C#--WinForm调用COM实现语音功能

Windows 系统调用.COM.微软语言引擎简单应用（C#）
  本文主要讲述，如何调用微软的语言引擎...

应用场景
  如看图识字软件等等....(我可不是作语言软件的、这个子是做着玩的)

涉及技术
  动态调用Com对象（全反射、没有引用com ocx）
  取得系统存在的各种语言引擎
  使用引擎进行朗读
  使用引擎进行保存声音


程序图列:

主要功能描述

实列变量等，构造函授等

  取得所有的 识别对象模块集合，放入下拉框

代码

  object _spVoiceCls =
null;    //保存朗读用的 SAPI.SpVoice

const
int SpFlags =
1; //SpeechVoiceSpeakFlags.SVSFlagsAsyn

object _oISpeechObjectTokens =
null; //保存 SAPI.ISpeechObjectTokens 就是系统有的语音引擎集合

int TokensCount =
0; // 语音引擎集合 数
        DictionaryEntry[] _deTokens=null; //榜定下拉框用的

        public MainForm()
        {
            InitializeComponent();
            this.HandleDestroyed +=
new EventHandler(Form1_HandleDestroyed);
        }

private
void Form1_Load(object sender, EventArgs e)
        {

            InitSAPI();
            
        }

系统事件:程序加载

  取得所有的 识别对象模块集合，放入下拉框

代码

  void InitSAPI()
        {
            //创建语音对象朗读用
            _spVoiceCls = CreateComObject("SAPI.SpVoice");

            if (_spVoiceCls == null)
            {

                MessageBox.Show("您的系统没有,微软语音组件");
                Application.Exit();
            }
            else
            {//取得所有的 识别对象模块集合

                
                _oISpeechObjectTokens = CallComMethod("GetVoices", _spVoiceCls); //取得SAPI.ISpeechObjectTokens
                //识别对象集合 Count;
                object r = GetComPropery("Count", _oISpeechObjectTokens);
                if (r is int)
                {

                    TokensCount = (int)r;

                    if (TokensCount > 0)
                    {
                        //取得全部语音识别对象模块，及名称，以被以后使用
                        _deTokens = new DictionaryEntry[TokensCount];
                        for (int i = 0; i < TokensCount; i++)
                        {
                            //从集合中取出单个 识别对象模块
                            object oSpObjectToken = CallComMethod("Item", _oISpeechObjectTokens, i); //返回 SAPI.SpObjectToken
                            //取名称
                            string Description = CallComMethod("GetDescription", oSpObjectToken) as string;
                            //放到 DictionaryEntry 对象中，key 是 识别对象模块，value 是名称
                            _deTokens= new DictionaryEntry(oSpObjectToken, Description);

                        }
                        //邦定到 下拉框
                        cboxTokens.DisplayMember = "Value";
                        cboxTokens.ValueMember = "Key";
                        cboxTokens.DataSource = _deTokens;
                        cboxTokens.SelectedIndex = 0;
                    }

                }

            }

        }

用户事件:朗读

  朗读输入的文本信息

代码

private void btnSynthesis_Click(object sender, EventArgs e)
        {
            string msg = rTxtMsg.Text.Trim();
            if (msg.Length != 0)
            {

                if (_spVoiceCls != null)
                {
                    
                    //设置语言引擎
                    SetComProperty("Voice", _spVoiceCls, cboxTokens.SelectedValue);
                    //调用Speak 函数，msg 是要播放的文本，1 是异步播放,因为是异步的 com 对象不立刻释放
                    CallComMethod("Speak", _spVoiceCls, msg, SpFlags);

                }
            }

        }

用户事件:保存声音

  将输入的文本信息生成音频文件保存到文件

代码
  

private void Save()
        {
            string msg = rTxtMsg.Text.Trim();
            if (msg.Length != 0)
            {
                using (SaveFileDialog sfd = new SaveFileDialog())
                {
                    sfd.Filter = "wav 文件 (*.wav)|*.wav";
                    sfd.RestoreDirectory = true;
                    if (sfd.ShowDialog() == DialogResult.OK)
                    {
                        /*
                        Enum SpeechStreamFileMode;
                              SSFMOpenForRead = 0;
                              SSFMOpenReadWrite = 1;
                              SSFMCreate = 2;
                              SSFMCreateForWrite = 3;

                        */

                        int SpFileMode = 3;// SpeechStreamFileMode.SSFMCreateForWrite                    

                        object oSpFileStream = CreateComObject("SAPI.SpFileStream"); //创建 SAPI.SpFileStream

                        object oSpVoice = CreateComObject("SAPI.SpVoice"); //创建 SAPI.SpVoice

                        
                        try
                        {
                            CallComMethod("Open", oSpFileStream, sfd.FileName, SpFileMode, false); //打开流
                            SetComProperty("Voice", oSpVoice, cboxTokens.SelectedValue); //设置 Voice 属性，让谁朗读
                            SetComProperty("AudioOutputStream", oSpVoice, oSpFileStream); //设置流

                            CallComMethod("Speak", oSpVoice, msg, SpFlags); //调用 Speak

                            CallComMethod("WaitUntilDone", oSpVoice, Timeout.Infinite); //等
                            CallComMethod("Close", oSpFileStream); //关闭流

                            MessageBox.Show("保存成功");
                        }                        
                        finally
                        {
                            Marshal.ReleaseComObject(oSpVoice);
                            Marshal.ReleaseComObject(oSpFileStream);
                        }

                        
                        

                    }

                }
            }

        }
        private void btnSave_Click(object sender, EventArgs e)
        {

            try
            {
                btnSave.Enabled = false;
                Save();

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                btnSave.Enabled = true;
            }

        }

调用com组件，功能函数

  自己写的一些帮助函数可以方便调用反射，要不太郁闷（如果是VB 就不用如此费尽了）


#region 调用com组件，功能通用函数
        /// <summary>
        /// 设置属性
        /// </summary>
        /// <param name="name"></param>
        /// <param name="o"></param>
        /// <param name="vlaue"></param>
        private static void SetComProperty(string name, object o, object vlaue)
        {
            Type t = o.GetType();
            t.InvokeMember(name, BindingFlags.Instance | BindingFlags.SetProperty, null, o, new
object[] { vlaue });
        }
        /// <summary>
        /// 取得属性
        /// </summary>
        /// <param name="name"></param>
        /// <param name="o"></param>
        /// <returns></returns>
        private static object GetComPropery(string name, object o)
        {
            Type t = o.GetType();
            return t.InvokeMember(name, BindingFlags.Instance | BindingFlags.GetProperty, null, o, null);
        }
        /// <summary>
        /// 调用方法函授
        /// </summary>
        /// <param name="name"></param>
        /// <param name="o"></param>
        /// <param name="parms"></param>
        /// <returns></returns>
        private static object CallComMethod(string name, object o, params object[] parms)
        {
            Type t = o.GetType();

            return t.InvokeMember(name, BindingFlags.Instance | BindingFlags.InvokeMethod, null, o, parms);
        }
        /// <summary>
        /// 创建 com 对象
        /// </summary>
        /// <param name="FromProgID"></param>
        /// <returns></returns>
        private static object CreateComObject(string FromProgID)
        {
            Type comType = Type.GetTypeFromProgID(FromProgID);
            object rVar = null;
            if (comType != null)
                rVar = System.Activator.CreateInstance(comType);

            return rVar;
        }
        #endregion

释放com对象
  很简单的就一行即可

代码
void Form1_HandleDestroyed(object sender, EventArgs e)
        {
            //释放com对象
            Marshal.ReleaseComObject(_spVoiceCls);

        }


说明 关于 SAPI 对象的具体情参考，msdn Microsoft Speech SDK 部分是英文的帮助（VS2003 和 VS2005 的都有，ms 网站上好像也有），我英文也不好没法翻译抱歉，我用的这些函数有的是在 ms 网站上看到的有的是自己用对象浏览器慢慢找的....