C#使用Google翻译实现在线翻译
本文部分参考了GitHub中wadereye的代码，在源代码基础上修改了部分针对tkk的筛选及使用逻辑。
由于谷歌的tkk值规则一直在变，且api的url也不是固定的，所以做了配置类，方便修改。
全部代码
GoogleTranslate主类：
public static class GoogleTranslate
{
public static string TranslateChinese2English(string text)
{
return Translate(text, "zh-CN", "en");
}
/// 翻译后文本
public static string Translate(string text, string fromLanguage, string toLanguage)
{
CookieContainer cc = new CookieContainer();
string GoogleTransBaseUrl = ConfigManager.Instance.GetGoogleTranslate_Url();
var BaseResultHtml = GetResultHtml(GoogleTransBaseUrl, cc, "");
Regex re = new Regex(ConfigManager.Instance.GetGoogleTranslate_tkkRegex());
var TKK = re.Match(BaseResultHtml).ToString();//在返回的HTML中正则匹配TKK的值
//通过js获取tkk值，本js源码在根目录放置，源码在后文
var GetTkkJS = File.ReadAllText("./gettk.js");
var tk = ExecuteScript("tk(\"" + text + "\",\"" + TKK + "\")", GetTkkJS);
string googleTransUrl = string.Format(ConfigManager.Instance.GetGoogleTranslate_API(), fromLanguage, toLanguage, tk, HttpUtility.UrlEncode(text));
var ResultHtml = GetResultHtml(googleTransUrl, cc, ConfigManager.Instance.GetGoogleTranslate_Url());
return GetResultContent(ResultHtml);
}
/// 配置类
通过读取配置文件给主类传值，方便修改：
public class ConfigHelper
{
///
///返回*.exe.config文件中appSettings配置节的value项
///
///
///
///在*.exe.config文件中appSettings配置节增加一对键值对
///
///
///
public void AddAppConfig(string newKey, string newValue)
{
string file = System.Windows.Forms.Application.ExecutablePath;
Configuration config = ConfigurationManager.OpenExeConfiguration(file);
bool exist = false;
foreach (string key in config.AppSettings.Settings.AllKeys)
{
if (key == newKey)
{
exist = true;
}
}
if (exist)
{
config.AppSettings.Settings.Remove(newKey);
}
config.AppSettings.Settings.Add(newKey, newValue);
config.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection("appSettings");
}
}
public class ConfigManager : ConfigHelper
{
public static ConfigManager Instance = new ConfigManager();
public string GetGoogleTranslate_Url()
{
string value= GetAppConfig("GoogleTranslate_Url");
if (string.IsNullOrWhiteSpace(value))
value = "https://translate.google.cn/";
return value;
}
public string GetGoogleTranslate_API()
{
string value = GetAppConfig("GoogleTranslate_API");
if (string.IsNullOrWhiteSpace(value))
value = "https://translate.google.cn/translate_a/single?client=webapp&sl={0}&tl={1}&hl=zh-CN&dt=at&dt=bd&dt=ex&dt=ld&dt=md&dt=qca&dt=rw&dt=rm&dt=sos&dt=ss&dt=t&otf=1&pc=1&ssel=3&tsel=0&xid=45662847&kc=2&tk={2}&q={3}";
return value;
}
public string GetGoogleTranslate_tkkRegex()
{
string value = GetAppConfig("GoogleTranslate_tkkRegex");
if (string.IsNullOrWhiteSpace(value))
value = "(?<=tkk:')(.*?)(?=')";
return value;
}
}
App.config配置：
<appSettings>
<add key="GoogleTranslate_Url" value="https://translate.google.cn/"></add>
<add key="GoogleTranslate_API" value="https://translate.google.cn/translate_a/single?client=webapp&sl={0}&tl={1}&hl=zh-CN&dt=at&dt=bd&dt=ex&dt=ld&dt=md&dt=qca&dt=rw&dt=rm&dt=sos&dt=ss&dt=t&otf=1&pc=1&ssel=3&tsel=0&xid=45662847&kc=2&tk={2}&q={3}"></add>
<add key="GoogleTranslate_tkkRegex" value="(?<=tkk:')(.*?)(?=')"></add>
</appSettings>
gettk.js
本js文件保存在根目录（文件名：gettk.js），供GoogleTranslate类调用，获取tkk：
//该文件用来获取谷歌翻译tkk值，不能删除，根据谷歌服务的变化有可能需要修改部分代码
var b = function (a, b) {
for (var d = 0; d < b.length - 2; d += 3) {
var c = b.charAt(d + 2),
c = "a" <= c ? c.charCodeAt(0) - 87 : Number(c),
c = "+" == b.charAt(d + 1) ? a >>> c : a << c;
a = "+" == b.charAt(d) ? a + c & 4294967295 : a ^ c
}
return a
}
var tk = function (a, TKK) {
for (var e = TKK.split("."), h = Number(e[0]) || 0, g = [], d = 0, f = 0; f < a.length; f++) {
var c = a.charCodeAt(f);
128 > c ? g[d++] = c : (2048 > c ? g[d++] = c >> 6 | 192 : (55296 == (c & 64512) && f + 1 < a.length && 56320 == (a.charCodeAt(f + 1) & 64512) ? (c = 65536 + ((c & 1023) << 10) + (a.charCodeAt(++f) & 1023), g[d++] = c >> 18 | 240, g[d++] = c >> 12 & 63 | 128) : g[d++] = c >> 12 | 224, g[d++] = c >> 6 & 63 | 128), g[d++] = c & 63 | 128)
}
a = h;
for (d = 0; d < g.length; d++) a += g[d], a = b(a, "+-a^+6");
a = b(a, "+-3^+b+-f");
a ^= Number(e[1]) || 0;
0 > a && (a = (a & 2147483647) + 2147483648);
a %= 1E6;
return a.toString() + "." + (a ^ h)
}
使用
直接调用主类的公用方法即可：
GoogleTranslate.TranslateChinese2English("需要翻译内容");
示例：
private void button1_Click(object sender, EventArgs e)
{
richTextBox2.Text = GoogleTranslate.TranslateChinese2English(richTextBox1.Text);
}
