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101

CHAPTER 22

Transport Interface

Using the Transport Interface 22-15

e-mail address to the sender’s internet address. Here’s an example of code that sets

the appropriate e-mail address in the

fromRef object:

owner:=ResolveEntryAlias(GetUserConfig('currentPersona));

if owner and GetRoot().cardfile then begin

addrs := GetRoot().cardfile:BcEmailAddress(owner,

['|string.email.internet|]);

if addrs then

fromRef := clone(addrs[0]);

end

You can ﬁnd a description of BcEmailAddress and other similar functions that

extract information from Names soup entries in “Names Functions and Methods”

(page 16-5) in Newton Programmer’s Reference.

If, instead of extracting the address and sending it as a string, your transport sends

addressing information as a frame, like the beam transport, you must remove any

soup entry aliases from the name reference before it is transmitted. You can do

this by using the name reference data deﬁnition method

PrepareForRouting,

as follows:

// strip the aliases from a name ref

fromRef := datadef:PrepareForRouting(fromRef);

In general, however, you should not send all the information in a user’s persona

with a message, since it can include personal or conﬁdential information such as

credit card numbers.

For more information about name references and the methods of name reference

data deﬁnitions, see the section “Creating a Name Reference” beginning on

page 21-27, and “Name References” (page 5-1) in Newton Programmer’s

Reference.

The following is an example of how to override the

NewItem method during a

send operation to add a

fromRef slot:

// a sample overridden NewItem method

mytransport.NewItem := func(context) begin

// first call inherited method to get default frame

local item := inherited:NewItem(context);

// get sender info and insert fromRef slot

local persona:= GetUserConfig('currentPersona);

local dataDef := GetDataDefs(addressingClass);

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