How to use System.Speech on non-English Win Vista Business

Question

I´d like to try Speech recognition to controlling program. I wrote test program in C# and when I´m debugging this, an error occurred every time -

System.Runtime.InteropServices.COMException (0x80004005): Calling part of COM return error HRESULT E_FAIL.* 
in System.Speech.Recognition.RecognizerBase.Initialize(SapiRecognizer recognizer, Boolean inproc)
in System.Speech.Recognition.SpeechRecognitionEngine.get_RecoBase()
in System.Speech.Recognition.SpeechRecognitionEngine.LoadGrammar(Grammar grammar)

It looks the error is caused by engine.LoadGrammar(new DictationGrammar()); On my notebook I installed CZECH OS Vista, and maybe this is the problem that speech recognition language is not the same as OS language.

Is there a way how to developing with system.speech in non english OS, or am I wrong in some step? There is no problem in language, I´d like use english for speech recognizing, but, I cannot get english Vista or MUI language pack.

Full code is below.

Thanks a lot!

using System;
using System.Windows;
using System.Speech.Recognition;

namespace rozpoznani_reci_WPF
{
   public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            SpeechRecognitionEngine engine = new SpeechRecognitionEngine();

            try
                {
                    engine.LoadGrammar(new DictationGrammar());
                    engine.SetInputToDefaultAudioDevice();
                    engine.SpeechRecognized += new EventHandler<SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);
                }

            catch(Exception e)
                {
                    //MessageBox.Show(e.ToString());
                    textBox1.Text = e.ToString();
                 }
            }

        void recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
        {
            if (e.Result != null)
            {
                textBox1.Text = e.Result.Text + "  ";
            }
        }
      }
    }

Answer 1

According to the MSDN documentation on DictationGrammar , the argument-free constructor

Initializes a new instance of the DictationGrammar class for the default dictation grammar provided by Windows Desktop Speech Technology.

Is there a Czech language DicationGrammar class available on your machine? If not, you need to create one and use the other constructor DictationGrammar(String) and load one from a URI. You can also use GrammarBuilder to construct your own and load it instead using SpeechRecognizer.LoadGrammar() .

You might also find this link useful; it's from 2008, but you did ask about Vista. :-)