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Objective-C Memo

/ Published in: Objective C

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mdimporterã€kMDItemTextContent

------------ SpotlightTextContentRetriever.h

@interface SpotlightTextContentRetriever : NSObject {

}
+(void)initialize;
+(NSMutableArray* )metaDataOfFileAtPath:(NSString*)targetFilePath;
+(NSString* )textContentOfFileAtPath:(NSString*)targetFilePath;
+(NSMutableDictionary*)executeMDImporterAtPath:(NSString*)mdimportPath forPath:(NSString*)path uti:(NSString*)uti;

@end

------------ SpotlightTextContentRetriever.m
//
// SpotlightTextContentRetriever.m
// SpotInside
//
// Created by Masatoshi Nishikata on 06/11/22.
// Copyright 2006 __MyCompanyName__. All rights reserved.
//

/*
Using codes from Apple's BasicPlugin
----------------------------------

Description: Basic CFPlugIn sample code shell, Carbon API

Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
("Apple") in consideration of your agreement to the following terms, and your
use, installation, modification or redistribution of this Apple software
constitutes acceptance of these terms. If you do not agree with these terms,
please do not use, install, modify or redistribute this Apple software.

In consideration of your agreement to abide by the following terms, and subject
to these terms, Apple grants you a personal, non-exclusive license, under Appleâ€™s
copyrights in this original Apple software (the "Apple Software"), to use,
reproduce, modify and redistribute the Apple Software, with or without
modifications, in source and/or binary forms; provided that if you redistribute
the Apple Software in its entirety and without modifications, you must retain
this notice and the following text and disclaimers in all such redistributions of
the Apple Software. Neither the name, trademarks, service marks or logos of
Apple Computer, Inc. may be used to endorse or promote products derived from the
Apple Software without specific prior written permission from Apple. Except as
expressly stated in this notice, no other rights or licenses, express or implied,
are granted by Apple herein, including but not limited to any patent rights that
may be infringed by your derivative works or by other works in which the Apple
Software may be incorporated.

The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
COMBINATION WITH YOUR PRODUCTS.

IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
(INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include ï¼œCarbon/Carbon.hï¼ž
#include ï¼œCoreFoundation/CoreFoundation.hï¼ž
#include ï¼œCoreFoundation/CFPlugInCOM.hï¼ž
#import "SpotlightTextContentRetriever.h"

typedef struct PlugInInterfaceStruct {
IUNKNOWN_C_GUTS;
Boolean (*GetMetadataForFile)(void* myInstance,
CFMutableDictionaryRef attributes,
CFStringRef contentTypeUTI,
CFStringRef pathToFile);

} MDImporterInterfaceStruct;

static MDImporterInterfaceStruct **mdimporterInterface = NULL;

/*
typedef Boolean (*getMetadataForFileFunction)(void* thisInterface,
CFMutableDictionaryRef attributes,
CFStringRef contentTypeUTI,
CFStringRef pathToFile);

@implementation SpotlightTextContentRetriever

static NSArray* mdimporterArray;

+(void)initialize
{
// Get and store MDImporter list
NSTask *task = [[NSTask alloc] init];
NSPipe *messagePipe = [NSPipe pipe];

[task setLaunchPath:@"/usr/bin/mdimport"];
[task setArguments:[NSArray arrayWithObjects: @"-L" ,nil]];

[task setStandardError : messagePipe];
[task launch];
[task waitUntilExit];

NSData *messageData = [[messagePipe fileHandleForReading] availableData];

NSString* message;
message = [[[NSString alloc] initWithData:messageData
encoding:NSUTF8StringEncoding] autorelease];

[task release];

// Cut unwanted string

NSRange firstReturn = [message rangeOfString:@"Â¥n"];
NSString* arrayStr = [message substringFromIndex: firstReturn.location-1];

// Convert string to array
mdimporterArray = [[arrayStr propertyList] retain];

/*
// Convert percentage encoded string
int hoge;
NSMutableArray* array = [NSMutableArray array];
for( hoge = 0; hoge < [tempArray count]; hoge++ )
{
NSString* aPath = [tempArray objectAtIndex:hoge];
aPath = [aPath stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];

[array addObject:aPath ];

}
mdimporterArray = [[NSArray arrayWithArray: array ] retain];
*/
//NSLog(@"mdimporterArray %@", [mdimporterArray description]);

}

+(NSMutableArray* )metaDataOfFileAtPath:(NSString*)targetFilePath
{
// Get UTI of the given file

targetFilePath = [targetFilePath stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];
NSURL* anUrl = [NSURL URLWithString: targetFilePath];
FSRef ref;
CFURLGetFSRef(anUrl,&ref);
CFTypeRef outValue;
LSCopyItemAttribute (
&ref,
kLSRolesAll,
kLSItemContentType,
&outValue
);

if( outValue == nil ) return nil;

NSString* uti = [NSString stringWithString:outValue];
CFRelease(outValue);

//NSLog(@"uti %@",uti);

//----------------

//Get handlers that can handle the file
CFArrayRef ha = LSCopyAllRoleHandlersForContentType (
uti,
kLSRolesAll
);
NSArray* handlerArray = [NSArray arrayWithArray: ha];
CFRelease(ha);

//NSLog(@"handlers %@",[handlerArray description]);

//----------------

//Evaluate

int hoge;
for( hoge = 0; hoge < [mdimporterArray count]; hoge++ )
{
NSString* mdimporterPath = [mdimporterArray objectAtIndex:hoge];
NSBundle* bndl = [NSBundle bundleWithPath: mdimporterPath ];

if( bndl != nil )
{

int piyo;
for( piyo = 0; piyo < [handlerArray count]; piyo++ )
{
NSString* aHandler = [handlerArray objectAtIndex:piyo];

//NSLog(@"Compareing %@, %@ ",aHandler, [bndl bundleIdentifier]);

if( [aHandler isEqualToString:[bndl bundleIdentifier] ] )
{

//NSLog(@"Executing mdimporterPath %@ for targetFilePath %@",mdimporterPath,targetFilePath);

// found one mdimporter
NSMutableDictionary* attributes =
[SpotlightTextContentRetriever executeMDImporterAtPath:mdimporterPath
forPath:targetFilePath
uti:uti];

if( [attributes objectForKey:kMDItemTextContent] != nil )
return attributes;

}
}

}else
{
//NSLog(@"bndl is null");

}

}
/*
// use text mdimporter if appropriate importer cannot be found
///System/Library/Spotlight/RichText.mdimporter

//NSLog(@"%@",uti);
NSMutableDictionary* attributes =
[SpotlightTextContentRetriever executeMDImporterAtPath:@"/System/Library/Spotlight/RichText.mdimporter"
forPath:targetFilePath
uti:uti];

return attributes;
*/

return nil;

}

+(NSString* )textContentOfFileAtPath:(NSString*)targetFilePath
{

NSMutableDictionary* attributes =
[SpotlightTextContentRetriever metaDataOfFileAtPath:targetFilePath];

id textContent = [attributes objectForKey:kMDItemTextContent];
if( [textContent isKindOfClass:[NSString class]] )
{
//NSLog(@"%@",textContent);
return textContent;
}

return nil;
}

+(NSMutableDictionary*)executeMDImporterAtPath:(NSString*)mdimportPath forPath:(NSString*)path uti:(NSString*)uti
{
mdimportPath = [mdimportPath stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];

NSMutableDictionary* attributes = nil;
CFBundleRef bundle;

CFURLRef url = CFURLCreateWithString (
nil,
mdimportPath,
nil
);

if( url == nil ) return nil;

/*
NSLog(@"start executeMDImporterAtPath");

NSLog(@"Execute GetMetadataForFile");
NSLog(@"uti %@",uti);
NSLog(@"path %@",path);
NSLog(@"mdimport %@",mdimportPath );
*/

// Create CFPlugInRef

CFPlugInRef plugin = CFPlugInCreate(NULL, url);
CFRelease(url);

if (!plugin)
{
//NSLog(@"Could not create CFPluginRef.Â¥n");
return nil;
}

// The plug-in was located. Now locate the interface.

BOOL foundInterface = NO;
CFArrayRef factories;

// See if this plug-in implements the Test type.
factories = CFPlugInFindFactoriesForPlugInTypeInPlugIn( kMDImporterTypeID, plugin );

// If there are factories for the Test type, attempt to get the IUnknown interface.
if ( factories != NULL )
{
CFIndex factoryCount;
CFIndex index;

factoryCount = CFArrayGetCount( factories );
if ( factoryCount > 0 )
{
for ( index = 0 ; (index < factoryCount) && (foundInterface == false) ; index++ )
{
CFUUIDRef factoryID;

// Get the factory ID for the first location in the array of IDs.
factoryID = (CFUUIDRef) CFArrayGetValueAtIndex( factories, index );
if ( factoryID )
{
IUnknownVTbl **iunknown;

// Use the factory ID to get an IUnknown interface. Here the plug-in code is loaded.
iunknown = (IUnknownVTbl **) CFPlugInInstanceCreate( NULL, factoryID, kMDImporterTypeID );

if ( iunknown )
{
// If this is an IUnknown interface, query for the test interface.
(*iunknown)->QueryInterface( iunknown, CFUUIDGetUUIDBytes( kMDImporterInterfaceID ), (LPVOID *)( &mdimporterInterface ) );

// Now we are done with IUnknown
(*iunknown)->Release( iunknown );

if ( mdimporterInterface )
{
// We found the interface we need
foundInterface = true;
}
}
}
}
}
}

CFRelease( factories );

if ( foundInterface == false )
{
}
else
{
attributes = [NSMutableDictionary dictionary];
path = [path stringByReplacingPercentEscapesUsingEncoding: NSUTF8StringEncoding];

//NSLog(@"start getMetadataForFile CFPlugin");

(*mdimporterInterface)->GetMetadataForFile( mdimporterInterface,
attributes,
uti,
path);
//NSLog(@"%@",[attributes description]);

(*mdimporterInterface)->Release( mdimporterInterface );

}

// Finished

CFRelease( plugin );
plugin = NULL;

return attributes;
}

@end

URL: http://homepage.mac.com/mnishikata/page2/page2.html

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