zda.cpp

来自「提取各种NEMA0183格式数据的类编程。」· C++ 代码 · 共 165 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: zda.cpp $
** $Revision: 4 $
** $Modtime: 10/10/98 2:40p $
*/

#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

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

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

void ZDA::Empty( void )
{
   UTCTime.Empty();
   Day                   = 0;
   Month                 = 0;
   Year                  = 0;
   LocalHourDeviation    = 0;
   LocalMinutesDeviation = 0;
}

BOOL ZDA::Parse( const SENTENCE& sentence )
{
   /*
   ** ZDA - Time & Date
   ** UTC, day, month, year and local time zone
   **
   ** $--ZDA,hhmmss.ss,xx,xx,xxxx,xx,xx*hh<CR><LF>
   **        |         |  |  |    |  |
   **        |         |  |  |    |  +- Local zone minutes description, same sign as local hours
   **        |         |  |  |    +- Local zone description, 00 to +- 13 hours
   **        |         |  |  +- Year
   **        |         |  +- Month, 01 to 12
   **        |         +- Day, 01 to 31
   **        +- Universal Time Coordinated (UTC)
   */

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

   const NMEA0183_BOOLEAN checksum_is_bad = sentence.IsChecksumBad();

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

   UTCTime = sentence.Field( 1 );

   TCHAR temp_number[ 3 ];

   temp_number[ 2 ] = 0x00;

   temp_number[ 0 ] = UTCTime[ 0 ];
   temp_number[ 1 ] = UTCTime[ 1 ];

   int hours = ::_ttoi( temp_number );

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

   int minutes = ::_ttoi( temp_number );

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

   int seconds = ::_ttoi( temp_number );

   Day                   = sentence.Integer( 2 );
   Month                 = sentence.Integer( 3 );
   Year                  = sentence.Integer( 4 );
   LocalHourDeviation    = sentence.Integer( 5 );
   LocalMinutesDeviation = sentence.Integer( 6 );

   Time = CTime( Year, Month, Day, hours, minutes, seconds );

   return( TRUE );
}

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

   sentence += UTCTime;
   sentence += Day;
   sentence += Month;
   sentence += Year;
   sentence += LocalHourDeviation;
   sentence += LocalMinutesDeviation;

   sentence.Finish();

   return( TRUE );
}

const ZDA& ZDA::operator = ( const ZDA& source )
{
   UTCTime               = source.UTCTime;
   Time                  = source.Time;
   Day                   = source.Day;
   Month                 = source.Month;
   Year                  = source.Year;
   LocalHourDeviation    = source.LocalHourDeviation;
   LocalMinutesDeviation = source.LocalMinutesDeviation;

   return( *this );
}