windows mobile 信号检测

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using System.Collections;
using Microsoft.WindowsMobile.Status;


namespace simple_snapi_ul
{
    public partial class Form1 : Form
    {
        private Timer SyncTimer = null;

        public Form1()
        {
            InitializeComponent();
            SetUpNotifications();
        }
              

        private ArrayList stateList = new ArrayList();

        public void SetUpNotifications()
        {
            // This tells which states to monitor
            SystemState s;
            // Monitor for ActiveSync Connection
            s = new SystemState(SystemProperty.CradlePresent);
            s.Changed += new ChangeEventHandler(ChangeOccurred);
            stateList.Add(s);
            // Monitor for GPRS Connection
            s = new SystemState(SystemProperty.PhoneGprsCoverage);
            s.Changed += new ChangeEventHandler(ChangeOccurred);
            stateList.Add(s);
            //Monitor for Network Connection (eg. WiFi)
            s = new SystemState(SystemProperty.ConnectionsNetworkCount);
            s.Changed += new ChangeEventHandler(ChangeOccurred);
            stateList.Add(s);

           

            UpdateConnectionState();
        }

        public void ChangeOccurred(object sender, ChangeEventArgs args)
        {
            // If a change occurs
            SystemState state = (SystemState)sender;
            UpdateConnectionState();
        }

        public void UpdateConnectionState()
        {
            // Set the check boxes based on the current state of the networks
            activesync.Checked = Convert.ToBoolean(SystemState.GetValue(SystemProperty.CradlePresent));
            gprs.Checked = Convert.ToBoolean(SystemState.GetValue(SystemProperty.PhoneGprsCoverage));
            wifi.Checked = Convert.ToBoolean(SystemState.GetValue(SystemProperty.ConnectionsNetworkCount));
        }
 

        private void btnSync_Click(object sender, EventArgs e)
        {
            Sync();
        }

        private void Sync()
        {

            // Sync
            MessageBox.Show("A synchornization would now be executed");

            //////////////////////////////////////////////////////////
            //                                                      //
            //               Insert Sync Code Here                  //
            //                                                      //
            //////////////////////////////////////////////////////////

            txtStatus.Text = "Synchronization complete.";
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        public void SyncTimerEvent(object unused, EventArgs notused)
        {
            Sync();
        }

        private void chkTimer_CheckStateChanged(object sender, EventArgs e)
        {
            this.SyncTimer = new Timer();
            this.SyncTimer.Interval = 5000;
            this.SyncTimer.Enabled = false;
            this.SyncTimer.Tick += new EventHandler(SyncTimerEvent);
            if (chkTimer.Checked)
                this.SyncTimer.Enabled = true;
            else
                this.SyncTimer.Enabled = false;


        }

    }
}