iphone - Converting a NSObject into NSData

Question

I am having an issue in converting a NSObject into NSData. I have a class which inherits NSObject.

When i tried to convert the object of that particular class into NSData as follows :

NSData *dataOnObject = [NSKeyedArchiver archivedDataWithRootObject:classObject];

but it gives out exception stating that -[classObject encodeWithCoder:]: unrecognized selector sent to instance ..

I have also added the object to a newly created array as

NSMutableArray *wrapperedData = [NSMutableArray arrayWithObject: classObject];
NSData *dataOnObject = [NSKeyedArchiver archivedDataWithRootObject:value];

But still , its giving out exception.

So I need to extract the bytes from the object classObject.

Any help would be greatly appreciated ...

awaiting for your reply ...

Answer 1

You must implement for your own object such as:

- (void)encodeWithCoder:(NSCoder *)aCoder
{
    [aCoder encodeObject:self.name forKey:@"name"];
    [aCoder encodeInt:self.age forKey:@"age"];
    [aCoder encodeObject:self.email forKey:@"email"];
    [aCoder encodeObject:self.password forKey:@"password"];
}
BOOL success = [NSKeyedArchiver archiveRootObject:person toFile:archiveFilePath];

and:

- (id)initWithCoder:(NSCoder *)aDecoder
{
    if (self = [super init]) {
        self.name = [aDecoder decodeObjectForKey:@"name"];
        self.age = [aDecoder decodeIntForKey:@"age"];
        self.email = [aDecoder decodeObjectForKey:@"email"];
        self.password = [aDecoder decodeObjectForKey:@"password"];
    }
    return self;
}
Person *unarchivePerson = [NSKeyedUnarchiver unarchiveObjectWithFile:archiveFilePath];