C# 通过Socket读取大量数据的示例

231 阅读 0 评论 153 点赞

我是靠谱客的博主危机小海豚，这篇文章主要介绍C# 通过Socket读取大量数据的示例，现在分享给大家，希望可以做个参考。

　　在C#中经常会用到Socket去接收和发送数据，而且也是非常方便的，有时候我们会向服务端去请求数据，如果返回的数据量很大，比如超过10M甚至是更多，那么该怎样去接收数据呢？下面以一个在项目中用到的实例去分析和解释这个问题，先看看下面的这段代码？

复制代码

/// <summary>
        /// 返回摄像头信息
        /// </summary>
        private void RcvCameraInfos(object obj)
        {
            string sourceIp = System.Configuration.ConfigurationSettings.AppSettings["SourceIP"].ToString();
            string sourcePort = System.Configuration.ConfigurationSettings.AppSettings["SourcePort"].ToString();
 
            Socket mysocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            IPEndPoint ipEndPoint = new IPEndPoint(IPAddress.Parse(sourceIp), int.Parse(sourcePort));
            mysocket.Connect(ipEndPoint);
 
            DateTime start = DateTime.Now;
 
            string s = "<?xml version="1.0" ?>";
            s += "<info  name="getcameracodematrixtable"></info>";
            byte[] buffer = System.Text.ASCIIEncoding.GetEncoding("GB2312").GetBytes(s);
            mysocket.Send(buffer);
 
            Action<string> OnCamraInfoRcvCompleted = obj as Action<string>;
             
            int recvsize = 0;
            int dataSize = 2048 * 1000;
            int ret = 0;
            byte[] datas = new byte[dataSize];
            SortedList<string, string[]> cameraDictionnary = new SortedList<string, string[]>();
            string xmlString = "";
            while (recvsize < dataSize)
            {
                ret = mysocket.Receive(datas, recvsize, dataSize - recvsize, SocketFlags.None);
                if (ret <= 0)
                {                   
                    break;
                }                  
                recvsize += ret;
                if (datas[recvsize - 1] == 0)
                {                   
                    break;
                }
                if (recvsize >= dataSize)
                {
                    byte[] buff2 = new byte[dataSize + 1024];
                    datas.CopyTo(buff2,0);
                    datas = buff2;
                    dataSize += 1024;               
                }
            }
            xmlString = System.Text.ASCIIEncoding.GetEncoding("GB2312").GetString(datas, 0, recvsize - 1);
            DateTime end = DateTime.Now;
            TimeSpan span = end - start;
            System.Windows.MessageBox.Show("总共花费时间："+span.TotalSeconds.ToString()+"秒");
            this._videoSourceXmlString = xmlString;
            if (cameraDictionnary != null)
            {
                if (OnCamraInfoRcvCompleted != null) OnCamraInfoRcvCompleted(xmlString);
            }
        }

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
/// <summary>
        /// 返回摄像头信息
        /// </summary>
        private void RcvCameraInfos(object obj)
        {
            string sourceIp = System.Configuration.ConfigurationSettings.AppSettings["SourceIP"].ToString();
            string sourcePort = System.Configuration.ConfigurationSettings.AppSettings["SourcePort"].ToString();
 
            Socket mysocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            IPEndPoint ipEndPoint = new IPEndPoint(IPAddress.Parse(sourceIp), int.Parse(sourcePort));
            mysocket.Connect(ipEndPoint);
 
            DateTime start = DateTime.Now;
 
            string s = "<?xml version="1.0" ?>";
            s += "<info  name="getcameracodematrixtable"/>";
            byte[] buffer = System.Text.ASCIIEncoding.GetEncoding("GB2312").GetBytes(s);
            mysocket.Send(buffer);
 
            Action<string> OnCamraInfoRcvCompleted = obj as Action<string>;
             
            int recvsize = 0;
            int dataSize = 2048 * 1000;
            int ret = 0;
            byte[] datas = new byte[dataSize];
            SortedList<string, string[]> cameraDictionnary = new SortedList<string, string[]>();
            string xmlString = "";
            while (recvsize < dataSize)
            {
                ret = mysocket.Receive(datas, recvsize, dataSize - recvsize, SocketFlags.None);
                if (ret <= 0)
                {                   
                    break;
                }                  
                recvsize += ret;
                if (datas[recvsize - 1] == 0)
                {                   
                    break;
                }
                if (recvsize >= dataSize)
                {
                    byte[] buff2 = new byte[dataSize + 1024];
                    datas.CopyTo(buff2,0);
                    datas = buff2;
                    dataSize += 1024;               
                }
            }
            xmlString = System.Text.ASCIIEncoding.GetEncoding("GB2312").GetString(datas, 0, recvsize - 1);
            DateTime end = DateTime.Now;
            TimeSpan span = end - start;
            System.Windows.MessageBox.Show("总共花费时间："+span.TotalSeconds.ToString()+"秒");
            this._videoSourceXmlString = xmlString;
            if (cameraDictionnary != null)
            {
                if (OnCamraInfoRcvCompleted != null) OnCamraInfoRcvCompleted(xmlString);
            }
        }

　　上述这段代码的核心是在While循环里面，我们首先接收的BufferSize，这里我们定义2048*1000个字节的大小，ret = mysocket.Receive(datas, recvsize, dataSize - recvsize, SocketFlags.None);通过Socket的这个同步方法来进行接收，datas是我们接收数据的Byte数组，recvsize是当前接收的字节起点(offset)，dataSize-recvsize是接收的缓冲区大小，在这个While循环里面，只要是recvsize < dataSize就会不停的去接收数据，当然如果数据量很大的话总有一个时刻recvsize >= dataSize,这个时候我怎就需要增加dataSize了，这里我们去动态增加1KB的大小，通过这样一个边界控制我们就能够去准确获取所有的数据了......

　　当然这种方式接收数据的缺点就是通过同步的方式，如果接收的数据太多的话，那么花费的时间可能就过长了，特别是在更新UI界面的时候，需要采用异步非阻塞的Socket来接收数据了，或者单独来开一个线程来进行数据接收，然后通过Application.Current.Dispatcher.BeginInvoke的方式来更新到UI上面，不然界面就会卡死，这个需要我们去认真分析......

　　另外一个当我们这样接收数据然后存入XML文件时，可能XML数据都是连在一起并不能主动换行，这个可以通过下面的方式来解决。

复制代码

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
private void SaveCurrentInfoToXML(string recevInfo)
       {
           string filePath=System.AppDomain.CurrentDomain.BaseDirectory+"CameraInfo.xml";
           XmlDocument xd = new XmlDocument();
           if (File.Exists(filePath))
           {
               xd.Load(filePath);              
           }
           else
           {
               XmlDeclaration xmlDec;
               XmlElement xmlEle;
               xmlDec = xd.CreateXmlDeclaration("1.0","UTF-8",null);
               xd.AppendChild(xmlDec);
               xmlEle = xd.CreateElement("Info");
               xd.AppendChild(xmlEle);
           }
           xd.LoadXml(recevInfo);
           XmlTextWriter xtw = new XmlTextWriter(filePath, Encoding.UTF8);
           xtw.Formatting = Formatting.Indented;
           xd.Save(xtw);
            
            
       }