Storing custom structs in Dictionary

[djp_phillips]

I remember watching a video on iTunes U, I cant find it again but someone mentioned that you can't store any kind of object in an NSArray or NSDictionary.

I ran into some trouble trying to save a struct into a dictionary, to make things more complex, the struct had a NSDictionary as one of it's properties.

The error message I get is: incompatible type for argument 1 of 'setObject:forKey:'

Am I correct when I say you can't store a struct in a NSDictionary ?

What workaround would you suggest if that's the case ?

[ZunePod]

Although this is for Mac, it should be the same on iPhone:

Save struct to NSDictionary - Dev Archives

[djp_phillips]

Hi, thanks for the info, I already came across that forum post, it doesn't really help me if I'm honest, I think I have isolated my problem however, it seems storing Dictionaries as objects inside a dictionary is no problem, the problem is only when I try to store a struct, and I think it's something to do with he memory of the struct.

Here is a sample of what I am doing:

This is my struct

typedef struct{
	NSMutableString *value;
	NSDictionary *attributes;
} xmlElement;

In a method of my class I have:

	xmlElement elem;
	elem.value = nodeValue;
	elem.attributes = nodeAttributes;
	[nodeValues setObject:elem forKey:xmlPath];

* nodeValues is a NSMutableDictionary and xmlPath is an NSMutableString

I think that maybe, I need to specify retain for the elem ?

<SOLUTION>
I had to convert the C-struct to objectif C with the NSValue class, and use getValue on that to retrieve the struct.