Apple Newton Utilities User's Guide download pdf (Page 514)

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CHAPTER 12

Special-Purpose Objects for Data Storage and Retrieval

12-8 Using Special-Purpose Data Storage Objects

You can use the IsSameEntry function to compare entries and aliases to each

other; this function returns

true for any two aliases or references to the same

entry. For example:

// return entries that contain "bob" and "Apple"

local myCurs:= namesSoup:Query({ entireWords: true,

words:["Bob", "Apple"]});

local aBob:= myCurs:Entry();

// keep an alias to bob around

local bobAlias := MakeEntryAlias(aBob);

// the following comparison returns true

IsSameEntry(aBob, bobAlias)

The IsEntryAlias function returns true if its argument is an entry alias, as

shown in the following example:

// return entries that contain "bob" and "Apple"

local myCurs:= namesSoup:Query({ entireWords: true,

words:["Bob", "Apple"]});

// keep an alias to bob around

local bobAlias := MakeEntryAlias(myCurs:Entry());

// the following test returns true

IsEntryAlias(bobAlias);

Using Virtual Binary Objects 12

This section describes how to use a virtual binary object to store binary data that is

too large to ﬁt into the NewtonScript heap. Topics discussed include:

■ creating compressed or uncompressed VBOs

■ saving VBOs in soup entries

■ adding data to VBOs

■ undoing changes to VBO data

In addition to the subjects discussed here, see “VBO Functions and Methods”

(page 9-74) in Newton Programmer’s Reference for descriptions of VBO utility

functions.

Creating Virtual Binary Objects 12

When you create a VBO, you specify whether its associated binary data is to be

stored in compressed or uncompressed format. Whether you create compressed or

uncompressed VBO objects is a question of space versus speed: uncompressed

data provides faster access, but requires more store space than the equivalent

compressed data.

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