Beginning Objective-C pdf - EBook Free Download

CHAPTER 5: Using the Filesystem 121{}if ( error != NULL )*error = [NSError errorWithDomain: NSPOSIXErrorDomaincode: errnouserInfo: nil];return ( NO );return ( YES );}- (NSSet *) extendedAttributeNames: (NSError **) error{if ( [self isFileURL] == NO ){if ( error != NULL )*error = [NSError errorWithDomain: NSPOSIXErrorDomaincode: EINVALuserInfo: nil];return ( nil );}const char * path = [[[self filePathURL] path] fileSystemRepresentation];ssize_t size = listxattr(path, NULL, 0, 0);if ( size == 0 )return ( nil );if ( size < 0 ){if ( error != NULL )*error = [NSError errorWithDomain: NSPOSIXErrorDomaincode: errnouserInfo: nil];return ( nil );}NSMutableSet * result = [NSMutableSet new];NSMutableData * buffer = [[NSMutableData alloc] initWithLength: size];if ( listxattr(path, [buffer mutableBytes], size, 0) < 0 ){if ( error != NULL )*error = [NSError errorWithDomain: NSPOSIXErrorDomaincode: errnouserInfo: nil];return ( nil );}const char * p = [buffer bytes];const char * e = p + size;while ( p < e ){[result addObject: [NSString stringWithUTF8String: p]];}www.it-ebooks.info