Apple Newton Utilities Podręcznik Użytkownika Pobierz pdf (Strona 703)

100

101

CHAPTER 19

Built-in Applications and System Data

Time Zones 19-29

though that the list of cities and countries is not necessarily the same on your

Newton device and the user of your application. Your application should also check

string names for cities and countries entered by the user.

The

GetCountryEntry function performs an additional search based on the

class of the string passed in. This is done in order to take into account the language

of the ROM used; the symbols are all in English. To set the class of a string, use the

SetCountryClass function, described in Chapter 20, “Localizing Newton

Applications.”

The frame returned by the

GetCityEntry function is the same as the

newCityFrame parameter to the

NewCity function described in “Adding a City to

a Newton Device” beginning on page 19-29. For information on the frame returned

by the

GetCountryEntry function see the description of this function in Newton

Programmer’s Reference.

Adding a City to a Newton Device 19

The Time Zones NewCity method adds a city to a Newton device. It takes a

newCityFrame parameter which is a frame with the following slots:

Slot descriptions

name Required. A string containing the name of the location.

longitude Required. The longitude of the location. The formula for

generating this value appears in “Using Longitude and

Latitude Values” beginning on page 19-30.

latitude Required. The latitude of the location.

gmt Required. The offset in minutes from Greenwich Mean Time.

country Required. A symbol representing the country in which the

city is located.

areaCode Optional. A string for the area code of the location.

region Optional. A string for the region of the location. For cities

in the U.S. this should be the state; for cities in Canada

the province.

airport Optional. A string for the airport designation for the city, or

an array of strings if the city is served by multiple airports.

Here is an example of such a frame:

{name:"Portland",

longitude:354036540,

latitude:67929083,

gmt: -28800,

country:'USA,

1 2 ... 698 699 700 701 702 703 704 705 706 707 708 ... 941 942

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