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New Message on MumbaiUserGroup
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From: soniashish
Message 1 in Discussion
This is a pretty simple job, and can be broken down into the following subtasks:
Get text for translation and encode it into a HTTP POST request Send the data
to the web server, acting in effect as a .NET web browser Read the response
back into a big string Remove all the HTML and formatting and send the raw
translated string back to the client. [WebMethod] public string BabelFish(string
translationmode, string sourcedata) { }readonly string[] VALIDTRANSLATIONMODES = new
string[] {"en_zh", "en_fr", "en_de", "en_it", "en_ja", "en_ko", "en_pt", "en_es",
"zh_en", "fr_en", "fr_de", "de_en", "de_fr", "it_en", "ja_en", "ko_en", "pt_en",
"ru_en", "es_en"};
The code performs validation to check for a valid mode before passing it on to
Babelfish. After that, we create a POST request. The syntax for a HTTP POST request
looks something like this:POST /babelfish/tr/ HTTP/1.0 Content-Type:
application/x-www-form-urlencoded Content-Length: 51
lp=en_fr&tt=urltext&intl=1&doit=done&urltext=cheese
It's pretty simple, and if you want, you could use low-level sockets to write the data
to the server. Microsoft provides some better ways to do this however, and so we use
the HttpWebRequest class, which has lots of built-in features to make it easy to work
with HTTP connections.Uri uri = new Uri(BABELFISHURL); HttpWebRequest request =
(HttpWebRequest) WebRequest.Create(uri); request.Referer = BABELFISHREFERER; // Encode
all the sourcedata string postsourcedata; postsourcedata = "lp=" + translationmode +
"&tt=urltext&intl=1&doit=done&urltext=" + HttpUtility.UrlEncode(sourcedata);
request.Method = "POST"; request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = postsourcedata.Length; request.UserAgent = "Mozilla/4.0
(compatible; MSIE 6.0; Windows NT 5.1)"; Stream writeStream =
request.GetRequestStream(); UTF8Encoding encoding = new UTF8Encoding(); byte[] bytes =
encoding.GetBytes(postsourcedata); writeStream.Write(bytes, 0, bytes.Length);
writeStream.Close(); HttpWebResponse response = (HttpWebResponse)
request.GetResponse(); Stream responseStream = response.GetResponseStream();
StreamReader readStream = new StreamReader (responseStream, Encoding.UTF8); string
page = readStream.ReadToEnd();
We end up with a string containing the entire Babelfish page. As it stands, this is
about 99% noise (HTML tags, Altavista information, etc.), and 1% the translation we
were looking for. So we need a regular expression to find the translated text. By
looking at the HTML page, you will find the translation is contained between:<Div
style=padding:10px; lang=fr>translation here</div>
So the required regular expression looks like this (note: while testing my regular
expressions, I got lots of help from Regulator):<Div style=padding:10px;
lang=..>((?:.|\n)*?)</div>
This will match the whole <div>...</div> string. This is a fairly complex regular
expression, but basically, the . character matches everything, except for newlines,
hence the (.|\n) pattern, which means any character (except newlines) or new lines.
The brackets create a matching group, meaning that the text within the brackets
(namely the translation) will be put in its own group at index 1 (index 0 contains the
whole match).
The ?: pattern suppresses grouping: () normally creates a matching group: in this
case, we are only using the pattern to allow for line breaks in long translations.
Finally *? is a lazy regular expression, matching every character up to the first
instance of <div>. (If I had used plain *, the expression would be greedy, and would
chomp right up to the LAST </div>.)
Here's the code:Regex reg = new Regex(@"<Div style=padding:10px;
lang=..>(.*?)</div>"); MatchCollection matches = reg.Matches(page); if (matches.Count
!= 1 || matches[0].Groups.Count != 2) { return ERRORSTRINGSTART + "The HTML
returned from Babelfish " + "appears to have changed. Please check for" +
" an updated regular expression" + ERRORSTRINGEND; } return
matches[0].Groups[1].Value;
And subject to error checking, that's it! Using it
Download the code, and unzip it somewhere. Add a virtual directory called Translation
in IIS. Go to /translate.asmx and click Test, and enter some test data (say 'en_fr',
and 'cheese'). If it works, you are ready to use it in your web and Windows Forms
applications.
To use it in your app, add a Web Reference to the asmx, to the program you want to use
it in; Visual Studio will create a proxy reference for you, which you can then use to
perform translation.
Here's some sample code-behind:namespace test { using System; using
System.Data; using System.Drawing; using System.Web; using
System.Web.UI.WebControls; using localhost1; // assuming that's the reference
generated using System.Web.UI.HtmlControls; /// <summary> /// Summary
description for WebUserControl1. /// </summary> public class WebUserControl1 :
System.Web.UI.UserControl { protected
System.Web.UI.WebControls.DropDownList ddTranslationMode; protected
System.Web.UI.WebControls.TextBox txtText; protected
System.Web.UI.WebControls.Label lblTranslation; protected
System.Web.UI.WebControls.Button submitButton; private void Page_Load(object
sender, System.EventArgs e) { // Put user code to initialize the
page here } protected void submitButton_Click(object sender,
System.EventArgs e) { string translationMode =
this.ddTranslationMode.SelectedItem.Value; string translationText =
this.txtText.Text.Trim(); string translation = ""; try
{ Translate tr = new Translate(); translation =
tr.BabelFish(translationMode,translationText); } catch
(Exception exp) { translation = "There was an error
accessing the server: "
+ exp.Message; } this.lblTranslation.Text = translation;
} } }
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