string preUrl = "https://raasr.xfyun.cn/api/prepare";
string uploadUrl = "https://raasr.xfyun.cn/api/upload";
string mergeUrl = "https://raasr.xfyun.cn/api/merge";
string progressUrl = "https://raasr.xfyun.cn/api/getProgress";
string resultUrl = "https://raasr.xfyun.cn/api/getResult";
string app_id = "自己写";
string secretkey = "自己写";
string file_len = "";
string file_name = "";
int slice_num = 1;
string taskID = "";
string finalResult = "";
string slice_id = "aaaaaaaaaa";
string resPath = "";
string errorInfo = "";
// 参数自己补

// 这里直接调用方法即可获取最终结果 
// 写代码的时候是按顺序从第一个接口开始 获得成功返回值则向后调用
protected void Page_Load(object sender, EventArgs e) {
	string preResult = PreHandle();
	string newData = "";
	if (preResult != null && preResult != "")
	{
		UploadHandele(preResult);            
		if (finalResult != "")
		{
			//newData即finalResult即转写结果
			newData = finalResult;                 
		}
	}
}

//这里开始是一层一层实现的方法
// 可无视或者帮忙做点优化
	private string PreHandle()
    {
        string ts = "";
        string signa = "";
        string preHandleContent = "";
        string taskID = "";

        slice_num = 1;

        TimeSpan timeSpan = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
        ts = Convert.ToInt64(timeSpan.TotalSeconds).ToString();
        signa = GetSigna(app_id, ts);

        preHandleContent = "app_id=" + app_id + "&signa=" + signa + "&ts=" + ts + "&file_len=" + file_len + "&file_name=" + file_name + "&slice_num=" + slice_num + "&pd=edu";

        string postResult = "";

        while (postResult == "")
        {
            postResult = HttpPost(preUrl, preHandleContent, "application/x-www-form-urlencoded; charset=UTF-8");
        }

        JObject getTaskID = (JObject)JsonConvert.DeserializeObject(postResult);

        if (getTaskID["data"] != null)
        {
            taskID = getTaskID["data"].ToString();
        }
        return taskID;
    }

    private void UploadHandele(string preData)
    {
        string task_id = preData;

        byte[] uploadBuffer;

        uploadBuffer = fileTobyte(Server.MapPath(resPath));

        string ts = "";
        string signa = "";

        string uploadResult = "";

        TimeSpan timeSpanU = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
        ts = Convert.ToInt64(timeSpanU.TotalSeconds).ToString();
        signa = GetSigna(app_id, ts);


        uploadUrl += "?app_id=" + app_id + "&signa=" + signa + "&ts=" + ts + "&task_id=" + task_id + "&slice_id=" + slice_id;

        while (uploadResult == "")
        {
            uploadResult = HttpPostMulti(uploadUrl, uploadBuffer, file_name);
        }


         JObject getUploadResult = (JObject)JsonConvert.DeserializeObject(uploadResult);

            // 上传成功
          if (Convert.ToInt32(getUploadResult["ok"]) == 0)
          {
                MergeHandle(task_id);
          }
          else
          {
                //UploadHandele(preData);
                errorInfo += getUploadResult.ToString();
          }

    }

    private void MergeHandle(string MergeTaskID)
    {
        string ts = "";
        string signa = "";
        string mergeResult = "";

        TimeSpan timeSpanM = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
        ts = Convert.ToInt64(timeSpanM.TotalSeconds).ToString();
        signa = GetSigna(app_id, ts);

        string mergeContent = "";
        mergeContent = "app_id=" + app_id + "&signa=" + signa + "&ts=" + ts + "&task_id=" + MergeTaskID;

        while (mergeResult == "")
        {
            mergeResult = HttpPost(mergeUrl, mergeContent, "application/x-www-form-urlencoded; charset=UTF-8");
        }

        JObject getMergeResult = (JObject)JsonConvert.DeserializeObject(mergeResult);
        if (Convert.ToInt32(getMergeResult["ok"]) == 0)
        {
            ProgressHandle(MergeTaskID);
        } else
        {
            errorInfo += "合并失败";
        }
    }

    private void ProgressHandle(string progressTaskID)
    {
        string ts = "";
        string signa = "";
        int progressResult = -100;
        int timeCount = 0;
        TimeSpan timeSpanP = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
        ts = Convert.ToInt64(timeSpanP.TotalSeconds).ToString();
        signa = GetSigna(app_id, ts);

        string progressContent = "";
        progressContent = "app_id=" + app_id + "&signa=" + signa + "&ts=" + ts + "&task_id=" + progressTaskID;

        while (progressResult != 9 && progressResult != -1 && timeCount != 6)
        //while (progressResult != 9 && progressResult != -1)
        {

            string postProgressResult = "";
            while (postProgressResult == "")
            {
                postProgressResult = HttpPost(progressUrl, progressContent, "application/x-www-form-urlencoded; charset=UTF-8");
            }
            JObject getProgressResult = (JObject)JsonConvert.DeserializeObject(postProgressResult);
            if (Convert.ToInt32(getProgressResult["ok"]) == 0)
            {
                string progressResultData = "";
                progressResultData = getProgressResult["data"].ToString();
                JObject getStatus = (JObject)JsonConvert.DeserializeObject(progressResultData);
                progressResult = Convert.ToInt32(getStatus["status"]);
                if (progressResult != 9)
                {
                    timeCount ++;
                    Thread.Sleep(30000);
                }
            }
            else
            {
                progressResult = -1;
            }
        }

        if (progressResult == 9)
        {
            GetResultHandle(progressTaskID);
        } else
        {
            errorInfo += "进程失败";
        }
    }

    private string GetResultHandle(string resultTaskID)
    {
        string ts = "";
        string signa = "";
        string translateResult = "";

        TimeSpan timeSpanG = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
        ts = Convert.ToInt64(timeSpanG.TotalSeconds).ToString();
        signa = GetSigna(app_id, ts);

        string resultContent = "";
        resultContent = "app_id=" + app_id + "&signa=" + signa + "&ts=" + ts + "&task_id=" + resultTaskID;

        while (translateResult == "")
        {
            translateResult = HttpPost(resultUrl, resultContent, "application/x-www-form-urlencoded; charset=UTF-8");
        }

        JObject getTranslateResult = (JObject)JsonConvert.DeserializeObject(translateResult);
        if (Convert.ToInt32(getTranslateResult["ok"]) == 0)
        {
            string translateResultData = getTranslateResult["data"].ToString();
            JArray array = JArray.Parse(translateResultData);
            finalResult = array[0]["onebest"].ToString();
        } else
        {
            errorInfo += "结果失败";
        }
        return finalResult;
    }

    private string HttpPostMulti(string url, byte[] body, string fileName, Dictionary<string, string> headers = null, string contentType = null, int timeout = 60, Encoding encoding = null)
    {
        string result = string.Empty;
        HttpWebRequest request = null;
        HttpWebResponse response = null;
        Stream requestStream = null;
        Stream responseStream = null;

        try
        {
            request = (HttpWebRequest)HttpWebRequest.Create(url);
            request.Timeout = -1;
            CookieContainer cookieContainer = new CookieContainer();
            request.CookieContainer = cookieContainer;
            request.AllowAutoRedirect = true;
            request.Method = "POST";
            //对发送的数据不使用缓存【重要、关键】
            request.AllowWriteStreamBuffering = false;
            request.SendChunked = true;//支持分块上传
            string boundary = DateTime.Now.Ticks.ToString("X"); // 随机分隔线
            request.ContentType = "multipart/form-data;charset=utf-8;boundary=" + boundary;
            byte[] itemBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + boundary + "\r\n");
            byte[] endBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n");

            //请求头部信息 
            StringBuilder sbHeader = new StringBuilder(string.Format("Content-Disposition:form-data;name=\"content\";filename=\"{0}\"\r\nContent-Type:application/octet-stream\r\n\r\n", fileName));
            byte[] postHeaderBytes = Encoding.UTF8.GetBytes(sbHeader.ToString());

            //request.AddRange(body.Length);
            requestStream = request.GetRequestStream();

            requestStream.Write(itemBoundaryBytes, 0, itemBoundaryBytes.Length);
            requestStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);
            requestStream.Write(body, 0, body.Length);

            requestStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);

            response = (HttpWebResponse)request.GetResponse();
            responseStream = response.GetResponseStream();
            StreamReader streamReader = new StreamReader(responseStream, System.Text.Encoding.UTF8);
            result = streamReader.ReadToEnd();//返回信息
            streamReader.Close();
            streamReader.Dispose();
            requestStream.Dispose();
            responseStream.Close();
            responseStream.Dispose();
        }
        catch (Exception ex)
        {
            return "";
        }
        finally
        {
            
            //Dispose(request, response, requestStream, responseStream);
        }

        return result;
    }

    private byte[] fileTobyte(string filePath)
    {
        byte[] buffer;
        using (FileStream fs = File.OpenRead(filePath))
        {
            buffer = new byte[fs.Length];

            byte[] b = new byte[1024];
            //UTF8Encoding temp = new UTF8Encoding(true);
            int i = 0;
            while (fs.Read(b, 0, b.Length) > 0)
            {
                for (int j = 0; j < 1024; j++)
                {
                    if (i * 1024 + j < buffer.Length)
                    {
                        buffer[i * 1024 + j] = b[j];
                    }
                }
                i++;
            }
            fs.Close();
            fs.Dispose();
        }
        return buffer;
    }

    private string HttpPost(string postUrl, string postContent,string postContentType)
    {
        string result = "";
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(postUrl);
        req.Method = "POST";
        req.ContentType = postContentType;

        //#region 添加Post 参数
        byte[] data = Encoding.UTF8.GetBytes(postContent);
        req.ContentLength = data.Length;
        using (Stream reqStream = req.GetRequestStream())
        {
            reqStream.Write(data, 0, data.Length);
            reqStream.Close();
        }
        //#endregion

        HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
        Stream stream = resp.GetResponseStream();
        //获取响应内容
        using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
        {
            result = reader.ReadToEnd();
            reader.Close();
        }

        return result;
    }
    private string GetSigna(string appID, string theTS)
    {
        return HMACSHA1Text(StandardMD5(appID + theTS), secretkey);
    }
    private string StandardMD5(String s)
    {
        MD5 md5 = new MD5CryptoServiceProvider();
        byte[] bytes = System.Text.Encoding.UTF8.GetBytes(s);
        bytes = md5.ComputeHash(bytes);
        md5.Clear();

        string ret = "";
        for (int i = 0; i < bytes.Length; i++)
        {
            ret += Convert.ToString(bytes[i], 16).PadLeft(2, '0');
        }
        return ret.PadLeft(32, '0');
    }

    private string HMACSHA1Text(string text, string key)
    {
        //HMACSHA1加密
        HMACSHA1 hmacsha1 = new HMACSHA1();
        hmacsha1.Key = System.Text.Encoding.UTF8.GetBytes(key);

        byte[] dataBuffer = System.Text.Encoding.UTF8.GetBytes(text);
        byte[] hashBytes = hmacsha1.ComputeHash(dataBuffer);

        return Convert.ToBase64String(hashBytes);
    }