C#调用百度翻译实现翻译HALCON的示例

/// <summary>
/// 输入产数
/// </summary>
class InputQuery
{
    /// <summary>
    /// APP ID
    /// </summary>
    private static string appId = "2021xxxxxxx0626";
    /// <summary>
    /// 密钥
    /// </summary>
    private static string passWord = "cnblongsxtimefiles";


    /// <summary>
    /// 请求翻译query UTF-8编码
    /// </summary>
    public string Content { get; set; }
    /// <summary>
    /// 翻译源语言 可设置为auto
    /// </summary>
    public string From { get; set; }
    /// <summary>
    /// 翻译目标语言 不可设置为auto
    /// </summary>
    public string To { get; set; }
    /// <summary>
    /// APP ID
    /// </summary>
    public string AppId { get; set; }
    /// <summary>
    /// 随机数 可为字母或数字的字符串
    /// </summary>
    public string Salt { get; set; }
    /// <summary>
    /// 签名 appid+q+salt+密钥的MD5值
    /// </summary>
    public string Sign { get; set; }

    /// <summary>
    /// 构造函数
    /// </summary>
    /// <param name="content">翻译内容</param>
    /// <param name="fromStr">源语言</param>
    /// <param name="toStr">目标语言</param>
    public InputQuery(string content, string fromStr, string toStr)
    {
        Content = content;
        From = fromStr;
        To = toStr;
        AppId = appId;

        string randomNum = new Random().Next().ToString();
        string md5Sign = GetMD5(appId + content + randomNum + passWord).ToLower();
        Salt = randomNum;
        Sign = md5Sign;
    }

    /// <summary>
    /// 计算字符串的MD5值
    /// </summary>
    static string GetMD5(string source)
    {
        MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
        byte[] data = Encoding.UTF8.GetBytes(source);
        byte[] md5Data = md5.ComputeHash(data, 0, data.Length);
        md5.Clear();

        string destString = string.Empty;
        for (int i = 0; i < md5Data.Length; i++)
        {
            destString += Convert.ToString(md5Data[i], 16).PadLeft(2, '0');
        }
        destString = destString.PadLeft(32, '0');
        return destString;
    }
}

/// <summary>
/// 输出参数
/// </summary>
[DataContract]
class OutputResult
{
    
    /// <summary>
    /// 错误码 仅当出现错误时显示
    /// </summary>
    [DataMember(Name = "error_code")]
    public string Error_code { set; get; }

    /// <summary>
    /// 错误信息
    /// </summary>
    [DataMember(Name = "error_msg")]
    public string Error_msg { set; get; }

    /// <summary>
    /// 源语言 返回用户指定的语言，或者自动检测出的语种（源语言设为 auto 时）
    /// </summary>
    [DataMember(Name = "from")]
    public string From { set; get; }

    /// <summary>
    /// 目标语言 返回用户指定的目标语言
    /// </summary>
    [DataMember(Name = "to")]
    public string To { set; get; }

    /// <summary>
    /// 翻译结果 返回翻译结果，包括 src 和 dst 字段
    /// </summary>
    [DataMember(Name = "trans_result")]
    public TranslateContent[] Trans_result { set; get; }
}
/// <summary>
/// 翻译结果
/// </summary>
[DataContract]
class TranslateContent
{
    /// <summary>
    /// 原文
    /// </summary>
    [DataMember(Name = "src")]
    public string Src { set; get; }

    /// <summary>
    /// 译文
    /// </summary>
    [DataMember(Name = "dst")]
    public string Dst { set; get; }
}

public class GoodController
{
    public static readonly HttpClient HttpClient;

    static GoodController()
    {
        HttpClient = new HttpClient();
    }
}

/// <summary>
/// 百度通用翻译API工具类
/// </summary>
class Translate
{
    /*
     * 代码链接：https://www.cnblogs.com/timefiles/p/BaiduTranslateAPI.html
     * 创建时间：2021/06/26
     * 主页链接：https://www.cnblogs.com/timefiles/
     * 
     * 常用的语种代码：
     * 自动检测	auto	
     * 中文	zh	
     * 英语	en
     * 日语	jp
     */

    /// <summary>
    /// 英文翻译为中文
    /// </summary>
    /// <param name="content">翻译内容</param>
    /// <returns></returns>
    public static string EnToZh(string content)
    {
        string languageFrom = "en", languageTo = "zh";
        return GetTranslateResult(content, languageFrom, languageTo);
    }

    /// <summary>
    /// 获取翻译结果
    /// </summary>
    /// <param name="content">翻译内容</param>
    /// <param name="fromStr">源语言</param>
    /// <param name="toStr">目标语言</param>
    /// <returns></returns>
    static string GetTranslateResult(string content, string fromStr, string toStr)
    {
        InputQuery input = new InputQuery(content, fromStr, toStr);
        Uri uri = GetUri(input);
        var task = GetOutputResultAsync(uri);
        //个人认证后API的每秒请求量最高为10，异步意义不大，直接使用同步的方式
        OutputResult output = task.Result;
        if (output.Error_code == null)
        {
            return output.Trans_result[0].Dst;
        }
        else
        {
            throw new Exception("翻译异常，错误代码：" + output.Error_msg);
        }
    }

    /// <summary>
    /// 获取请求Uri
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    static Uri GetUri(InputQuery input)
    {
        var query = HttpUtility.ParseQueryString(string.Empty);
        query["q"] = input.Content;
        query["from"] = input.From;
        query["to"] = input.To;
        query["appid"] = input.AppId;
        query["salt"] = input.Salt;
        query["sign"] = input.Sign;

        //构造Uri，不建议直接拼字符串
        UriBuilder uriBur = new UriBuilder("http://api.fanyi.baidu.com/api/trans/vip/translate");
        uriBur.Query = query.ToString();
        //Uri会自动进行转义
        return uriBur.Uri;
    }

    /// <summary>
    /// 获取API返回的结果
    /// </summary>
    /// <param name="uri">请求的uri</param>
    /// <returns></returns>
    static async Task<OutputResult> GetOutputResultAsync(Uri uri)
    {
        OutputResult result = null;
        var response = await GoodController.HttpClient.GetStringAsync(uri);
        var ser = new DataContractJsonSerializer(typeof(OutputResult));
        using (var ms = new MemoryStream(Encoding.UTF8.GetBytes(response)))
        {
            result = (OutputResult)ser.ReadObject(ms);
        }
        return result;
    }
}

static void Main(string[] args)
{
    XmlDocument xd = new XmlDocument();
    xd.Load("index_examples_en_US.xml");
    //查找固定名称 节点名要从根节点开始写
    XmlNodeList nodelist = xd.DocumentElement.SelectNodes("/examples/example/desc");
    for (int i = 0; i < nodelist.Count; i++)
    {
        string desc = nodelist[i].InnerText;
        //百度翻译有时不太准确，建议保留原文
        nodelist[i].InnerText = Translate.EnToZh(desc)+"（"+ nodelist[i].InnerText+"）";               
        Console.WriteLine("翻译结果"+i+"：" + nodelist[i].InnerText);
        Console.WriteLine();
    }

    StreamWriter sw = new StreamWriter("index_examples_en_US_翻译.xml", false, new UTF8Encoding(false));
    //为了和原文件保存一致，原文件是使用的是"\n"换行
    sw.NewLine = "\n";
    xd.Save(sw);
    sw.Close();                  
    Console.WriteLine("完成");
    Console.Read();
}