lorantd.cpp

提取各种NEMA0183格式数据的类编程。

/*
** Author: Samuel R. Blackburn
** Internet: [e-mail]
**
** Copyright, 1996-2005, Samuel R. Blackburn
**
** "You can get credit for something or get it done, but not both."
** Dr. Richard Garwin
**
** BSD License follows.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** Redistributions of source code must retain the above copyright notice,
** this list of conditions and the following disclaimer. Redistributions
** in binary form must reproduce the above copyright notice, this list
** of conditions and the following disclaimer in the documentation and/or
** other materials provided with the distribution. Neither the name of
** the WFC nor the names of its contributors may be used to endorse or
** promote products derived from this software without specific prior
** written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**
** $Workfile: lorantd.cpp $
** $Revision: 5 $
** $Modtime: 5/13/01 2:35p $
*/

#include "nmea0183.h"
#pragma hdrstop

#if defined( _DEBUG ) && defined( _INC_CRTDBG )
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#define new DEBUG_NEW
#endif // _DEBUG

LORAN_TIME_DIFFERENCE::LORAN_TIME_DIFFERENCE()
{
   Empty();
}

LORAN_TIME_DIFFERENCE::~LORAN_TIME_DIFFERENCE()
{
   Empty();
}

void LORAN_TIME_DIFFERENCE::Empty( void )
{
   Microseconds = 0.0;
   SignalStatus = LoranUnknown;
}

void LORAN_TIME_DIFFERENCE::Parse( int first_field_number, const SENTENCE& sentence )
{
   Microseconds = sentence.Double( first_field_number );

   CString field_data = sentence.Field( first_field_number + 1 );

   if ( field_data == TEXT( "B" ) )
   {
      SignalStatus = LoranBlinkWarning;   
   }
   else if ( field_data == TEXT( "C" ) )
   {
      SignalStatus = LoranCycleWarning;
   }
   else if ( field_data == TEXT( "S" ) )
   {
      SignalStatus = LoranSignalToNoiseRatioWarning;
   }
   else if ( field_data == TEXT( "A" ) )
   {
      SignalStatus = LoranValid;
   }
   else
   {
      SignalStatus = LoranUnknown;
   }
}

void LORAN_TIME_DIFFERENCE::Write( SENTENCE& sentence )
{
   sentence += Microseconds;

   switch( SignalStatus )
   {
      case LoranValid:
      
         sentence += TEXT( "A" );
         break; 

      case LoranBlinkWarning:
      
         sentence += TEXT( "B" );
         break; 

      case LoranCycleWarning:
      
         sentence += TEXT( "C" );
         break; 

      case LoranSignalToNoiseRatioWarning:
      
         sentence += TEXT( "S" );
         break; 

      default:

         sentence += TEXT( "" );
   }
}

const LORAN_TIME_DIFFERENCE& LORAN_TIME_DIFFERENCE::operator = ( const LORAN_TIME_DIFFERENCE& source )
{
   Microseconds = source.Microseconds;
   SignalStatus = source.SignalStatus;

   return( *this );
}