本篇C#编程教程将为大家讲解C#编程的知识点，看完这篇文章会让你对C#编程的知识点有更加清晰的理解和运用。

这篇文章主要是一个应用，使用udp传送语音和文本等信息。在这个系统中没有服务端和客户端，相互通讯都是直接相互联系的。能够很好的实现效果。

语音获取

要想发送语音信息，首先得获取语音，这里有几种方法，一种是使用DirectX的DirectXsound来录音，我为了简便使用一个开源的插件NAudio来实现语音录取。 在项目中引用NAudio.dll

//------------------录音相关-----------------------------

        private IWaveIn waveIn;

        private WaveFileWriter writer;

        private void LoadWasapiDevicesCombo()

        {

            var deviceEnum = new MMDeviceEnumerator();

            var devices = deviceEnum.EnumerateAudioEndPoints(DataFlow.Capture, DeviceState.Active).ToList();

            comboBox1.DataSource = devices;

            comboBox1.DisplayMember = "FriendlyName";

        }

        private void CreateWaveInDevice()

        {

            waveIn = new WaveIn();

            waveIn.WaveFormat = new WaveFormat(8000, 1);

            waveIn.DataAvailable += OnDataAvailable;

            waveIn.RecordingStopped += OnRecordingStopped;

        }

        void OnDataAvailable(object sender, WaveInEventArgs e)

        {

            if (this.InvokeRequired)

            {

                this.BeginInvoke(new EventHandler<WaveInEventArgs>(OnDataAvailable), sender, e);

            }

            else

            {

                writer.Write(e.Buffer, 0, e.BytesRecorded);

                int secondsRecorded = (int)(writer.Length / writer.WaveFormat.AverageBytesPerSecond);

                if (secondsRecorded >= 10)//最大10s

                {

                    StopRecord();

                }

                else

                {

                    l_sound.Text = secondsRecorded + " s";

                }

            }

        }

        void OnRecordingStopped(object sender, StoppedEventArgs e)

        {

            if (InvokeRequired)

            {

                BeginInvoke(new EventHandler<StoppedEventArgs>(OnRecordingStopped), sender, e);

            }

            else

            {

                FinalizeWaveFile();

            }

        }

        void StopRecord()

        {

            AllChangeBtn(btn_luyin, true);

            AllChangeBtn(btn_stop, false);

            AllChangeBtn(btn_sendsound, true);

            AllChangeBtn(btn_play, true);

            //btn_luyin.Enabled = true;

            //btn_stop.Enabled = false;

            //btn_sendsound.Enabled = true;

            //btn_play.Enabled = true;

            if (waveIn != null)

                waveIn.StopRecording();

            //Cleanup();

        }

private void Cleanup()

        {

            if (waveIn != null)

            {

                waveIn.Dispose();

                waveIn = null;

            }

            FinalizeWaveFile();

        }

        private void FinalizeWaveFile()

        {

            if (writer != null)

            {

                writer.Dispose();

                writer = null;

            }

        }

 //开始录音

        private void btn_luyin_Click(object sender, EventArgs e)

        {

            btn_stop.Enabled = true;

            btn_luyin.Enabled = false;

            if (waveIn == null)

            {

                CreateWaveInDevice();

            }

            if (File.Exists(soundfile))

            {

                File.Delete(soundfile);

            }

            writer = new WaveFileWriter(soundfile, waveIn.WaveFormat);

            waveIn.StartRecording();

        }

上面的代码实现了录音，并且写入文件p2psound_A.wav

语音发送

获取到语音后我们要把语音发送出去

当我们录好音后点击发送，这部分相关代码是

 MsgTranslator tran = null;

 public Form1()

        {

            InitializeComponent();

            LoadWasapiDevicesCombo();//显示音频设备

            Config cfg = SeiClient.GetDefaultConfig();

            cfg.Port = 7777;

            UDPThread udp = new UDPThread(cfg);

            tran = new MsgTranslator(udp, cfg);

            tran.MessageReceived += tran_MessageReceived;

            tran.Debuged += new EventHandler<DebugEventArgs>(tran_Debuged);

        }

private void btn_sendsound_Click(object sender, EventArgs e)

        {

            if (t_ip.Text == "")

            {

                MessageBox.Show("请输入ip");

                return;

            }

            if (t_port.Text == "")

            {

                MessageBox.Show("请输入端口号");

                return;

            }

            string ip = t_ip.Text;

            int port = int.Parse(t_port.Text);

            string nick = t_nick.Text;

            string msg = "语音消息";

            IPEndPoint remote = new IPEndPoint(IPAddress.Parse(ip), port);

            Msg m = new Msg(remote, "zz", nick, Commands.SendMsg, msg, "Come From A");

            m.IsRequireReceive = true;

            m.ExtendMessageBytes = FileContent(soundfile);

            m.PackageNo = Msg.GetRandomNumber();

            m.Type = Consts.MESSAGE_BINARY;

            tran.Send(m);

        }

private byte[] FileContent(string fileName)

        {

            FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);

            try

            {

                byte[] buffur = new byte[fs.Length];

                fs.Read(buffur, 0, (int)fs.Length);

                return buffur;

            }

            catch (Exception ex)

            {

                return null;

            }

            finally

            {

                if (fs != null)

                {

                    //关闭资源

                    fs.Close();

                }

            }

        }

如此一来我们就把产生的语音文件发送出去了

语音的接收与播放

其实语音的接收和文本消息的接收没有什么不同，只不过语音发送的时候是以二进制发送的，因此我们在收到语音后 就应该写入到一个文件里面去，接收完成后，播放这段语音就行了。

下面这段代码主要是把收到的数据保存到文件中去，这个函数式我的NetFrame里收到消息时所触发的事件，在文章前面提过的那篇文章里

void tran_MessageReceived(object sender, MessageEventArgs e)

        {

            Msg msg = e.msg;

            if (msg.Type == Consts.MESSAGE_BINARY)

            {

                string m = msg.Type + "->" + msg.UserName + "发来二进制消息!";

                AddServerMessage(m);

                if (File.Exists(recive_soundfile))

                {

                    File.Delete(recive_soundfile);

                }

                FileStream fs = new FileStream(recive_soundfile, FileMode.Create, FileAccess.Write);

                fs.Write(msg.ExtendMessageBytes, 0, msg.ExtendMessageBytes.Length);

                fs.Close();

                //play_sound(recive_soundfile);

                ChangeBtn(true);

            }

            else

            {

                string m = msg.Type + "->" + msg.UserName + "说:" + msg.NormalMsg;

                AddServerMessage(m);

            }

        }

收到语音消息后，我们要进行播放，播放时仍然用刚才那个插件播放

//--------播放部分----------

        private IWavePlayer wavePlayer;

        private WaveStream reader;

        public void play_sound(string filename)

        {

            if (wavePlayer != null)

            {

                wavePlayer.Dispose();

                wavePlayer = null;

            }

            if (reader != null)

            {

                reader.Dispose();

            }

            reader = new MediaFoundationReader(filename, new MediaFoundationReader.MediaFoundationReaderSettings() { SingleReaderObject = true });

            if (wavePlayer == null)

            {

                wavePlayer = new WaveOut();

                wavePlayer.PlaybackStopped += WavePlayerOnPlaybackStopped;

                wavePlayer.Init(reader);

            }

            wavePlayer.Play();

        }

        private void WavePlayerOnPlaybackStopped(object sender, StoppedEventArgs stoppedEventArgs)

        {

            if (stoppedEventArgs.Exception != null)

            {

                MessageBox.Show(stoppedEventArgs.Exception.Message);

            }

            if (wavePlayer != null)

            {

                wavePlayer.Stop();

            }

            btn_luyin.Enabled = true;

        }private void btn_play_Click(object sender, EventArgs e)

        {

            btn_luyin.Enabled = false;

            play_sound(soundfile);

        }

在上面演示了接收和发送一段语音消息的界面

技术总结

主要用到的技术就是UDP和NAudio的录音和播放功能

其中用到的UDP传输类我放在了github上面 地址在我的博客左边的个人介绍里有地址  项目地址 https://github.com/zhujunxxxxx/ZZNetFrame

希望这篇文章能够提供一个思路。

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