File: ReadMe.txt

 Abstract: ReadMe file for the CarbonCocoaTempConverter sample.

 Version: 1.1

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"CarbonCocoaTempConverter" demonstrates how to integrate Carbon and Cocoa user interfaces in the same Cocoa application. Both user interfaces allow users to convert Fahrenheit temperatures to Celsius. This sample implements routines that listens for and handle events in the Carbon window. 

Listening for Events in the Carbon Window

This sample uses the Carbon InstallWindowEventHandler macro to listen for events in the Carbon window. This macro calls the "CarbonWindowCommandHandler"  routine whenever it detects command events in the Carbon window. These events are generated whenever users click in the window. See below for an example:

InstallWindowEventHandler(window,NewEventHandlerUPP(CarbonWindowCommandHandler),1, &commSpec, (void *) window, NULL);

Handling Events in the Carbon Window

This sample defines a command ID kConvertCommand, which is associated with the "Convert" button in the Carbon window. 

The "CarbonWindowCommandHandler" routine is called as soon as InstallWindowEventHandler receives a command event. This routine checks the value of the received command event and calls "ConvertCommandHandler" if the command ID of the received event is equal to kConvertCommand. 

Converting Fahrenheit Temperatures to Celsius

This sample uses the "fahrenheitToCelsius method" to convert Fahrenheit temperatures to Celsius when users click the "Convert" button in the Cocoa window.

"CarbonCocoaTempConverter" uses the "ConvertCommandHandler" routine to perform the above operation when users click the "Convert" button in the Carbon window.

Using the Sample 

Open this sample in Mac OS X 10.4 and later using Xcode.  

Click the Build and Go toolbar item in the project window to compile and run this application.

Enter a number in the fahrenheit textfield in either Carbon or Cocoa window when they appear. Click the "Convert" button to get a Celsius value. 

Changes from Previous Versions

Updated the ReadMe file.

Removed the precompiledheader.h file.

Cleaned up code and added comments.

Added the init and dealloc methods to the MyController.m.

Renamed the convertTemp IBAction method to fahrenheitToCelsius. 

Upgraded sample so it can run on both PowerPC and Intel-based Macintoshes.

Further Reading

Introduction to Carbon-Cocoa Integration Guide 

<http://developer.apple.com/documentation/Cocoa/Conceptual/CarbonCocoaDoc/CarbonCocoaDoc.html>

Creating and Registering an Event Handler 

<http://developer.apple.com/documentation/Carbon/Conceptual/Carbon_Event_Manager/Tasks/chapter_3_section_4.html>

Command Events

<http://developer.apple.com/documentation/Carbon/Conceptual/Carbon_Event_Manager/Tasks/chapter_3_section_8.html>

Feedback and Bug Reports

Please send all feedback about this sample by using the Feedback form on the bottom of the sample's webpage. Please submit any bug reports about this sample to the Bug Reporting <http://developer.apple.com/bugreporter> page.