csharp:百度语音识别

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public string API_id = "8888"; //你的ID        public string API_record = null;        public string API_record_format = "wav";        public string API_record_HZ = "16000";        public string API_key = "geovindu"; //你的KEY        public string API_secret_key = "55519"; //你的SECRRET_KEY        public string API_language = "zh";        public string API_access_token = null;        public string strJSON = "";          //录音        [DllImport("winmm.dll", EntryPoint = "mciSendString", CharSet = CharSet.Auto)]        public static extern int mciSendString(         string lpstrCommand,         string lpstrReturnString,         int uReturnLength,         int hwndCallback        );        /// <summary>        ///        /// </summary>        public Form1()        {            InitializeComponent();        }          /// <summary>        ///        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void Form1_Load(object sender, EventArgs e)        {            API_record=Application.StartupPath + "\\上班.wav";            API_access_token = getStrAccess(API_key, API_secret_key);          }          /// <summary>        ///        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void button1_Click(object sender, EventArgs e)        {            this.textBox2.Text = getStrText(API_id, API_access_token, API_language, API_record, API_record_format, API_record_HZ);          }        /// <summary>        ///        /// </summary>        /// <param name="para_API_key">你的KEY</param>        /// <param name="para_API_secret_key">你的SECRRET_KEY</param>        /// <returns></returns>        public string getStrAccess(string para_API_key, string para_API_secret_key)        {              //方法参数说明:                        //para_API_key:API_key(你的KEY)                        //para_API_secret_key(你的SECRRET_KEY)                        //方法返回值说明:                        //百度认证口令码,access_token                        string access_html = null;            string access_token = null;            string getAccessUrl = "https://openapi.baidu.com/oauth/2.0/token?grant_type=client_credentials" +"&client_id=" + para_API_key + "&client_secret=" + para_API_secret_key;            try            {                HttpWebRequest getAccessRequest = WebRequest.Create(getAccessUrl) as HttpWebRequest;                //getAccessRequest.Proxy = null;                                getAccessRequest.ContentType = "multipart/form-data";                getAccessRequest.Accept = "*/*";                getAccessRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)";                getAccessRequest.Timeout = 30000;//30秒连接不成功就中断                                 getAccessRequest.Method = "post";                HttpWebResponse response = getAccessRequest.GetResponse() as HttpWebResponse;                using (StreamReader strHttpComback = new StreamReader(response.GetResponseStream(), Encoding.UTF8))                {                    access_html = strHttpComback.ReadToEnd();                }            }            catch (WebException ex)            {                MessageBox.Show(ex.ToString());            }              JObject jo = JObject.Parse(access_html);            access_token = jo["access_token"].ToString();//得到返回的toke                        return access_token;        }        /// <summary>        ///        /// </summary>        /// <param name="para_API_id"></param>        /// <param name="para_API_access_token"></param>        /// <param name="para_API_language"></param>        /// <param name="para_API_record"></param>        /// <param name="para_format"></param>        /// <param name="para_Hz"></param>        /// <returns></returns>        public string getStrText(string para_API_id, string para_API_access_token, string para_API_language, string para_API_record, string para_format, string para_Hz)        {            //方法参数说明:                        //para_API_id: API_id (你的ID)            //para_API_access_token (getStrAccess(...)方法得到的access_token口令)            //para_API_language (你要识别的语言,zh,en,ct)            //para_API_record(语音文件的路径)            //para_format(语音文件的格式)            //para_Hz(语音文件的采样率 16000或者8000)                           //该方法返回值:                        //该方法执行正确返回值是语音翻译的文本,错误是错误号,可以去看百度语音文档,查看对应错误                        string strText = null;            string error = null;            FileInfo fi = new FileInfo(para_API_record);            FileStream fs = new FileStream(para_API_record, FileMode.Open);            byte[] voice = new byte[fs.Length];            fs.Read(voice, 0, voice.Length);            fs.Close();               string getTextUrl = "http://vop.baidu.com/server_api?lan=" + para_API_language + "&cuid=" + para_API_id + "&token=" + para_API_access_token;            HttpWebRequest getTextRequst = WebRequest.Create(getTextUrl) as HttpWebRequest;              /* getTextRequst.Proxy = null;            getTextRequst.ServicePoint.Expect100Continue = false;            getTextRequst.ServicePoint.UseNagleAlgorithm = false;            getTextRequst.ServicePoint.ConnectionLimit = 65500;            getTextRequst.AllowWriteStreamBuffering = false;*/               getTextRequst.ContentType = "audio /"+para_format+";rate="+para_Hz;            getTextRequst.ContentLength = fi.Length;            getTextRequst.Method = "post";            getTextRequst.Accept = "*/*";            getTextRequst.KeepAlive = true;            getTextRequst.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)";            getTextRequst.Timeout = 30000;//30秒连接不成功就中断                         using (Stream writeStream = getTextRequst.GetRequestStream())            {                writeStream.Write(voice, 0, voice.Length);            }               HttpWebResponse getTextResponse = getTextRequst.GetResponse() as HttpWebResponse;                   using (StreamReader strHttpText = new StreamReader(getTextResponse.GetResponseStream(), Encoding.UTF8))            {                strJSON = strHttpText.ReadToEnd();            }                             JObject jsons = JObject.Parse(strJSON);//解析JSON                             if (jsons["err_msg"].Value<string>() == "success.")            {                                     strText = jsons["result"][0].ToString();                    return strText;            }            else            {                    error = jsons["err_no"].Value<string>() + jsons["err_msg"].Value<string>();                    return error;            }                       }

　　参考： http://yuyin.baidu.com/docs/asr/57 

API请求方式基本说明

• 语音识别接口支持 POST 方式
• 目前 API 仅支持整段语音识别的模式，即需要上传整段语音进行识别
• 语音数据上传方式有两种：隐示发送和显示发送
• 原始语音的录音格式目前只支持评测 8k/16k 采样率 16bit 位深的单声道语音
• 压缩格式支持：pcm（不压缩）、wav、opus、speex、amr、x-flac
• 系统支持语言种类：中文（zh）、粤语（ct）、英文（en）
• 正式地址：http://vop.baidu.com/server_api