Qt Google Translator

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This article shows how to use non-Ajax version of the google translator method to get our text translated.

Article Metadata

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Tested with

Devices(s): Emulator

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Compatibility

Platform(s): S60 5th Edition, Qt 4.6.2, Qt 4.7

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Article

Keywords: QHttp

Created: skumar_rao (21 Nov 2010)

Last edited: hamishwillee (11 Oct 2012)

Implementation

1. Create a QHttp member to transact with Google server.

   	http = new QHttp(this);
   	http->setHost("www.google.com");

2. Connect QHttp::done() member to our own class slot to grab transaction data from Google server.

   	connect(http, SIGNAL(done(bool)), this, SLOT(transaction_done()));

3. Prepare google translator service Url with to & from languages.

   	QString url = QString("/translate_a/t?client=t&sl=" + fro + "&tl=" + to);

4. Prepare text to be added to service.

   	QByteArray textByteArray("text=");
   	textByteArray.append( text.toUtf8() );

5. Prepare Request header

   	QHttpRequestHeader header = QHttpRequestHeader("POST", url, 1, 1);
   	header.setValue("Host", "www.google.com");
   	header.setValue("User-Agent", "Mozilla/5.0"); // ToDo: change to a value specific to device
   	header.setValue("Accept-Encoding", "deflate");
   	header.setContentLength(text.length());
   	header.setValue("Connection", "Close");

6. Invoke Http request with header and binary request

    
   	http->request(header,textByteArray);

7. Once the HTTP gets the response from the service read the http reply to a string

    
   	QString replyText;
   	replyText = replyText.fromUtf8( http->readAll() );

   

   Note: This data will be in HTML / Url Encoded data

8. Now we have to format this string to get the properly format data

       replyText = replyText.replace(QString("\\\""),QString("\""));
       replyText = replyText.replace(QString("\\n"),QString("\n"));
       replyText = replyText.replace(QString("\n "),QString("\n"));
       replyText = replyText.replace(QString("\\x3c"),QString("<"));
       replyText = replyText.replace(QString("\\x3e"),QString(">"));
    
       if( replyText.startsWith( QString("\"") ) ) {
           replyText = replyText.remove( replyText.length()-1, 1).remove(0,1);
       } else if( replyText.startsWith( QString("[") ) && replyText.endsWith( QString("]") ) ) {
           QStringList translatedList;
           replyText = replyText.replace(QString("]"),QString(""));
           translatedList = replyText.split(QString("["));
           replyText = QString("");
           for(int i=0,j=0;i<translatedList.count();i++) {
               if(translatedList.at(i)!="") {
                   if(j==0) {
                       QString translation = translatedList.at(i);
                       translation = translation.replace("\"","");
                       translation = translation.replace(",","");
                       replyText.append( translation );
                       replyText.append( "\n\n") ;
                   } else {
                       QString translation = translatedList.at(i);
                       QStringList translations = translation.split(",");
                       for(int y=0;y<translations.count();y++) {
                           translation = translations.at(y);
                           translation = translation.replace("\"","");
                           if(y==0) {
                               replyText.append( QString( translation + ": ") );
                           } else {
                               replyText.append( QString( "\t" + translation + "\n" ) );
                           }
                       }
                       replyText.append( "\n" );
                   }
                   j++;
               }
           }
       }

Result

Now replyText will contain formatted text that we can use in QTextEdit for display.