using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Collections;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.IO; namespace GPS定位收发控制
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = false;
}
private void Form1_Load(object sender, EventArgs e)
{ }
Thread mythread;
Socket socket; struct GpsInfo
{
public Double X, Y;
public string DateStr, TimeStr;
}
struct UDPOutInfo
{
public string SBID, OutType, OutStr;
public GpsInfo[] GpsInfos;
}
UDPOutInfo m_UDPOutInfo; public static IPAddress GetServerIP()
{
IPHostEntry ieh = Dns.GetHostByName(Dns.GetHostName());
return ieh.AddressList[0];
}
private void BeginListen()
{
IPAddress ServerIp = GetServerIP();
String tmpPos = "", tmpMsgFrom = "";
IPEndPoint iep = new IPEndPoint(ServerIp, int.Parse(tbLocalPort.Text));//定义一网络端点
socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);//定义一个Socket
socket.Bind(iep);//Socket与本地的一个终结点相关联
byte[] byteMessage = new byte[1024];
int recv;
while (true)
{
try
{
//得到客户机IP
IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);//定义要发送终端地址
EndPoint Remote = (EndPoint)(sender);
recv = socket.ReceiveFrom(byteMessage, ref Remote);//接受数据//无信号时，一直陷于此处于监听状态
tmpPos = Remote.ToString();
string[] tmpIPDK=new string[2];
tmpIPDK = tmpPos.Split(':');
IPlabel.Text = tmpIPDK[0];
DKlabel.Text = tmpIPDK[1];
string sTime = DateTime.Now.ToLongDateString() + " " + DateTime.Now.ToLongTimeString(); tmpMsgFrom = dis_package(byteMessage, "X2", recv); //不安全线程调用，为防止报错，之前必须加行System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = false;
rtbReceiveInfo.Items.Add(sTime + " 来自 " + tmpPos + " 的信息：" + "\r\n");
rtbReceiveInfo.Items.Add("收到字节内容:" + tmpMsgFrom + "\r\n");
string tmpRequest = tmpMsgFrom.Replace(" ", "");
GetGPSInfos(tmpRequest);
if (recv > 0)
{
//反馈应答信息
byteMessage = strToToHexByte(m_UDPOutInfo.OutStr);
socket.SendTo(byteMessage, byteMessage.Length, SocketFlags.None, Remote);
string sTime1 = DateTime.Now.ToLongDateString() + " " + DateTime.Now.ToLongTimeString();
richResponsion.Items.Add("应答时间:" + sTime1);
richResponsion.Items.Add("应答内容:" + m_UDPOutInfo.OutStr);
}
Array.Clear(byteMessage, 0, byteMessage.Length - 1);
}
catch (SocketException ex)
{
}
}
} // 字节数组转16进制字符串
public string dis_package(byte[] reb, string AType, int ANum)
{
string temp = "";
//foreach (byte b in reb)
// temp += b.ToString("X2") + " ";
for (int i = 0; i < ANum; i++)
temp += reb[i].ToString(AType);
if (temp != "")
temp = temp.Substring(0, temp.Length - 1);
return temp;
} private void GetGPSInfos(string AInStr)
{
int i = 0, tmpGPSNum = 0, tmpLengthX = 0, tmpLengthY = 0;
string tmpType = "", tmpACK = "", tmpGPSInfos = "";
ArrayList tmp_GPSInfoList = new ArrayList();
//初始化
m_UDPOutInfo.OutStr = "";
m_UDPOutInfo.SBID = "";
m_UDPOutInfo.OutType = "";
Array.Resize(ref m_UDPOutInfo.GpsInfos, 0);
//分析入口参数串
tmpType = AInStr.Substring(7, 1);//截取终端发送的请求字符串，得到相应的命令。
m_UDPOutInfo.OutType = tmpType;
m_UDPOutInfo.SBID = AInStr.Substring(8, 10);//截取终端发送的请求字符串，得到终端ID。 if (tmpType == "1") //是登录请求
{
//直接拼装返回串
m_UDPOutInfo.OutStr = "FE000E01" + m_UDPOutInfo.SBID + "0100000FFE";
}
else if (tmpType == "2") // 是数据响应请求
{
//GPS数据条数
tmpGPSNum = Convert.ToInt32(ToD(AInStr.Substring(18, 2), 16)); //ACK数据包自增序号
tmpACK = AInStr.Substring(20, 8); //先拼装返回串，再将GPS数据插入数据
m_UDPOutInfo.OutStr = "FE000F02" + m_UDPOutInfo.SBID + tmpACK + "00FE"; tmpGPSInfos = AInStr.Substring(28, AInStr.Length - 30);
tmp_GPSInfoList = GetInfos(tmpGPSInfos, tmpGPSNum); Array.Resize(ref m_UDPOutInfo.GpsInfos, tmpGPSNum);
foreach (string tmpGPS in tmp_GPSInfoList)
{
tmpLengthX = Convert.ToInt32(ToD(tmpGPS.Substring(12, 8), 16).Length) - 7;
tmpLengthY = Convert.ToInt32(ToD(tmpGPS.Substring(20, 8), 16).Length) - 7; m_UDPOutInfo.GpsInfos[i].X = Convert.ToDouble(ToD(tmpGPS.Substring(12, 8), 16).Insert(tmpLengthX, "."));
m_UDPOutInfo.GpsInfos[i].Y = Convert.ToDouble(ToD(tmpGPS.Substring(20, 8), 16).Insert(tmpLengthY, "."));
m_UDPOutInfo.GpsInfos[i].DateStr = ToD(tmpGPS.Substring(0, 2), 16) + "-" + ToD(tmpGPS.Substring(2, 2), 16) + "-" + ToD(tmpGPS.Substring(4, 2), 16);
m_UDPOutInfo.GpsInfos[i].TimeStr = ToD(tmpGPS.Substring(6, 2), 16) + ":" + ToD(tmpGPS.Substring(8, 2), 16) + ":" + ToD(tmpGPS.Substring(10, 2), 16);
i++;
}
}
else if (tmpType == "3") //是心跳请求
{
//直接拼装返回串
m_UDPOutInfo.OutStr = "FE000B03" + m_UDPOutInfo.SBID + "00FE";
} } //字符串转十六进制数组
private static byte[] strToToHexByte(string hexString)
{
hexString = hexString.Replace(" ", "");
if ((hexString.Length % 2) != 0)
hexString += " ";
byte[] returnBytes = new byte[hexString.Length / 2];
for (int i = 0; i < returnBytes.Length; i++)
returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);
return returnBytes;
} //实现十六进制转化为十进制
public static string ToD(string Num, int n)
{
char[] nums = Num.ToCharArray();
int d = 0;
for (int i = 0; i < nums.Length; i++)
{
string number = nums[i].ToString();
if (n == 16)
{
switch (number.ToUpper())
{
case "A":
number = "10";
break;
case "B":
number = "11";
break;
case "C":
number = "12";
break;
case "D":
number = "13";
break;
case "E":
number = "14";
break;
case "F":
number = "15";
break;
}
}
Double power = Math.Pow(Convert.ToDouble(n), Convert.ToDouble(nums.Length - (i + 1)));
d = d + Convert.ToInt32(number) * Convert.ToInt32(power);
}
return d.ToString();
} //平均截取GPS数据信息
public static ArrayList GetInfos(string Astr, int num)
{
ArrayList tmpGPSInfos = new ArrayList();
int a = Astr.Length;
int b = 40;
for (int i = 0; i < num; i++)
{
int start = (b * i);
tmpGPSInfos.Add(Astr.Substring(start, 40));
}
return tmpGPSInfos;
}
private void button1_Click(object sender, EventArgs e)
{
//Application.ExitThread();
if (socket != null)
socket.Close();//释放资源
if (mythread != null)
mythread.Abort();//中止线程
mythread = null;
socket = null;
btnStart.Enabled = true;
rtbReceiveInfo.Clear();
} private void btnStart_Click(object sender, EventArgs e)
{
btnStart.Enabled = false;
try
{
mythread = new Thread(new ThreadStart(BeginListen));
mythread.Start();
} catch (System.Exception er)
{
MessageBox.Show(er.Message, "完成", MessageBoxButtons.OK, MessageBoxIcon.Stop);
}
} }
}用的UDP协议，能跟终端通信上，能响应终端的登录请求，并成功应答，但是却得不到终端发送回来的GPS数据包，这是什么原因啊？
解决方案 »
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