Apple Newton Utilities Podręcznik Użytkownika Pobierz pdf (Strona 794)

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101

CHAPTER 22

Transport Interface

22-6 Using the Transport Interface

Here is an example of installing a transport in the part InstallScript function:

InstallScript := func(partFrame,removeFrame)

begin

RegTransport(kAppSym, partFrame.partData.(kAppSym));

// assumes that partData.(kAppSym) holds the transport

end;

When your transport is removed, use the UnRegTransport function to unregister

the transport from the system. You pass the

UnRegTransport function the

transport

appSymbol like this:

RemoveScript := func(removeFrame)

begin

UnRegTransport(kAppSym);

end;

If your transport is scrubbed by the user from the Extras Drawer, the system

also calls the

DeletionScript function in its package part. In the

DeletionScript function, you should call the DeleteTransport function,

which removes user conﬁguration information related to the transport. Here’s an

example of a

DeletionScript function:

SetPartFrameSlot('DeletionScript,func(removeFrame)

begin

// delete prefs and other temporary data

DeleteTransport(kAppSym);

end)

Setting the Address Class 22

The transport object contains a slot, addressingClass, that holds a symbol.

This symbol identiﬁes the class of the address information used by the transport,

such as that stored in the

toRef and fromRef slots of an item. (See the section

“Item Frame” beginning on page 22-2.) The In/Out Box uses this symbol to look

up and display the to and from address information based on soup entries (usually

from the Names soup).

The class of address information is deﬁned by name reference data deﬁnitions

registered in the system. You can specify one of the following built-in name

reference data deﬁnitions in the

addressingClass slot:

■ '|nameRef.email|, for use with a transport that handles e-mail

■ '|nameRef.fax|, for use with a transport that handles fax phone calls

■ '|nameRef.phone|, for use with a transport that handles other phone calls

Or you can specify a custom name reference data deﬁnition that you have created

and registered with the system. Note that all name reference data deﬁnitions must

be registered under a symbol that is a subclass of

'nameref.

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