#include <regext.h>
#include <snapi.h>

// Register the window notification
HRESULT RegisterWindows()
{
  HRESULT hr;
  NOTIFICATIONCONDITION nc;

  // Register the phone call calling notification.
  // By setting dwMask = SN_PHONECALLCALLING_BITMASK, we will get a
notification only when there is a 
  // change in the bit indicating whether the phone is currently
attempting to connect an outgoing call.

  nc.ctComparisonType = REG_CT_ANYCHANGE;
  nc.dwMask		 = SN_PHONECALLCALLING_BITMASK;
  nc.TargetValue.dw   = 0;

  hr = RegistryNotifyCallback(
				SN_PHONECALLCALLING_ROOT,  // registry root to
monitor
				SN_PHONECALLCALLING_PATH,  // registry path to
monitor
				SN_PHONECALLCALLING_VALUE, // registry value to
monitor
				PhoneCallCallingCallback,  // callback to be
called when bit changes
				0,  
				&nc,
				&g_NotifyPhoneCallCalling
				);

  return hr;
}


// Callback function that is called when the bit indicating a call
is being made changes
void PhoneCallCallingCallback(HREGNOTIFY hNotify, DWORD dwUserData,
const PBYTE pData, const UINT cbData)
{
  DWORD PhoneCallCallingStatus;
  PDWORD pdwData;
  TCHAR PhoneCallCallingStr[STATUS_STRING_LEN];

  StringCchCopy(PhoneCallCallingStr, STATUS_STRING_LEN, L"");

  // get the changed value
  pdwData = (DWORD *)pData;
  PhoneCallCallingStatus = *pdwData;

  // only look at the value of the bit we are interested in
  if (PhoneCallCallingStatus & SN_PHONECALLCALLING_BITMASK)
  {
	StringCchCopy(PhoneCallCallingStr, STATUS_STRING_LEN,
L"Attempting to connect an outgoing call");
  }
  else 
  {
	StringCchCopy(PhoneCallCallingStr, STATUS_STRING_LEN, L"Not
connecting");
  }

  // TODO: use PhoneCallCallingStr as needed

}