Question

I write JSON to my file :

NSData *jsonData = [[CJSONSerializer serializer] serializeObject:dictionary error:&error];
[jsonData writeToURL:[NSURL fileURLWithPath:[NSString stringWithFormat:@"%@%@",
NSTemporaryDirectory(), @"file.json"]] atomically:YES];

But how do i read it back?

I tried load the file into NSData, and convert to a NSDictionary like so

    // uses toll-free bridging for data into CFDataRef and CFPropertyList into NSDictionary
CFPropertyListRef plist =  CFPropertyListCreateFromXMLData(kCFAllocatorDefault, (CFDataRef)data,
                                                           kCFPropertyListImmutable,
                                                           NULL);
// we check if it is the correct type and only return it if it is
if ([(id)plist isKindOfClass:[NSDictionary class]])
{
    return [(NSDictionary *)plist autorelease];
}
else
{
    // clean up ref
    CFRelease(plist);
    return nil;
}

But it crashed because i think NSData is not a plist.

Has CJSONSerializer got a method to extract the data from the file and help me convert it to a dictionary?

Thanks,
-Code

Answer 1

You use a serializer to convert an object to JSON, and deserializer for the opposite direction. And indeed TouchJSON has a CJSONDeserializer class:

[[CJSONDeserializer deserializer] deserialize:data error:NULL];