C#阿里云视频转码之消息接受

我们把视频传到阿里云去转码，转码是否成功怎么判断呢，这里就要用到阿里云的消息服务了。

我的做法是新建一个服务程序，然后安装到服务器上，这样就能开机自启，随时随地的接受消息， 另外我还给这个服务开启一个wcf通信接口，这样调一下这个，就能知道这个服务是否挂掉了。

首先还是要引用阿里云的Aliyun.MNS.dll，引用好了开整。

using Aliyun.MNS;using Aliyun.MNS.Model;using Aliyun.MNS.Sample.Model;using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Data.SqlClient;using System.Diagnostics;using System.Linq;using System.ServiceModel;using System.ServiceProcess;using System.Text;using System.Threading;using System.Threading.Tasks;namespace NiuRenVodMessage{    public partial class Service1 : ServiceBase    {        #region Private Properties        private static string NiuRen = System.Configuration.ConfigurationManager.AppSettings["niuren"];   //数据库连接字符串        private static string _accessKeyId = System.Configuration.ConfigurationManager.AppSettings["accessKeyId"]; //阿里云的accessKeyId        private static string _secretAccessKey = System.Configuration.ConfigurationManager.AppSettings["secretAccessKey"]; //阿里云的secretAccessKey        private static string _endpoint = System.Configuration.ConfigurationManager.AppSettings["endpoint"]; //阿里云消息服务的公网Endpoint        private static string _folder = System.Configuration.ConfigurationManager.AppSettings["folder"]; //阿里云存放的路径        private static string _queueName = System.Configuration.ConfigurationManager.AppSettings["queueName"]; //消息队列的名称        private static HashSet<string> _secretHashSet = new HashSet<string>();        public  static Thread myThread = new Thread(ReceiveMessage); //新开一个线程        private static bool isExit = false;        //private const string _queueNamePrefix = "my";        private const int _receiveTimes = 1; //一条记录        // private const int _receiveInterval = 2;        // private const int batchSize = 6;        private static string _receiptHandle;      static   ServiceHost serviceHost = new ServiceHost(typeof(Service2));        #endregion        public Service1()        {            InitializeComponent();        }        protected override void OnStart(string[] args)        {            Log4Net.Write("windows服务开始启动");            isExit = true;                        serviceHost.Open();            IMNS client = new Aliyun.MNS.MNSClient(_accessKeyId, _secretAccessKey, _endpoint);                        myThread.Start(client);        }        protected override void OnStop()        {            Log4Net.Write("windows服务退出");            isExit = false;            serviceHost.Close();                    }        public static void ReceiveMessage(object obj)        {            IMNS client = obj as IMNS;            while (isExit)            {                try                {                    var nativeQueue = client.GetNativeQueue(_queueName);                    for (int i = 0; i < _receiveTimes; i++)                    {                        var receiveMessageResponse = nativeQueue.ReceiveMessage();                        Message message = receiveMessageResponse.Message;                        byte[] bpath = Convert.FromBase64String(message.Body);                        string str = Encoding.UTF8.GetString(bpath);                        Result result = Newtonsoft.Json.JsonConvert.DeserializeObject<Result>(str);                        string pahtstr = "\"Object\": \"" + _folder + "/";                        if (result.MediaWorkflowExecution.Input.ToString().IndexOf(pahtstr) != -1)                        {                            int starSize = result.MediaWorkflowExecution.Input.ToString().IndexOf(pahtstr) + pahtstr.Length;                            int endSize = result.MediaWorkflowExecution.Input.ToString().IndexOf(".");                            result.MediaWorkflowExecution.InputFile = result.MediaWorkflowExecution.Input.ToString().Substring(starSize, endSize - starSize);                        }                        result.MediaWorkflowExecution.EndTime = message.EnqueueTime;                        if (!_secretHashSet.Contains(result.MediaWorkflowExecution.InputFile))                        {                            string sql = string.Format("update  [Vod] set  [RunId]='{0}', EndTime = '{1}' where InputFileName = '{2}'", result.MediaWorkflowExecution.RunId, result.MediaWorkflowExecution.EndTime, result.MediaWorkflowExecution.InputFile);                            SqlConnection connection = new SqlConnection(NiuRen);                            SqlCommand command = new SqlCommand(sql, connection);                            connection.Open();                            int res = command.ExecuteNonQuery();                            if (res > 0)                            {                                _secretHashSet.Add(result.MediaWorkflowExecution.InputFile);                            }                            connection.Close();                            Log4Net.Write(string.Format("成功转码{0}条数据,文件名：{1}", res,result.MediaWorkflowExecution.InputFile));                        }                        _receiptHandle = message.ReceiptHandle;                        //删除消息                        var deleteMessageResponse = nativeQueue.DeleteMessage(_receiptHandle);                        Thread.Sleep(1000);                    }                }                catch (Exception ex)                {                    Log4Net.Write("Receive message failed, exception info: " + ex.Message + ex.GetType().Name);                    Thread.Sleep(60000);                }            }        }    }}

Log4Net.Write这个是我自己写的一个记录文字输出到txt的函数，这就不贴了，另外新开一个wcf通信接口随时来观察此服务是否挂掉的相关代码也不贴了，就几行代码。
代码写的不好，献丑了。