/*
**?Author:?Samuel?R.?Blackburn
**?Internet:?wfc@pobox.com
**
**?Copyright?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.
**
**?$Workfile:?HVD.cpp?$
**?$Revision:?4?$
**?$Modtime:?10/10/98?2:44p?$
*/

#include?“nmea0183.h“
/*
**?This?Sentence?Not?Recommended?For?New?Designs
**?HDG?is?recommended.
*/

#pragma?hdrstop

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

HVD::HVD（）
{
???Mnemonic?=?TEXT（?“HVD“?）;
???Empty（）;
}

HVD::~HVD（）
{
???Mnemonic.Empty（）;
???Empty（）;
}

void?HVD::Empty（?void?）
{
???MagneticVariationDegrees???=?0.0;
???MagneticVariationDirection?=?EW_Unknown;
}

BOOL?HVD::Parse（?const?SENTENCE&?sentence?）
{
???/*
???**?HVD?-?Magnetic?Variation?Automatically?set
???**
???**????????1???2?3
???**????????|???|?|
???**?$--HVDx.xa*hh
???**
???**?Field?Number:?
???**??1）?Magnetic?Variation?degrees
???**??2）?Magnetic?Variation?direction?E?=?Easterly?W?=?Westerly
???**??3）?Checksum
???*/

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

???const?NMEA0183_BOOLEAN?checksum_is_bad?=?sentence.IsChecksumBad（）;

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

???MagneticVariationDegrees???=?sentence.Double（?1?）;
???MagneticVariationDirection?=?senten

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

????.......??????3908??2005-02-25?11:07??NMEA0183\AAM.CPP

????.......??????2494??2005-02-22?15:46??NMEA0183\AAM.HPP

????.......??????6814??2005-02-25?11:07??NMEA0183\ALM.CPP

????.......??????2775??2005-02-24?11:30??NMEA0183\ALM.HPP

????.......??????9565??2005-02-28?14:38??NMEA0183\APB.CPP

????.......??????3255??2005-02-28?14:38??NMEA0183\APB.HPP

????.......??????2661??2005-02-22?20:25??NMEA0183\ASD.CPP

????.......??????2148??2005-02-24?11:30??NMEA0183\ASD.HPP

????.......??????4157??2005-02-25?11:08??NMEA0183\BEC.CPP

????.......??????2517??2005-02-24?11:30??NMEA0183\BEC.HPP

????.......??????3963??2005-02-28?14:39??NMEA0183\BOD.CPP

????.......??????2476??2005-02-28?14:38??NMEA0183\BOD.HPP

????.......??????4680??2005-02-26?22:21??NMEA0183\BWC.CPP

????.......??????2614??2005-02-26?22:11??NMEA0183\BWC.HPP

????.......??????4693??2005-02-26?22:22??NMEA0183\BWR.CPP

????.......??????2622??2005-02-26?22:12??NMEA0183\BWR.HPP

????.......??????3711??2005-02-25?11:09??NMEA0183\BWW.CPP

????.......??????2431??2005-02-24?11:30??NMEA0183\BWW.HPP

????.......???????416??1994-12-31?07:55??NMEA0183\CHECKSUM.CPP

????.......??????3572??2005-02-25?11:09??NMEA0183\DBT.CPP

????.......??????2403??2005-02-24?11:30??NMEA0183\DBT.HPP

????.......??????6118??2005-02-25?11:09??NMEA0183\DCN.CPP

????.......??????2855??2005-02-24?11:30??NMEA0183\DCN.HPP

????.......??????2928??2005-02-22?20:27??NMEA0183\DECCALOP.CPP

????.......??????2549??2005-02-24?11:30??NMEA0183\DECCALOP.HPP

????.......??????3492??2005-02-25?11:09??NMEA0183\DPT.CPP

????.......??????2400??2005-02-24?11:30??NMEA0183\DPT.HPP

????.......?????11001??2005-02-22?20:27??NMEA0183\EXPID.CPP

????.......??????1129??1995-01-02?10:04??NMEA0183\FIELD.CPP

????.......??????2774??2005-02-22?20:27??NMEA0183\FREQMODE.CPP

............此處省略195個文件信息