private static String clientId = "**************"; // 百度云中开通对应服务应用的 API Key 建议开通应用的时候多选服务

    // 百度云中开通对应服务应用的 Secret Key

    private static String clientSecret = "***************";//注意不要加空格

    public void ProcessRequest(HttpContext context) {

        context.Response.ContentType = "text/plain";string token_ = getAccessToken();

        string return_font = general(token_, "123.jpg");

        //string json = JsonConvert.SerializeObject(return_font);

        context.Response.Write(return_font);

    }

    /// <summary>

    /// 获取token

    /// </summary>

    /// <returns></returns>

    public static String getAccessToken()

    {

        String authHost = "https://aip.baidubce.com/oauth/2.0/token";

        HttpClient client = new HttpClient();

        List<KeyValuePair<String, String>> paraList = new List<KeyValuePair<string, string>>();

        paraList.Add(new KeyValuePair<string, string>("grant_type", "client_credentials"));

        paraList.Add(new KeyValuePair<string, string>("client_id", clientId));

        paraList.Add(new KeyValuePair<string, string>("client_secret", clientSecret));

        HttpResponseMessage response = client.PostAsync(authHost, new FormUrlEncodedContent(paraList)).Result;

        String result = response.Content.ReadAsStringAsync().Result;

        string token_ = result.Split(',')[].Split(':')[];

        token_ = token_.Substring(, token_.Length-);

        return token_;

    }

/// <summary>

    /// 获取图片中的文字

    /// </summary>

    /// <param name="token"></param>

    /// <param name="image_path">图片路径</param>

    /// <returns></returns>

    public static string general(string token,string image_path)

    {

        string strbaser64 = base64(image_path);//将图片转为base64

        string host = "https://aip.baidubce.com/rest/2.0/ocr/v1/general?access_token=" + token;

        Encoding encoding = Encoding.Default;

        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(host);

        request.Method = "post";

        request.ContentType = "application/x-www-form-urlencoded";

        request.KeepAlive = true;

        String str = "image=" + HttpUtility.UrlEncode(strbaser64);

        byte[] buffer = encoding.GetBytes(str);

        request.ContentLength = buffer.Length;

        request.GetRequestStream().Write(buffer, , buffer.Length);

        HttpWebResponse response = (HttpWebResponse)request.GetResponse();

        StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);

        string result = reader.ReadToEnd();

        return result;

    }

    /// <summary>

    /// 将图片转为base64

    /// </summary>

    /// <param name="image_name"></param>

    /// <returns></returns>

    public static string base64(string image_name) {

        FileInfo file = new FileInfo(image_name);

        var stream = file.OpenRead();

        byte[] buffer = new byte[file.Length];

        //读取图片字节流

        stream.Read(buffer, , Convert.ToInt32(file.Length));

        return Convert.ToBase64String(buffer);

    }