cog/FileTree/PathWatcher.m

//
//  PathWatcher.m
//  Cog
//
//  Created by Vincent Spader on 2/17/08.
//  Copyright 2008 __MyCompanyName__. All rights reserved.
//

#import "PathWatcher.h"

static void myFSEventCallback(
    ConstFSEventStreamRef streamRef,
    void *clientCallBackInfo,
    size_t numEvents,
    void *eventPaths,
    const FSEventStreamEventFlags eventFlags[],
    const FSEventStreamEventId eventIds[])
{
	int i;
	char **paths = eventPaths;
	PathWatcher *pathWatcher = (__bridge PathWatcher *)clientCallBackInfo;
 
	printf("Callback called\n");
    for (i=0; i<numEvents; i++) {
		NSString *pathString = [[NSString alloc] initWithUTF8String:paths[i]];
		[[pathWatcher delegate] pathDidChange:pathString];
   }
}

@implementation PathWatcher

- (void)cleanUp
{
	if (stream) {
		FSEventStreamStop(stream);
		FSEventStreamInvalidate(stream);
		FSEventStreamRelease(stream);
		stream = NULL;
	}
	if (context) {
	     free(context);
		 context = NULL;
	}
}

- (void)setPath:(NSString *)path
{
	[self cleanUp];
	
	//Create FSEvent stream
    NSArray *pathsToWatch = @[path];

    context = (FSEventStreamContext*)malloc(sizeof(FSEventStreamContext));
    context->version = 0;
    context->info = (__bridge void *)self;
    context->retain = NULL;
    context->release = NULL;

    // Create the stream, passing in a callback
    stream = FSEventStreamCreate(NULL,
        &myFSEventCallback,
		context,
        (__bridge CFArrayRef)pathsToWatch,
        kFSEventStreamEventIdSinceNow, // Or a previous event ID
        1.0, //latency in seconds
        kFSEventStreamCreateFlagNone // Watch this and all its subdirectories
    );
	
    FSEventStreamScheduleWithRunLoop(stream, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);	
	
	FSEventStreamStart(stream);
}

- (void)setDelegate:(id)d
{
	delegate = d;
}
- (id)delegate
{
	return delegate;
}

- (void) dealloc
{
	[self cleanUp];
}


@end