Apple Newton Programmer’s Newton 2.0 (for Newton 2.0) Instrukcja Użytkownika Pobierz pdf (Strona 793)

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CHAPTER 22

Transport Interface

Using the Transport Interface 22-5

Using the Transport Interface 22

This section describes how to use the Transport interface to perform these

speciﬁc tasks:

■ create a new transport object

■ create a routing information template, for use by the In/Out Box

■ control the built-in status template, if you need to provide status information to

the user

■ create a routing slip template, if your transport sends data

■ create a transport preferences template, if your transport has user-

conﬁgurable options

Providing a Transport Object 22

To make a new transport object, create a frame with a prototype of

protoTransport.

Transports are not built as applications, but are built as auto parts. This means that

when installed, they add their services to the system but do not add an application

to the Extras Drawer. (They are represented by an icon in the Extras Drawer, but

you can’t tap it to open it like you can an application icon.)

For a complete description of the

protoTransport object, see “protoTransport”

(page 19-2) in Newton Programmer’s Reference.

The following subsections describe operations that a transport can perform, and

the methods that you must supply or call in your transport object to support

these operations.

Installing the Transport 22

To install a new transport in the system, call the RegTransport function from the

InstallScript function of your transport part and pass it the transport

appSymbol and transport template. The RegTransport function additionally

sends your transport object the

InstallScript message; this message is

unrelated to the

InstallScript function used by package parts. The

InstallScript message sent to your transport object lets the transport perform

initialization operations when it is installed.

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