Copyright ©1997 by AAA+ Software Forschungs- und Entwicklungs Ges.m.b.H. All Rights Reserved. Revision 1.02 - October 28, 1997.
Extending Joy by Objective-C classes
This mini-example shows how to extend the functionality of the Joy interpreter with compiled Objective-C classes.
Start the Joy interpreter (e.g. inside InterfaceBuilder if you have the Joy palette installed - see the Joy tutorial for details) and change to this directory by typing at the prompt: |
joy> cd $env(NEXT_ROOT)/LocalLibrary/Joy/Examples/ObjC-Extensions
The file Thermometer.m contains the Objective-C source of a simple class converting temperatures from Celsius to Fahrenheit. Compile this file to a shared library using the command: |
joy> exec gcc -ObjC -bundle -o Thermometer.dll Thermometer.m -framework Foundation
To load the package into the Joy interpreter type: |
joy> load Thermometer.dll
You can then use the Thermometer class within Joy like any other class, e.g: |
joy> set t [Thermometer defaultThermometer]
Thermometer@0x20ac78
joy> $t setTemperature: 12.5
joy> $t temperatureInFahrenheit
54.5