Darwin support for Objective-C and Foundation framework

[Eric Norum <norume@aps.anl.gov>]

I've committed changes to support compilation of Objective C source 
files on Mac OS X.  Applications can also use code from the Foundation 
framework.

To include an Objective-C source file in an application just add it to 
the source list in the application Makefile:
example_SRCS += exampleObjC.m

To link the Foundation framework into an application add the following 
as well:
example_LDFLAGS += -framework Foundation


Here's a short example showing how the Foundation framework can be used 
to send AppleScript messages to other applications:

/*
 * exampleAppleScriptRecord.m
 *
 * Simple Objective-C/AppleScript subroutine record
 *
 * To use this record in an application:
 *
 * 1) Make the following changes to the application Makefile:
 *    - Add exampleAppleScriptRecord.m to the application SRCS.
 *    - Add -framework Foundation to the application LDFLAGS.
 * 2) Add the following line to the application database description:
 *      function(exampleAppleScriptProcess)
 * 3) Add a record to the application database:
 *      record(sub,"setVolume")
 *      {
 *          field(SNAM,"exampleAppleScriptProcess")
 *      }
 */
#import <Foundation/Foundation.h>
#include <subRecord.h>
#include <alarm.h>
#include <errlog.h>
#include <recGbl.h>

/*
 * Shim between EPICS and NSAppleScript class.
 */
long
exampleAppleScriptProcess(struct subRecord *psub)
 {
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    NSDictionary *err;
    NSAppleScript *nsa;

    nsa = [[NSAppleScript alloc] initWithSource:[NSString stringWithFormat:
                @"tell application \"Finder\" to set volume %g\n", 
psub->A]];
    if ([nsa executeAndReturnError:&err] == nil) {
        errlogPrintf("Failed to run AppleScript: %s\n",
                        [[err objectForKey:NSAppleScriptErrorMessage] 
cString]);
        recGblSetSevr(psub, SOFT_ALARM, INVALID_ALARM);
    }
    [nsa release];
    [pool release];
    return 0;
}

--
Eric Norum                                 norume@aps.anl.gov
Advanced Photon Source                     Phone: (630) 252-2793
Argonne National Laboratory