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using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Runtime.InteropServices;

 

namespace CheckIfDeviceConnected

{

   public partial class Form1 : Form

   {

      public Form1()

      {

         InitializeComponent();

         

      }

 

      [DllImport("rapi.dll")]

      public static extern void CeRapiInitEx(ref RAPIINIT pRapiInit);

 

      [DllImport("rapi.dll", CharSet = CharSet.Unicode)]

      public static extern Int32 CeRapiUninit();

 

      [StructLayout(LayoutKind.Sequential)]

      public struct RAPIINIT

      {

         public int cbsize;

         public IntPtr heRapiInit;

         public UInt32 hrRapiInit;

      };

 

      private void btnCheck_Click(object sender, EventArgs e)

      {

         try

         {

            RAPIINIT r = new RAPIINIT();

            r.cbsize = Marshal.SizeOf(r);

            CeRapiInitEx(ref r);

            if (r.hrRapiInit==0)

            {

               MessageBox.Show("Device is connected");

            }

            else

            {

               MessageBox.Show("Device is not connected");

            }

         }

         finally

         {

            CeRapiUninit();

         }

      }

   

 

   }

}