GPS的协议为NMEA0183

				#include "nmea0183.h"
				#pragma hdrstop
				
				/*
				** Author: Samuel R. Blackburn
				** CI$: 76300,326
				** Internet: sammy@sed.csc.com
				**
				** You can use it any way you like.
				*/
				
				IMPLEMENT_DYNAMIC( P, RESPONSE )
				
				P::P()
				{
				   Mnemonic = "P";
				   Empty();
				}
				
				P::~P()
				{
				   Mnemonic.Empty();
				   Empty();
				}
				
				void P::Empty( void )
				{
				   ASSERT_VALID( this );
				
				   Sentence.Empty();
				}
				
				BOOL P::Parse( const SENTENCE& sentence )
				{
				   ASSERT_VALID( this );
				
				   /*
				   ** This is where parsing of proprietary sentences will go...
				   */
				
				   Sentence = sentence;
				
				   return( TRUE );
				}
				
				BOOL P::Write( SENTENCE& sentence )
				{
				   ASSERT_VALID( this );
				
				   /*
				   ** Let the parent do its thing
				   */
				   
				   RESPONSE::Write( sentence );
				
				   sentence += Sentence;
				
				   sentence.Finish();
				
				   return( TRUE );
				}
				
				const P& P::operator = ( const P& source )
				{
				   ASSERT_VALID( this );
				
				   Sentence = source.Sentence;
				
				   return( *this );
				}