changelanguage.cs

微软的行业应用解决方案示例

using System;
using System.Linq;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Globalization;
using Microsoft.Win32;
using HardwareDistributor.Properties;
using HardwareDistributor.Utilities;

namespace HardwareDistributor.UI
{
    public partial class ChangeLanguage : Form
    {
        #region Members

        static private Dictionary<string, int> _languageMappings = new Dictionary<string, int>();
        private int _currentLanguageLCID;		
		private static bool _isMUI = false;

        #endregion

        #region Constructors

        public ChangeLanguage()
        {
            InitializeComponent();

			// We are removing both the Control Box and the Minimize Box, so that we don't
			// have to handle these in our code. This is not necessary in Windows Mobile Standard,
			// but we are writing this code so that it works on all platforms without any changes
			// or any recompiling.
			this.ControlBox = false;
			this.MinimizeBox = false;

            GetLanguages();

            DisplayLanguages();
        }

        #endregion

        #region Event Handlers

        /// <summary>
        /// Language changed
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void menuOk_Click(object sender, EventArgs e)
        {
            //get the language selected
            string selectedLanguage = LanguageComboBox.SelectedItem.ToString();

            //lookup the language id for this
            int languageId = _languageMappings[selectedLanguage];

            //only if the language has changed
            if (languageId != _currentLanguageLCID)
            {
                //check with user if he wants
                DialogResult result = MessageBox.Show(
                                Resources.LanguageChangeMessage,
                                Resources.LanguageChangeCaption,
                                MessageBoxButtons.YesNo,
                                MessageBoxIcon.Exclamation,
                                MessageBoxDefaultButton.Button1);

                //if user confirms action to reset device
                if (result == DialogResult.Yes)
                {
                    ResetDevice(languageId);
                }
            }

            //in case no change required, simply shutdown the form
            this.Close();

        }

        /// <summary>
        /// cancel the operation
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void menuCancel_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        #endregion

        #region Methods

		public static int LocaleCallback(String s)
		{
			int languageLCID = int.Parse(s, NumberStyles.AllowHexSpecifier);

			string languageName = CultureInfo.GetCultureInfo(languageLCID).NativeName;

			if (!_languageMappings.ContainsKey(languageName))
				_languageMappings.Add(languageName, languageLCID);

			return 1;
		}

        /// <summary>
        /// retrieves the languages available for selection.
        /// </summary>
        private void GetLanguages()
        {
            //get the languages available from registry
            //if MUI key exists 

            RegistryKey mui = Registry.LocalMachine.OpenSubKey("MUI");

			if (null != mui)
			{
				// if "Available" Key exists
				RegistryKey availableLanguagesKey = mui.OpenSubKey("Available");

				if (null != availableLanguagesKey)
				{
					_isMUI = true;
					PopulateMappings(availableLanguagesKey);
				}
				else
				{
					// if no MUI, check to see if you can use the locale
					Native.LOCALE_ENUMPROC local = new Native.LOCALE_ENUMPROC(LocaleCallback);

					PopulateMappings(local);					
				}
			}			
        }

        /// <summary>
        /// sets up the mapping of language name against the language LCID
        /// </summary>
        /// <param name="availableLanguagesKey"></param>
        private void PopulateMappings(RegistryKey availableLanguagesKey)
        {
            //get the entry name
            string[] entries = availableLanguagesKey.GetValueNames();

            //loop through and create a lookup for the entries 
            foreach (string languageHex in entries)
            {
                int languageLCID = int.Parse(languageHex, NumberStyles.AllowHexSpecifier);

                string languageName = CultureInfo.GetCultureInfo(languageLCID).NativeName;

                _languageMappings.Add(languageName, languageLCID);
            }
        }

		/// <summary>
		/// sets up the mapping of language name against the locale LCID
		/// </summary>
		/// <param name="local"></param>
		private void PopulateMappings(Native.LOCALE_ENUMPROC local)
		{
			//get the entry name, loop through and create a lookup for the entries 
			Native.EnumSystemLocales(local, Native.LocaleFlags.Supported);										
		}

        /// <summary>
        /// loads the available languages into the combo box
        /// </summary>
        private void DisplayLanguages()
        {
            LanguageComboBox.Items.Clear();

            //load up the languages into the combo box
            foreach (string languageName in _languageMappings.Keys)
                LanguageComboBox.Items.Add(languageName);

            DefaultToCurrentLanguage();         
        }

        /// <summary>
        /// display the current language 
        /// </summary>
        private void DefaultToCurrentLanguage()
        {
            //get and store the system default language
			if (_isMUI)
				_currentLanguageLCID = (int)Native.GetUserDefaultUILanguage();
			else _currentLanguageLCID = (int)Native.GetUserDefaultLCID();

            //set the combo box to show the current language
            if (_currentLanguageLCID != 0)
            {

                LanguageComboBox.SelectedItem = CultureInfo.GetCultureInfo(_currentLanguageLCID).NativeName;
            }
        }

        /// <summary>
        /// reset the device
        /// </summary>
        /// <param name="languageId"></param>
        private static void ResetDevice(int languageId)
        {

            try
            {
                bool updateSuccess;
				if (_isMUI)
					updateSuccess = Native.SetUserDefaultUILanguage(
                                        Convert.ToInt16(languageId));
				else updateSuccess = Native.SetUserDefaultLCID(
										Convert.ToInt16(languageId));

                //set the language and check the return 
                if (updateSuccess)
                {
                    //reset the device
                    Native.ResetDevice();
                }
                else
                {
                    MessageBox.Show(Resources.LanguageUpdateError, Resources.SystemError);

                }
            }
            catch (Exception ex)
            {
                Business.Services.LogErrors(ex);
                MessageBox.Show(Resources.LanguageUpdateError, Resources.SystemError);

            }
        }

        #endregion

    }
}