Apple Newton Utilities Uživatelská příručka stáhnout pdf (Strana 779)

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CHAPTER 21

Routing Interface

Using Routing 21-31

Receiving Data 21

Incoming data arrives ﬁrst as an entry in the In Box. If there is a public view

deﬁnition registered for the class of the entry, the item may then be viewed directly

in the In Box.

IMPORTANT

Generally, the body slot of every received item must have a

meaningful class. (This is not strictly required if the item has an

appSymbol slot.) If body contains a frame, its class slot

identiﬁes its data class. Items received from other Newton devices

generally have a

body.class slot. For items received from

other systems, the transport must assign a meaningful class

(use

SetClass). ▲

An incoming item may be stored in the In Box until the user chooses to manually

put away the item into an application, or an incoming item may be transferred

automatically to an application as soon as the item arrives in the In Box. This is

controlled by the applications present on the Newton and described in detail in the

following sections.

If an In Box item contains an

appSymbol slot, that slot identiﬁes the receiving

application for the item. The system uses this slot to identify the default application

to which the item should be put away (if any). If the original item contained a

destAppSymbol slot when submitted to the In Box, that slot is copied into the

appSymbol slot to identify the application that should receive it. The receiving

transport does this before the item is passed to the In Box by using the transport

method

NewFromItem.

These are the minimum steps you need to take to support receiving items through

the In/Out Box in your application:

■ Supply a PutAwayScript method in your application base view. When a user

chooses to put away an item to your application from the In/Out Box, the item is

passed to this method.

■ Register the data classes that your application can accept by using the

RegAppClasses function in the application part InstallScript function.

Unregister using

UnRegTheseAppClasses or UnRegAppClasses in the

application part

RemoveScript function.

Automatically Putting Away Items 21

The ﬁrst thing the In Box does with an incoming item is to determine which

applications might want to accept the item immediately. The In Box does this by

checking the In Box application registry to ﬁnd out if any applications have

registered to accept such items; see the section “Registering to Receive Foreign

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