zfi.cpp

来自「提取各种NEMA0183格式数据的类编程。」· C++ 代码 · 共 182 行

/*
** 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: zfi.cpp $
** $Revision: 4 $
** $Modtime: 10/10/98 2:43p $
*/

/*
** This Sentence Not Recommended For New Designs
** ZFO is recommended.
*/

#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

ZFI::ZFI()
{
   Mnemonic = TEXT( "ZFI" );
   Empty();
}

ZFI::~ZFI()
{
   Mnemonic.Empty();
   Empty();
}

void ZFI::Empty( void )
{
   UTCTimeString.Empty();
   ElapsedTimeString.Empty();
   From.Empty();
}

BOOL ZFI::Parse( const SENTENCE& sentence )
{
   /*
   ** ZFI - Elapsed time from point of interest
   **
   **        1         2         3    4
   **        |         |         |    |  
   ** $--ZFI,hhmmss.ss,hhmmss.ss,c--c*hh<CR><LF>
   **
   ** 1) Universal Time Coordinated (UTC)
   ** 2) Elapsed Time
   ** 3) Waypoint ID (From)
   ** 4) Checksum
   */

   /*
   ** First we check the checksum...
   */

   const NMEA0183_BOOLEAN checksum_is_bad = sentence.IsChecksumBad();

   if ( checksum_is_bad == True )
   {
      InvalidChecksum();
      return( FALSE );
   }

   CTime temp_time = CTime::GetCurrentTime();

   int year  = temp_time.GetYear();
   int month = temp_time.GetMonth();
   int day   = temp_time.GetDay();

   UTCTimeString = sentence.Field( 1 );

   TCHAR temp_number[ 3 ];

   temp_number[ 2 ] = 0x00;

   temp_number[ 0 ] = UTCTimeString[ 0 ];
   temp_number[ 1 ] = UTCTimeString[ 1 ];

   int hours = ::_ttoi( temp_number );

   temp_number[ 0 ] = UTCTimeString[ 2 ];
   temp_number[ 1 ] = UTCTimeString[ 3 ];

   int minutes = ::_ttoi( temp_number );

   temp_number[ 0 ] = UTCTimeString[ 4 ];
   temp_number[ 1 ] = UTCTimeString[ 5 ];

   int seconds = ::_ttoi( temp_number );

   UTCTime = CTime( year, month, day, hours, minutes, seconds );

   ElapsedTimeString = sentence.Field( 2 );

   temp_number[ 0 ] = ElapsedTimeString[ 0 ];
   temp_number[ 1 ] = ElapsedTimeString[ 1 ];

   hours = ::_ttoi( temp_number );

   temp_number[ 0 ] = ElapsedTimeString[ 2 ];
   temp_number[ 1 ] = ElapsedTimeString[ 3 ];

   minutes = ::_ttoi( temp_number );

   temp_number[ 0 ] = ElapsedTimeString[ 4 ];
   temp_number[ 1 ] = ElapsedTimeString[ 5 ];

   seconds = ::_ttoi( temp_number );

   ElapsedTime = CTime( year, month, day, hours, minutes, seconds );

   From = sentence.Field( 3 );

   return( TRUE );
}

BOOL ZFI::Write( SENTENCE& sentence )
{
   /*
   ** Let the parent do its thing
   */
   
   RESPONSE::Write( sentence );

   sentence += UTCTimeString;
   sentence += ElapsedTimeString;
   sentence += From;

   sentence.Finish();

   return( TRUE );
}

const ZFI& ZFI::operator = ( const ZFI& source )
{
   UTCTimeString     = source.UTCTimeString;
   UTCTime           = source.UTCTime;
   ElapsedTimeString = source.ElapsedTimeString;
   ElapsedTime       = source.ElapsedTime;
   From              = source.From;

   return( *this );
}