Contains: A Cocoa-style wrapper around CFHost.
Written by: DTS
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You can use the object to map from a DNS name to a set of addresses or from a
address to a set of DNS names. To do this:
1. create the QCFHostResolver object with the info you have
2. set a delegate
3. call -start
4. wait for -hostResolverDidFinish: to be called
5. extract the information you need from the resolvedXxx properties
@interface QCFHostResolver : NSObject
- (id)initWithName:(NSString *)name;
// Initialise the object for name-to-address translation.
- (id)initWithAddress:(NSData *)address;
// Initialise the object for address-to-name translation based on a (struct sockaddr)
// embedded in an NSData object.
- (id)initWithAddressString:(NSString *)addressString;
// Initialise the object for address-to-name translation based on an address string.
// properties set up by the various -init routines
@property (nonatomic, copy, readonly ) NSString * name;
@property (nonatomic, copy, readonly ) NSData * address;
@property (nonatomic, copy, readonly ) NSString * addressString;
// properties you can set at any time
@property (nonatomic, weak, readwrite) id<QCFHostResolverDelegate> delegate;
// Starts the resolution process.
// It's not safe to call this is if the resolve is running.
// Cancels a resolve. It's safe to call this redundantly.
// properties that are set when resolution completes
@property (nonatomic, copy, readonly ) NSError * error;
@property (nonatomic, copy, readonly ) NSArray * resolvedAddresses; // of NSData, each containing a (struct sockaddr)
@property (nonatomic, copy, readonly ) NSArray * resolvedAddressStrings; // of NSString
@property (nonatomic, copy, readonly ) NSArray * resolvedNames; // of NSString
@protocol QCFHostResolverDelegate <NSObject>
- (void)hostResolverDidFinish:(QCFHostResolver *)resolver;
// Called when resolution completes succesfully. Either the resolvedAddress[es|Strings]
// or the resolvedNames properties will contain meaningful results depending on whether
// the object was initialised for name-to-address or address-to-name translation.
- (void)hostResolver:(QCFHostResolver *)resolver didFailWithError:(NSError *)error;
// Called when resolution fails. The error parameter reflects the value in the error