Problems with NSKeyedArchiver- Simply does not archive at all! - iphone

Question

I am probably not seeing something here, that is why I am asking for help :)
Here is the deal I have a NSMutable array of items that fulfill the NSCoding protocol, but NSKeyedArchiver always fails to archive it... here is my object implementation:
#implementation YTVideo
#synthesize URL,thumb,titulo;
#pragma mark NSCoding
#define kTituloKey #"titulo"
#define kURLKey #"URL"
#define kThumbKey #"thumb"
-(id)initWithData:(NSString *)ktitle :(UIImage *)kThumb :(NSURL *)kURL{
self.titulo = ktitle;
self.thumb = kThumb;
self.URL = kURL;
return self;
}
- (void) encodeWithCoder:(NSCoder *)encoder {
[encoder encodeObject:titulo forKey:kTituloKey];
[encoder encodeObject:URL forKey:kURLKey];
NSData *thumbData = UIImagePNGRepresentation(thumb);
[encoder encodeObject:thumbData forKey:kThumbKey];
}
- (id)initWithCoder:(NSCoder *)decoder {
NSString* ktitulo = [decoder decodeObjectForKey:kTituloKey];
NSURL* kURL = [decoder decodeObjectForKey:kURLKey];
NSData* kThumbdata = [decoder decodeObjectForKey:kThumbKey];
UIImage* kThumb=[UIImage imageWithData:kThumbdata];
return [self initWithData:ktitulo:kThumb:kURL];
}
#end
During the program execution I have a NSMutable array of those objects called videosArray.
then, eventually, I try:
NSString* path =[NSHomeDirectory() stringByAppendingPathComponent:#"teste.wrapit"];
NSLog(#"PATH =%#",path);
bool teste = [NSKeyedArchiver archiveRootObject:videosArray toFile:path];
NSLog(#"aramzenamento:%#",teste ? #"sucesso!" :#"Nope");
BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:path];
NSLog(#"Arquivo armazenado existe?%#",fileExists ?#"Sim":#"Nao");
And I always get a fail on my boolean checks...
Any Ideas where I am completely wrong??
Thanks!!

Answer 1

The problem you're experiencing has nothing to do with NSKeyedArchiver. By the looks of it, you're trying to archive your object at the root-level of your sandbox (the directory returned by NSHomeDirectory()). Try replacing the first line of the second block of code with
NSString *path = [NSHomeDirectory() stringByAppendingPathComponent:#"Documents"];
path = [path stringByAppendingPathComponent:#"teste.wrapit"];
Another (perhaps cleaner) way to get the path of your Documents folder is to use the C function NSSearchPathForDirectoriesInDomains, which returns an array of paths that match the first argument:
NSArray * paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *path = [[paths objectAtIndex:0] stringByAppendingPathComponent:#"teste.wrapit"];
It's worth pointing out that, on iOS, the function NSSearchPathForDirectoriesInDomain is guaranteed to return an NSArray with a single element when you use a built-in constant (like NSDocumentDirectory) for the first argument, so you can safely use objectAtIndex:0 on the array.