isEqual, isEqualToString, compare behaviors



am not being able to explain the output of the following code; code and output pasted below.

#import <Cocoa/Cocoa.h>

int main (int argc, const char * argv[]) {
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
NSComparisonResult compareResult = 0;
id fileAttributes = nil;
if(fileAttributes = [[NSFileManager defaultManager] fileAttributesAtPath:@"/Applications"
traverseLink:FALSE]) {
NSLog(@"[fileAttributes objectForKey:NSFileType] = %@; NSDirectoryFileType = %@",[fileAttributes objectForKey:NSFileType],NSDirectoryFileType);
compareResult = [(NSString *) [fileAttributes objectForKey:NSFileType] isEqualToString:NSDirectoryFileType];
NSLog(@"[(NSString *) [fileAttributes objectForKey:NSFileType] isEqualToString:NSDirectoryFileType] = %d",compareResult);
compareResult = [(NSString *) [fileAttributes objectForKey:NSFileType] compare:NSDirectoryFileType];
NSLog(@"[(NSString *) [fileAttributes objectForKey:NSFileType] compare:NSDirectoryFileType] = %d",compareResult);
compareResult = [[fileAttributes objectForKey:NSFileType] isEqual:NSDirectoryFileType];
NSLog(@"[[fileAttributes objectForKey:NSFileType] isEqual:NSDirectoryFileType] = %d",compareResult);
compareResult = [[fileAttributes objectForKey:NSFileType] isEqual:[fileAttributes objectForKey:NSFileType]];
NSLog(@"[[fileAttributes objectForKey:NSFileType] isEqual:[fileAttributes objectForKey:NSFileType]] = %d",compareResult);
compareResult = [NSDirectoryFileType isEqual:NSDirectoryFileType];
NSLog(@"[NSDirectoryFileType isEqual:NSDirectoryFileType] = %d",compareResult);
}
[pool drain];
return 0;
}

/***********...

******* output (target system OS X 10.5.6, using XCode 3.0)*********************/
[fileAttributes objectForKey:NSFileType] = NSFileTypeDirectory; NSDirectoryFileType = NXDirectoryFileType
[(NSString *) [fileAttributes objectForKey:NSFileType] isEqualToString:NSDirectoryFileType] = 0 //This shouldn't have been true. because both strings are different.
[(NSString *) [fileAttributes objectForKey:NSFileType] compare:NSDirectoryFileType] = -1 //OK they are not same. fine.
[[fileAttributes objectForKey:NSFileType] isEqual:NSDirectoryFileType] = 0 //How come ?
[[fileAttributes objectForKey:NSFileType] isEqual:[fileAttributes objectForKey:NSFileType]] = 1 //This cannot be true. An object should be equal to itself.
[NSDirectoryFileType isEqual:NSDirectoryFileType] = 1 //This cannot be true. An object should be equal to itself.

any body knows why this behavior.

_______________________________________________

Cocoa-dev mailing list (Cocoa-dev@xxxxxxxxxxxxxxx)

Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com

Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/cocoa-dev/maillists%40codeha.us

This email sent to maillists@xxxxxxxxx



Privacy