Adding structs to arrays in cocoa

spiffster

I want to store some NSPoints in an array. When I try to use the NSMutableArray:addObject method, the compiler gives me a bad arguement error. Is there a way to add structs to a NSMutableArray, or how else can i acomplish this?

amitofu

You could create an object with a single field of type NSPoint and add that object to the array. I don't know if this is the most, elegant solution, however. You should try posting your question to a cocoa-dev mailing list.



-Chris

spiffster

I'll try MacNN...

josef k.

Try using [NSValue valueWithPoint:thePoint] to create objects from NSPoint structures.



Edit: spelling



[ 01-27-2003: Message edited by: Josef K. ]</p>

thuh freak

Seeing your code might help, but I'd guess that you tried to add objects, and not pointers to objects. I think you need to pass pointers to addObject. Example:



// this isn't really good code, but it gets to my point.

NSPoint mypoint;

NSMutableArray *myArray = [[NSMutableArray alloc] init];

[myArray addObject:&mypoint];

josef k.

NSPoints are not Objective C objects. Check out NSGeometry.h:



typedef struct _NSPoint {

float x;

float y;

} NSPoint;



typedef NSPoint *NSPointPointer;

typedef NSPoint *NSPointArray;

dfiler

[quote]Originally posted by Josef K.:

<strong>NSPoints are not Objective C objects. Check out NSGeometry.h:



typedef struct _NSPoint {

float x;

float y;

} NSPoint;



typedef NSPoint *NSPointPointer;

typedef NSPoint *NSPointArray;</strong><hr></blockquote>Yes, this is the key. NSArrays can only contain objects. Thus, you'll need to make the point an object with a statement like [NSValue valueWithPoint:thePoint]. NSValues are objects while NSPoints are not. Weird aye?