Apple Newton Utilities Guía de usuario descargar pdf (Pagina 791)

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CHAPTER 22

Transport Interface

About Transports 22-3

destAppSymbol Optional. A symbol identifying the application to receive the

item, if it is different from the sending application.

Applications that send data should set this slot to identify the

receiving application, if it is different from the sending one.

On the receiving side, the transport method

NewFromItem

copies this value into the

appSymbol slot of the received

item frame.

body The frame being sent (or references to the data). This is

supplied by the application. This can be a multiple-item

target object that references more than one data object to

send. All application-speciﬁc data should be stored within the

body slot.

title Optional. This string is used in the In/Out Box as the item’s

title. The transport may provide this for received items that

do not contain a data deﬁnition. If this slot is not provided,

the transport obtains a title from the item’s data deﬁnition.

remote A value interpreted as a Boolean. Any non-nil value

indicates an item whose body is stored remotely. The

transport must set this slot if it downloads just the title of an

item but leaves the body stored remotely. When the user tries

to view the item, the In Box alerts the transport to download

the body of the item from the remote host by sending it the

ReceiveRequest message.

connect A Boolean used for items to be sent. This slot is set to true

if the user chooses to send the item immediately with the

Send button in the routing slip. If the user chooses to send the

item later, this slot is set to

nil. Note that this slot can also

be set by the format method

SetupItem or the Send function.

error An integer error code; non-nil indicates an error. This is

usually set by

ItemCompleted.

currentFormat A symbol identifying the selected format for this item.

hidden A Boolean; if true, the item is not displayed in the In/Out

Box. If set to true, the

completionScript slot must also

be set to

true and the application must have an

ItemCompletionScript method.

covert A Boolean; if true, the item is not logged or saved.

state A symbol indicating status: 'ready, 'sent, 'received,

'read, 'inLog, 'outLog, or 'pending. This is usually

set by

ItemCompleted. Do not set this

slot directly.

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