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using System;using System.Threading;using System.Runtime.InteropServices;

namespace CellId{ public class RIL { // string used to store the CellID string private static string celltowerinfo = "";

/* * Uses RIL to get CellID from the phone. */

public static string GetCellTowerInfo() { // initialise handles IntPtr hRil = IntPtr.Zero; IntPtr hRes = IntPtr.Zero;

// initialise result celltowerinfo = "";

// initialise RIL

hRes = RIL_Initialize(1, // RIL port 1 new RILRESULTCALLBACK(rilResultCallback), // function to call with result null, // function to call with notify 0, // classes of notification to enable 0, // RIL parameters out hRil); // RIL handle returned

if (hRes != IntPtr.Zero) { return "Failed to initialize RIL"; }

// initialised successfully

// use RIL to get cell tower info with the RIL handle just created hRes = RIL_GetCellTowerInfo(hRil);

// wait for cell tower info to be returned waithandle.WaitOne();

// finished - release the RIL handle RIL_Deinitialize(hRil);

// return the result from GetCellTowerInfo return celltowerinfo; }

// event used to notify user function that a response has // been received from RIL

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private static AutoResetEvent waithandle = new AutoResetEvent(false);

public static void rilResultCallback(uint dwCode,

IntPtr hrCmdID,IntPtr lpData,uint cbData,uint dwParam)

{ // create empty structure to store cell tower info in RILCELLTOWERINFO rilCellTowerInfo = new RILCELLTOWERINFO();

// copy result returned from RIL into structure Marshal.PtrToStructure(lpData, rilCellTowerInfo);

// get the bits out of the RIL cell tower response that we want celltowerinfo = rilCellTowerInfo.dwCellID + "-" + rilCellTowerInfo.dwLocationAreaCode + "-" + rilCellTowerInfo.dwMobileCountryCode;

// notify caller function that we have a result waithandle.Set(); }

// ------------------------------------------------------------------- // RIL function definitions // -------------------------------------------------------------------

/** Function definition converted from the definition* RILRESULTCALLBACK from MSDN:

** http://msdn2.microsoft.com/en-us/library/aa920069.aspx

*/ public delegate void RILRESULTCALLBACK(uint dwCode,

IntPtr hrCmdID, IntPtr lpData, uint cbData, uint dwParam);

/* * Function definition converted from the definition

* RILNOTIFYCALLBACK from MSDN: *

* http://msdn2.microsoft.com/en-us/library/aa922465.aspx */ public delegate void RILNOTIFYCALLBACK(uint dwCode,

IntPtr lpData, uint cbData, uint dwParam);

/* * Class definition converted from the struct definition

* RILCELLTOWERINFO from MSDN: *

* http://msdn2.microsoft.com/en-us/library/aa921533.aspx */

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public class RILCELLTOWERINFO { public uint cbSize; public uint dwParams; public uint dwMobileCountryCode; public uint dwMobileNetworkCode; public uint dwLocationAreaCode; public uint dwCellID; public uint dwBaseStationID; public uint dwBroadcastControlChannel; public uint dwRxLevel; public uint dwRxLevelFull; public uint dwRxLevelSub; public uint dwRxQuality; public uint dwRxQualityFull; public uint dwRxQualitySub; public uint dwIdleTimeSlot; public uint dwTimingAdvance; public uint dwGPRSCellID; public uint dwGPRSBaseStationID; public uint dwNumBCCH; }

// -------------------------------------------------------------------

// RIL DLL functions// -------------------------------------------------------------------

/* Definition from: http://msdn2.microsoft.com/en-us/library/aa919106.aspx */ [DllImport("ril.dll")] private static extern IntPtr RIL_Initialize(uint dwIndex,

RILRESULTCALLBACK pfnResult,

RILNOTIFYCALLBACK pfnNotify,

uint dwNotificationClasses,uint dwParam,

out IntPtr lphRil);

/* Definition from: http://msdn2.microsoft.com/en-us/library/aa923065.aspx */ [DllImport("ril.dll")] private static extern IntPtr RIL_GetCellTowerInfo(IntPtr hRil);

/* Definition from: http://msdn2.microsoft.com/en-us/library/aa919624.aspx */ [DllImport("ril.dll")] private static extern IntPtr RIL_Deinitialize(IntPtr hRil); }}