录信息已是个不错的方法，下一章我们将修改程序，用表控件来做到这一点。

程序列表
// CH.2 The super-include for the Palm OS
#include <Pilot.h>

// CH.5 Added for the call to GrfSetState()
#include <Graffiti.h>

// CH.3 Our resource file
#include "Contacts_res.h"

// CH.4 Prototypes for our event handler functions
static Boolean contactDetailHandleEvent( EventPtr event );
static Boolean aboutHandleEvent( EventPtr event );
static Boolean enterTimeHandleEvent( EventPtr event );
static Boolean contactListHandleEvent( EventPtr event );
static Boolean menuEventHandler( EventPtr event );

// CH.4 Constants for ROM revision
#define ROM_VERSION_2 0x02003000
#define ROM_VERSION_MIN ROM_VERSION_2

// CH.5 Prototypes for utility functions
static void newRecord( void );
static VoidPtr getObject( FormPtr, Word );
static void setFields( void );
static void getFields( void );
static void setText( FieldPtr, CharPtr );
static void getText( FieldPtr, VoidPtr, Word );
static void setDateTrigger( void );
static void setTimeTrigger( void );
static void setTimeControls( void );
static void buildList( void );
static Int sortFunc( CharPtr, CharPtr, Int );

// CH.5 Our open database reference
static DmOpenRef contactsDB;
static ULong numRecords;
static UInt cursor;
static Boolean isDirty;
static VoidHand hrecord;

// CH.5 Constants that define the database record
#define DB_ID_START 0
#define DB_ID_SIZE (sizeof( ULong ))
#define DB_DATE_TIME_START (DB_ID_START +\
DB_ID_SIZE)
#define DB_DATE_TIME_SIZE (sizeof( DateTimeType ))
#define DB_FIRST_NAME_START (DB_DATE_TIME_START +\
DB_DATE_TIME_SIZE)
#define DB_FIRST_NAME_SIZE 16
#define DB_LAST_NAME_START (DB_FIRST_NAME_START +\
DB_FIRST_NAME_SIZE)
#define DB_LAST_NAME_SIZE 16
#define DB_PHONE_NUMBER_START (DB_LAST_NAME_START +\
DB_LAST_NAME_SIZE)
#define DB_PHONE_NUMBER_SIZE 16
#define DB_RECORD_SIZE (DB_PHONE_NUMBER_START +\
DB_PHONE_NUMBER_SIZE)

// CH.6 Storage for the record's date and time in expanded form
static DateTimeType dateTime;
static Word timeSelect;
#define NO_DATE 0
#define NO_TIME 0x7fff

// CH.7 The error exit macro
#define errorExit(alert) { ErrThrow( alert ); }

// CH.7 Contact list variables
static VoidHand hchoices; // CH.7 Handle to packed choices
static VoidHand hpchoices; // CH.7 Handle to pointers

// CH.7 The sort order variable and constants
static Int sortBy;
// CH.7 NOTE: These items match the popup list entries!
#define SORTBY_DATE_TIME 0
#define SORTBY_FIRST_NAME 1
#define SORTBY_LAST_NAME 2

// CH.2 The main entry point
DWord PilotMain( Word cmd, Ptr, Word )
{
DWord romVersion; // CH.4 ROM version
FormPtr form; // CH.2 A pointer to our form structure
EventType event; // CH.2 Our event structure
Word error; // CH.3 Error word

// CH.4 Get the ROM version
romVersion = 0;
FtrGet( sysFtrCreator, sysFtrNumROMVersion, &romVersion );

// CH.4 If we are below our minimum acceptable ROM revision
if( romVersion < ROM_VERSION_MIN )
{
// CH.4 Display the alert
FrmAlert( LowROMVersionErrorAlert );

// CH.4 PalmOS 1.0 will continuously re-launch this app
// unless we switch to another safe one
if( romVersion < ROM_VERSION_2 )
{
AppLaunchWithCommand( sysFileCDefaultApp,
sysAppLaunchCmdNormalLaunch, NULL );
}
return( 0 );
}

// CH.2 If this is not a normal launch, don't launch
if( cmd != sysAppLaunchCmdNormalLaunch )
return( 0 );

// CH.5 Create a new database in case there isn't one
if( ((error = DmCreateDatabase( 0, "ContactsDB-PPGU", 'PPGU', 'ctct',
false )) != dmErrAlreadyExists) && (error != 0) )
{
// CH.5 Handle db creation error
FrmAlert( DBCreationErrorAlert );
return( 0 );
}

// CH.5 Open the database
contactsDB = DmOpenDatabaseByTypeCreator( 'ctct', 'PPGU',
dmModeReadWrite );

// CH.5 Get the number of records in the database
numRecords = DmNumRecords( contactsDB );

// CH.5 Initialize the record number
cursor = 0;

// CH.7 Choose our starting page
// CH.5 If there are no records, create one
if( numRecords == 0 )
{
newRecord();
FrmGotoForm( ContactDetailForm );
}
else
FrmGotoForm( ContactListForm );

// CH.7 Begin the try block
ErrTry {

// CH.2 Our event loop
do
{
// CH.2 Get the next event
EvtGetEvent( &event, -1 );

// CH.2 Handle system events
if( SysHandleEvent( &event ) )
continue;

// CH.3 Handle menu events
if( MenuHandleEvent( NULL, &event, &error ) )
continue;

// CH.4 Handle form load events
if( event.eType == frmLoadEvent )
{
// CH.4 Initialize our form
switch( event.data.frmLoad.formID )
{
// CH.4 Contact Detail form
case ContactDetailForm:
form = FrmInitForm( ContactDetailForm );
FrmSetEventHandler( form, contactDetailHandleEvent );
break;

// CH.4 About form
case AboutForm:
form = FrmInitForm( AboutForm );
FrmSetEventHandler( form, aboutHandleEvent );
break;

// CH.6 Enter Time form
case EnterTimeForm:
form = FrmInitForm( EnterTimeForm );
FrmSetEventHandler( form, enterTimeHandleEvent );
break;


// CH.7 Contact List form
case ContactListForm:
form = FrmInitForm( ContactListForm );
FrmSetEventHandler( form, cont