LoadOperation.m
/* |
File: LoadOperation.m |
Abstract: NSOperation code for examining image files. |
Version: 1.3 |
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*/ |
#import "LoadOperation.h" |
// key for obtaining the current scan count |
NSString *kScanCountKey = @"scanCount"; |
// key for obtaining the path of an image fiel |
NSString *kPathKey = @"path"; |
// key for obtaining the size of an image file |
NSString *kSizeKey = @"size"; |
// key for obtaining the name of an image file |
NSString *kNameKey = @"name"; |
// key for obtaining the mod date of an image file |
NSString *kModifiedKey = @"modified"; |
// NSNotification name to tell the Window controller an image file as found |
NSString *kLoadImageDidFinish = @"LoadImageDidFinish"; |
@interface LoadOperation () |
{ |
NSURL *loadURL; |
NSInteger ourScanCount; |
} |
@property (retain) NSURL *loadURL; |
@end |
@implementation LoadOperation |
@synthesize loadURL; |
// ------------------------------------------------------------------------------- |
// initWithPath:path |
// ------------------------------------------------------------------------------- |
- (id)initWithURL:(NSURL *)url scanCount:(NSInteger)scanCount |
{ |
self = [super init]; |
if (self) |
{ |
self.loadURL = url; |
ourScanCount = scanCount; |
} |
return self; |
} |
// ------------------------------------------------------------------------------- |
// isImageFile:filePath |
// |
// Uses LaunchServices and UTIs to detect if a given file path is an image file. |
// ------------------------------------------------------------------------------- |
- (BOOL)isImageFile:(NSURL *)url |
{ |
BOOL isImageFile = NO; |
NSString *utiValue; |
[url getResourceValue:&utiValue forKey:NSURLTypeIdentifierKey error:nil]; |
if (utiValue) |
{ |
isImageFile = UTTypeConformsTo((__bridge CFStringRef)utiValue, kUTTypeImage); |
} |
return isImageFile; |
} |
// ------------------------------------------------------------------------------- |
// main: |
// |
// Examine the given file (from the NSURL "loadURL") to see it its an image file. |
// If an image file examine further and report its file attributes. |
// |
// We could use NSFileManager, but to be on the safe side we will use the |
// File Manager APIs to get the file attributes. |
// ------------------------------------------------------------------------------- |
- (void)main |
{ |
if (![self isCancelled]) |
{ |
// test to see if it's an image file |
if ([self isImageFile:loadURL]) |
{ |
// in this example, we just get the file's info (mod date, file size) and report it to the table view |
// |
NSNumber *fileSize; |
[self.loadURL getResourceValue:&fileSize forKey:NSURLFileSizeKey error:nil]; |
NSDate *fileCreationDate; |
[self.loadURL getResourceValue:&fileCreationDate forKey:NSURLCreationDateKey error:nil]; |
NSDateFormatter* formatter = [[NSDateFormatter alloc] init]; |
[formatter setTimeStyle:NSDateFormatterNoStyle]; |
[formatter setDateStyle:NSDateFormatterShortStyle]; |
NSString *modDateStr = [formatter stringFromDate:fileCreationDate]; |
NSDictionary *info = [NSDictionary dictionaryWithObjectsAndKeys: |
[self.loadURL lastPathComponent], kNameKey, |
[self.loadURL absoluteString], kPathKey, |
modDateStr, kModifiedKey, |
[NSString stringWithFormat:@"%ld", [fileSize integerValue]], kSizeKey, |
[NSNumber numberWithInteger:ourScanCount], kScanCountKey, // pass back to check if user cancelled/started a new scan |
nil]; |
if (![self isCancelled]) |
{ |
// for the purposes of this sample, we're just going to post the information |
// out there and let whoever might be interested receive it (in our case its MyWindowController). |
// |
[[NSNotificationCenter defaultCenter] postNotificationName:kLoadImageDidFinish object:nil userInfo:info]; |
} |
} |
} |
} |
@end |
Copyright © 2012 Apple Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2012-03-27