Apple Newton Utilities User's Guide download pdf (Page 78)

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CHAPTER 2

Getting Started

2-6 Package Loading, Activation, and Deactivation

IMPORTANT

Any changes that you make to the system in the

InstallScript function must be reversed in the

RemoveScript function. For example, if you register your

application for certain system services or install print formats,

stationery, or other objects in the system, you must reverse

these changes and remove or unregister these objects in the

RemoveScript function. If you fail to do this, such changes

cannot be removed by the user, and if your application is on a

card, they won’t be able to remove the card without getting a

warning message to put the card back.

▲

Only applications and auto parts use the InstallScript function. Note that the

InstallScript function takes one extra argument when used for an auto part.

Applications built using the NewtApp framework require special

InstallScript and RemoveScript functions. For details, see Chapter 4,

“NewtApp Applications.”

Deactivation 2

The RemoveScript function in a package part is executed when an application or

auto part is deactivated.

This function lets you perform any special deinstallation operations that you need

to do, any clean-up, and any unregistration for system services that you registered

for in the

InstallScript function.

Note that automatically removed auto parts do not use the

RemoveScript

function since such auto parts are removed immediately after the

InstallScript is executed—the RemoveScript is not executed.

In addition to the RemoveScript function, another function, DeletionScript,

is executed when the user removes a package by deleting it from the Extras

Drawer. This function applies to all types of frame parts, and is actually executed

before the

RemoveScript function.

The

DeletionScript function is optional. It lets you do different clean-up

based on the assumption that the user is permanently deleting a package, rather

than simply ejecting the card on which it happens to reside. For example, in the

DeletionScript function, you might want to delete all the soups created by the

application—checking with the user, of course, before performing such an

irreversible operation.

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