NSMetadataQuery数据库

Posted 2021-02-27

NSMetadataQuery
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NSMetadataQuery seems to have bugs and unable to get NSMetadataQueryResultContentRelevanceAttribute value.
 
Use MDQueryRef instead.
 
 
 
#import
 
@interface MyDocument : NSDocument
{
IBOutlet id field;
 
MDQueryRef _query;
 
 
}
- (IBAction)search:(id)sender;
@end
 
---------
 
#import "MyDocument.h"
 
 
@implementation MyDocument
 
- (id)init
{
self = [super init];
if (self) {
}
return self;
}
 
- (NSString *)windowNibName
{
return @"MyDocument";
}
 
- (void)windowControllerDidLoadNib:(NSWindowController *) aController
{
[super windowControllerDidLoadNib:aController];
 
}
 
 
- (IBAction)search:(id)sender
{
 
if( [[field stringValue] isEqualToString:@"" ] ) return;
 
 
NSString *predicateFormat = @"(kMDItemTextContent == "?%@*"c) && (kMDItemContentType != 'com.apple.mail.emlx') && (kMDItemContentType != 'public.vcard')";
 
_query = MDQueryCreate (
NULL,
[NSString stringWithFormat:predicateFormat,[field stringValue]],
[NSArray arrayWithObjects:kMDQueryResultContentRelevance,
kMDItemPath, kMDItemDisplayName, kMDItemFSName,nil ],
[NSArray arrayWithObject:kMDQueryResultContentRelevance]
);
 
 
MDQuerySetSearchScope (
_query,
[NSArray arrayWithObject:kMDQueryScopeComputer ],
0
);
 
 
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(finish) name:kMDQueryDidFinishNotification object:_query];
 
 
 
MDQueryExecute (
_query,
kMDQuerySynchronous
);
 
 
 
}
 
 
-(void)finish
{
 
[[NSNotificationCenter defaultCenter] removeObserver:self
name:nil
object:_query];
 
MDItemRef miref;
 
CFIndex idx;
 
 
idx = MDQueryGetResultCount(_query);
 
 
CFIndex hoge;
for( hoge = 0; hoge < idx; hoge++ )
{
 
miref = MDQueryGetResultAtIndex( _query, hoge);
 
 
NSString* name = (NSString*)MDItemCopyAttribute (
miref,
kMDItemFSName
);
NSString* path = (NSString*)MDItemCopyAttribute (
miref,
kMDItemPath
);
NSString* displayname = (NSString*)MDItemCopyAttribute (
miref,
kMDItemDisplayName
);
NSNumber* score = (NSNumber*)MDQueryGetAttributeValueOfResultAtIndex (
_query,
kMDQueryResultContentRelevance,
hoge
);
 
if( score != nil )
NSLog(@"score %f",[score floatValue]);
 
 
}
 
 
}
 
@end