ;
this.label3.Size = new System.Drawing.Size ( 112 , 23 ) ;
this.label3.TabIndex = 6 ;
this.label3.Text = "設(shè)定服務(wù)器地址：" ;
this.textBox3.Location = new System.Drawing.Point ( 120 , 24 ) ;
this.textBox3.Name = "textBox3" ;
this.textBox3.Size = new System.Drawing.Size ( 200 , 21 ) ;
this.textBox3.TabIndex = 7 ;
this.textBox3.Text = "" ;
this.AutoScaleBaseSize = new System.Drawing.Size ( 6 , 14 ) ;
this.ClientSize = new System.Drawing.Size ( 352 , 245 ) ;
this.Controls.AddRange ( new System.Windows.Forms.Control[] {
   this.textBox3 ,
   this.textBox2 ,
   this.textBox1 ,
   this.button2 ,
   this.button1 ,
   this.label1 ,
   this.label2 ,
   this.label3} ) ;
this.MaximizeBox = false ;
this.Name = "Form1" ;
this.Text = "UDP對(duì)時(shí)客戶端" ;
this.ResumeLayout ( false ) ;
}

[ DllImport (  "Kernel32.dll"  )]
private static extern bool SetSystemTime (  SystemTime time ) ;
//引入API函數(shù)

{
 client = new UdpClient ( port ) ;
 IPAddress a = IPAddress.Parse  ( "127001" ) ;
 receivePoint = new IPEndPoint ( a  , port ) ;
 IPAddress HostIP ;
 bool continueLoop = true ;
 while ( continueLoop )
 {
 string hostName = Dns.GetHostName ( ) ;
 System.Text.ASCIIEncoding encode 
          = new System.Text.ASCIIEncoding ( ) ;
 //定義發(fā)送到服務(wù)器端的請(qǐng)求信息
 //請(qǐng)求信息是一個(gè)字符串，為客戶端名稱(chēng)和接收服務(wù)器反饋信息的端口號(hào)組成的字符串
 string sendString = hostName + "/" + port.ToString ( ) ;
 byte[] sendData = encode.GetBytes ( sendString ) ;
 //判斷使用者輸入的是IP地址還是計(jì)算機(jī)名稱(chēng)
 try
 {
  HostIP = IPAddress.Parse  ( textBox3.Text ) ;
 }
 catch
 {
  //如果輸入的是計(jì)算機(jī)名稱(chēng)，則按照?qǐng)?zhí)行下列代碼。
  //發(fā)送請(qǐng)求信息
  client.Send ( sendData , sendData.
                   Length , textBox3.Text , 8080 ) ;
  //接收來(lái)自服務(wù)器端的信息
   byte[] recData = 
                           client.Receive ( ref receivePoint ) ;
  timeString = encode.GetString ( recData ) ;
  client.Close ( ) ;
  continueLoop=false ;    
  return ;
 }
 //輸入的是IP地址，則執(zhí)行下列代碼
 IPEndPoint host = new IPEndPoint ( HostIP ,8080 ) ;
 //發(fā)送請(qǐng)求信息
 client.Send ( sendData , sendData.Length , host ) ;
 //接收來(lái)自服務(wù)器端的信息
 byte[] recData1 = client.Receive ( ref receivePoint ) ;
 //獲取服務(wù)器端的時(shí)間和日期
 timeString = encode.GetString ( recData1 ) ;
 client.Close ( ) ;
 //退出循環(huán)
 continueLoop=false ;    
}
}

private void button1_Click ( object sender , System.EventArgs e )
{
 start_client ( ) ;
 textBox1.Text = DateTime.Now.ToString ( ) ;
 //顯示客戶端當(dāng)前時(shí)間和日期
 textBox2.Text = timeString ;
 //顯示服務(wù)器當(dāng)前時(shí)間和日期
}

private void button2_Click ( object sender , System.EventArgs e )
{
 start_client ( ) ;
 //把接收來(lái)的數(shù)據(jù)轉(zhuǎn)換時(shí)間日期格式
 try
 {
  temp = DateTime.Parse  ( timeString ) ;
 }
 catch
 {
  MessageBox.Show  ( "錯(cuò)誤時(shí)間" ) ;
  return ;
 }
 //根據(jù)得到的時(shí)間日期，來(lái)定義時(shí)間、日期
 SystemTime st= new SystemTime ( ) ;
 st.year=  ( short )temp.Year ;
 st.Month= ( short )temp.Month ;
 st.DayOfWeek= ( short )temp.DayOfWeek ;
 st.Day= ( short )temp.Day ;
 st.Hour=Convert.ToInt16 ( temp.Hour ) ;
 if ( st.Hour>=12 )
 {
  st.Hour-= ( short )8 ;
 }
 else if ( st.Hour >= 8 )
 {
  st.Hour-= ( short )8 ;
 }
 else
 {
  st.Hour+= ( short )16 ;
 }
 st.Minute=Convert.ToInt16 ( temp.Minute ) ;
 st.Second=Convert.ToInt16 ( temp.Second ) ;
 st.Milliseconds=Convert.ToInt16 ( temp.Millisecond ) ;
 //修改本地端的時(shí)間和日期
 if ( SetSystemTime ( st ) )
 {
 MessageBox.Show ( DateTime.Now.ToString ( ) ,"修改成功" ) ;
 } 
 else
 MessageBox.Show ( "不成功！" ,"不成功" ) ;
}