SpotLight Api

                    ////////////AppController.h////////////

#import <Cocoa/Cocoa.h>

@interface AppController : NSObject <NSMetadataQueryDelegate> {
    NSMetadataQuery *query;
    NSString *searchKey;
    BOOL searchContent;
}

- (void)queryNote:(NSNotification *)note;
- (void)setSearchText:(NSString *)text;

@property(retain) NSMetadataQuery *query;
@property(copy) NSString *searchKey;
@property BOOL searchContent;

@end

                    ////////////AppController.m////////////

#import "AppController.h"

@implementation AppController

+ (void)initialize {
    //Doing nothing for now
}

- (id)init {
    if (self = [super init]) {
        self.searchKey = @"";

        self.query = [[[NSMetadataQuery alloc] init] autorelease];
        NSNotificationCenter *nf = [NSNotificationCenter defaultCenter];
        [nf addObserver:self selector:@selector(queryNote:) name:nil object:self.query];

        [self.query setSortDescriptors:[NSArray arrayWithObject:[[[NSSortDescriptor alloc] initWithKey:(id)kMDItemFSName ascending:YES] autorelease]]];

        [self.query setGroupingAttributes:[NSArray arrayWithObjects:(id)kMDItemKind, (id)kMDItemFSSize, nil]];
        [self.query setDelegate:self];
    }
    return self;
}

- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    [query release];
    [searchKey release];
    [super dealloc];
}

@synthesize query;

- (void)queryNote:(NSNotification *)note {
    NSLog(@"%@",note.name);
}

- (void)createSearchPredicate {

    NSPredicate *predicateToRun = nil;
    if (self.searchContent) {
           NSString *predicateFormat = @"kMDItemTextContent like[c] %@";
        predicateToRun = [NSPredicate predicateWithFormat:predicateFormat, self.searchKey];
    }

    NSUInteger options = (NSCaseInsensitivePredicateOption|NSDiacriticInsensitivePredicateOption);
    NSPredicate *compPred = [NSComparisonPredicate
                predicateWithLeftExpression:[NSExpression expressionForKeyPath:@"*"]
                            rightExpression:[NSExpression expressionForConstantValue:self.searchKey]
                                   modifier:NSDirectPredicateModifier
                                       type:NSLikePredicateOperatorType
                                    options:options];

    if (self.searchContent) {
        predicateToRun = [NSCompoundPredicate orPredicateWithSubpredicates:[NSArray arrayWithObjects:compPred, predicateToRun, nil]];
    } else {

        predicateToRun = compPred;
    }

    NSPredicate *emailExclusionPredicate = [NSPredicate predicateWithFormat:@"(kMDItemContentType != 'com.apple.mail.emlx') && (kMDItemContentType != 'public.vcard')"];
    predicateToRun = [NSCompoundPredicate andPredicateWithSubpredicates:[NSArray arrayWithObjects:predicateToRun, emailExclusionPredicate, nil]];

    [self.query setPredicate:predicateToRun];
    [self.query startQuery];
}

- (void)setSearchContent:(BOOL)value {
    if (searchContent != value) {
        searchContent = value;
        [self createSearchPredicate];
    }
}

- (BOOL)searchContent {
    return searchContent;
}

- (void)setSearchText:(NSString *)text
{
    self.searchKey = text;
}
- (void)setSearchKey:(NSString *) value {
    if (searchKey != value) {
        NSLog(value);
        [searchKey release];
        searchKey = [value copy];
        [self createSearchPredicate];
    }
}

- (NSString *)searchKey {
    return [[searchKey retain] autorelease];
}

- (void)tableViewDoubleClick:(id)path {
    [[NSWorkspace sharedWorkspace] openFile:path];
}

@end

                    ////////////main.cpp////////////
AppController* testObj = [[AppController alloc] init];
[testObj setSearchText:@"*.txt"];