Problems serializing a dictionary with TouchJson

Question

i'm developing a small app for the ipad and i'm trying to serialize a dictionary to NSData to save in the disk. I'm using with framework TouchJson. And example of my example structure:

{
line =     {
    78986928 =         (
        "NSPoint: {442, 266}",
        (...)
        "NSPoint: {370, 634}"
    );
};

}

The structure of my dictionary is: an dictionary with dictionaries inside. This dictionaries have a string (ID) and an NSMutableArray with an NSValue.

The line of code is that i'm using is:

NSData *jsonData = [[CJSONSerializer serializer] serializeObject:templates error:&error];

The error that the variable error give me is:

2011-03-23 10:12:12.957 GestureFramework[286:207] Error Domain=TODO_DOMAIN Code=-1 "Could not serialize object '{
line =     {
    78986928 =         (
        "NSPoint: {442, 266}",
        (...)
        "NSPoint: {370, 634}"
    );
};
}'" UserInfo=0x4e27aa0 {NSLocalizedDescription=Could not serialize object '{
    line =     {
        78986928 =         (
            "NSPoint: {442, 266}",
            (...)
            "NSPoint: {370, 634}"
        );
    };
}'}

Thnx in advance

Answer 1

TouchJSON supports serializing the following types:

• NSNull
• NSNumber
• NSString
• NSArray
• NSDictionary
• NSData

If you'd like to serialize another type you'll need to implement -(NSData*)JSONDataRepresentation (either on a subclass or category).

Here's an example that I used for NSDate:

@interface NSDate (JSONDataRepresentation)
- (NSData*)JSONDataRepresentation; 
@end

.

@implementation NSDate (JSONDataRepresentation)
- (NSData*)JSONDataRepresentation 
{
    return [@"\"didn't want to waste the space to do the real conversion\"" dataUsingEncoding: NSUTF8StringEncoding]; 
}
@end