C# ping命令的实现方法：Ping类的使用

本文介绍C# ping命令的实现方法，首先利用原始Socket套接字，实现ICMP协议，然后执行ping命令。最后，还可以使用C# 2.0中新增的Ping类来实现。

以下介绍C# ping命令的两种实现方法。

C# ping命令实现：利用原始Socket套接字，实现ICMP协议。

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;

namespace PingC
{
class ping
{
const int SOCKET_ERROR = -1;
const int ICMP_ECHO = 8;
static void Main(string[] args)
{
ping p = new ping();
Console.WriteLine("请输入要 Ping 的IP或者主机名字：");
string MyUrl = Console.ReadLine();
Console.WriteLine("正在 Ping " + MyUrl + " ……");
Console.Write(p.PingHost(MyUrl));
}
public string PingHost(string host)
{
// 声明 IPHostEntry
IPHostEntry ServerHE, fromHE;
int nBytes = 0;
int dwStart = 0, dwStop = 0;

//初始化ICMP的Socket
Socket socket =
new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.Icmp);
socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.SendTimeout, 1000);
// 得到Server EndPoint
try
{
ServerHE = Dns.GetHostByName(host);
}
catch (Exception)
{

return "没有发现主机";
}

// 把 Server IP_EndPoint转换成EndPoint
IPEndPoint ipepServer = new IPEndPoint(ServerHE.AddressList[0], 0);
EndPoint epServer = (ipepServer);

// 设定客户机的接收Endpoint
fromHE = Dns.GetHostByName(Dns.GetHostName());
IPEndPoint ipEndPointFrom = new IPEndPoint(fromHE.AddressList[0], 0);
EndPoint EndPointFrom = (ipEndPointFrom);

int PacketSize = 0;
IcmpPacket packet = new IcmpPacket();

// 构建要发送的包
packet.Type = ICMP_ECHO; //8
packet.SubCode = 0;
packet.CheckSum =0;
packet.Identifier = 45;
packet.SequenceNumber = 0;
int PingData = 24; // sizeof(IcmpPacket) - 8;
packet.Data = new Byte[PingData];

// 初始化Packet.Data
for (int i = 0; i <  PingData; i++)
{
packet.Data[i] = (byte)'#';
}

//Variable to hold the total Packet size
PacketSize = 32;
Byte[] icmp_pkt_buffer = new Byte[PacketSize];
Int32 Index = 0;
//again check the packet size
Index = Serialize(
packet,
icmp_pkt_buffer,
PacketSize,
PingData);
//if there is a error report it
if (Index == -1)
{
return "Error Creating Packet";

}
// convert into a UInt16 array

//Get the Half size of the Packet
Double double_length = Convert.ToDouble(Index);
Double dtemp = Math.Ceiling(double_length / 2);
int cksum_buffer_length = Index/2;
//Create a Byte Array
UInt16[] cksum_buffer = new UInt16[cksum_buffer_length];
//Code to initialize the Uint16 array
int icmp_header_buffer_index = 0;
for (int i = 0; i <  cksum_buffer_length; i++)
{
cksum_buffer[i] =
BitConverter.ToUInt16(icmp_pkt_buffer, icmp_header_buffer_index);
icmp_header_buffer_index += 2;
}
//Call a method which will return a checksum
UInt16 u_cksum = checksum(cksum_buffer, cksum_buffer_length);
//Save the checksum to the Packet
packet.CheckSum = u_cksum;

// Now that we have the checksum, serialize the packet again
Byte[] sendbuf = new Byte[PacketSize];
//again check the packet size
Index = Serialize(
packet,
sendbuf,
PacketSize,
PingData);
//if there is a error report it
if (Index == -1)
{
return "Error Creating Packet";

}

dwStart = System.Environment.TickCount; // Start timing
//send the Packet over the socket
if ((nBytes = socket.SendTo(sendbuf, PacketSize, 0, epServer)) == SOCKET_ERROR)
{
return "Socket Error: cannot send Packet";
}
// Initialize the buffers. The receive buffer is the size of the
// ICMP header plus the IP header (20 bytes)
Byte[] ReceiveBuffer = new Byte[256];
nBytes = 0;
//Receive the bytes
bool recd = false;
int timeout = 0;

//loop for checking the time of the server responding
while (!recd)
{
nBytes = socket.ReceiveFrom(ReceiveBuffer, 256, 0, ref EndPointFrom);
if (nBytes == SOCKET_ERROR)
{
return "主机没有响应";

}
else if (nBytes > 0)
{
dwStop = System.Environment.TickCount - dwStart; // stop timing
return "Reply from " + epServer.ToString() + " in "
+ dwStop + "ms.  Received: " + nBytes + " Bytes.";

}
timeout = System.Environment.TickCount - dwStart;
if (timeout > 1000)
{
return "超时";
}
}

//close the socket
socket.Close();
return "";
}
/// < summary>
///  This method get the Packet and calculates the total size
///  of the Pack by converting it to byte array
/// < /summary>
public static Int32 Serialize(IcmpPacket packet, Byte[] Buffer,
Int32 PacketSize, Int32 PingData)
{
Int32 cbReturn = 0;
// serialize the struct into the array
int Index = 0;

Byte[] b_type = new Byte[1];
b_type[0] = (packet.Type);

Byte[] b_code = new Byte[1];
b_code[0] = (packet.SubCode);

Byte[] b_cksum = BitConverter.GetBytes(packet.CheckSum);
Byte[] b_id = BitConverter.GetBytes(packet.Identifier);
Byte[] b_seq = BitConverter.GetBytes(packet.SequenceNumber);

Array.Copy(b_type, 0, Buffer, Index, b_type.Length);
Index += b_type.Length;

Array.Copy(b_code, 0, Buffer, Index, b_code.Length);
Index += b_code.Length;

Array.Copy(b_cksum, 0, Buffer, Index, b_cksum.Length);
Index += b_cksum.Length;

Array.Copy(b_id, 0, Buffer, Index, b_id.Length);
Index += b_id.Length;

Array.Copy(b_seq, 0, Buffer, Index, b_seq.Length);
Index += b_seq.Length;

// copy the data
Array.Copy(packet.Data, 0, Buffer, Index, PingData);
Index += PingData;
if (Index != PacketSize/* sizeof(IcmpPacket)  */)
{
cbReturn = -1;
return cbReturn;
}

cbReturn = Index;
return cbReturn;
}
/// < summary>
///  This Method has the algorithm to make a checksum
/// < /summary>
public static UInt16 checksum(UInt16[] buffer, int size)
{
Int32 cksum = 0;
int counter;
counter = 0;

while (size > 0)
{
UInt16 val = buffer[counter];

cksum += buffer[counter];
counter += 1;
size -= 1;
}

cksum = (cksum >> 16) + (cksum & 0xffff);
cksum += (cksum >> 16);
return (UInt16)(~cksum);
}
}
/// 类结束
/// < summary>
///  Class that holds the Pack information
/// < /summary>
public class IcmpPacket
{
public Byte Type;    // type of message
public Byte SubCode;    // type of sub code
public UInt16 CheckSum;   // ones complement checksum of struct
public UInt16 Identifier;      // identifier
public UInt16 SequenceNumber;     // sequence number
public Byte[] Data;

} // class IcmpPacket

}

C# ping命令执行：执行ping命令

首先，我们用使用Process类，来创建独立的进程，导入System.Diagnostics，

using System.Diagnostics;

实例一个Process类，启动一个独立进程

Process p = new Process();

Process类有一个StartInfo属性，这个是ProcessStartInfo类，包括了一些属性和方法，

下面我们用到了他的几个属性：

设定程序名

p.StartInfo.FileName = "cmd.exe";

关闭Shell的使用

p.StartInfo.UseShellExecute = false;

重定向标准输入

p.StartInfo.RedirectStandardInput = true;

重定向标准输出

p.StartInfo.RedirectStandardOutput = true;

重定向错误输出

p.StartInfo.RedirectStandardError = true;

设置不显示窗口

p.StartInfo.CreateNoWindow = true;

上面几个属性的设置是比较关键的一步。

既然都设置好了那就启动进程吧，

p.Start();

输入要执行的命令，这里就是ping了，

p.StandardInput.WriteLine("ping -n 1 www.iwebtrados.com.cn");

p.StandardInput.WriteLine("exit");

从输出流获取命令执行结果，

string strRst = p.StandardOutput.ReadToEnd();

C# ping命令实现：利用c#2.0新增的Ping类

这里我写的是一个窗体程序。首先添加textbox,listbox,button控件，其中textbox录入域名或IP，listbox显示结果.

在button1_click事件键入

private void button1_Click(object sender, EventArgs e)
{
Ping p1 = new Ping(); //只是演示，没有做错误处理
PingReply reply = p1.Send(this.textBox1.Text);//阻塞方式
displayReply(reply); //显示结果

}

private void displayReply(PingReply reply) //显示结果
{
StringBuilder sbuilder ;
if (reply.Status == IPStatus.Success)
{
sbuilder = new StringBuilder();
sbuilder.Append(string.Format("Address: {0} ", reply.Address.ToString ()));
sbuilder.Append(string.Format("RoundTrip time: {0} ", reply.RoundtripTime));
sbuilder.Append(string.Format("Time to live: {0} ", reply.Options.Ttl));
sbuilder.Append(string.Format("Don't fragment: {0} ", reply.Options.DontFragment));
sbuilder.Append(string.Format("Buffer size: {0} ", reply.Buffer.Length));
listBox1.Items.Add(sbuilder.ToString());
}

}

也可以做异步的处理，修改button1_click,并添加PingCompletedCallBack方法

private void button1_Click(object sender, EventArgs e)
{
Ping p1 = new Ping();
p1.PingCompleted += new PingCompletedEventHandler(this.PingCompletedCallBack);//设置PingCompleted事件处理程序
p1.SendAsync(this.textBox1.Text, null);
}

private void PingCompletedCallBack(object sender, PingCompletedEventArgs e)
{
if (e.Cancelled)
{
listBox1.Items.Add("Ping Canncel");
return;
}
if (e.Error != null)
{
listBox1.Items.Add(e.Error.Message);
return;

}
StringBuilder sbuilder;
PingReply reply = e.Reply;
if (reply.Status == IPStatus.Success)
{
sbuilder = new StringBuilder();
sbuilder.Append(string.Format("Address: {0} ", reply.Address.ToString()));
sbuilder.Append(string.Format("RoundTrip time: {0} ", reply.RoundtripTime));
sbuilder.Append(string.Format("Time to live: {0} ", reply.Options.Ttl));
sbuilder.Append(string.Format("Don't fragment: {0} ", reply.Options.DontFragment));
sbuilder.Append(string.Format("Buffer size: {0} ", reply.Buffer.Length));
listBox1.Items.Add(sbuilder.ToString());

}
}

怎么样，相比1、2方式，3是不是简单的多呀。

本文来自网络小筑的博客：《c#下实现ping操作》。