On Dec 8, 2009, at 6:42 PM, David Duncan wrote:
> More than likely this is a memory management problem. Specifically, you
> probably aren't claiming ownership of the NSData object that you store in
> your instance variable, and thus it is being deallocated out from under you.
I was under the impression that automatic garbage collection was used in Mac OS
X 10.5 and over, so retaining and releasing objects was handled automatically?
This is the initializer method of my Mesh class (I'm using OpenCTM library for
importing triangle meshes):
- (id)initWithContentsOfFile:(NSString *)path
{
self = [super init];
if (self) {
// Create an OpenCTM context and load the mesh from disk.
CTMcontext context = ctmNewContext(CTM_IMPORT);
ctmLoad(context, [path UTF8String]);
// Check OpenCTM errors.
CTMenum error = ctmGetError(context);
if (error != CTM_NONE) {
NSLog(@"OpenCTM error while opening %@: %s (%d)", path,
ctmErrorString(error), error);
ctmFreeContext(context);
[self dealloc];
return nil;
}
// Store the geometry arrays.
_vertices = [NSData dataWithBytes:ctmGetFloatArray(context,
CTM_VERTICES)
length:ctmGetInteger(context, CTM_VERTEX_COUNT) * sizeof(CTMfloat[3])];
_indices = [NSData dataWithBytes:ctmGetIntegerArray(context,
CTM_INDICES)
length:ctmGetInteger(context, CTM_TRIANGLE_COUNT) * sizeof(CTMuint[3])];
// Calculate the bounding sphere radius.
for (CTMuint i = 0; i < ctmGetInteger(context,
CTM_VERTEX_COUNT) * 3; i += 3) {
const CTMfloat x = ctmGetFloatArray(context,
CTM_VERTICES)[i + 0];
const CTMfloat y = ctmGetFloatArray(context,
CTM_VERTICES)[i + 1];
const CTMfloat z = ctmGetFloatArray(context,
CTM_VERTICES)[i + 2];
_radius = MAX(sqrt(x*x + y*y + z*z), _radius);
}
// Release the OpenCTM context.
ctmFreeContext(context);
}
return self;
}
> --
> David Duncan
> Apple DTS Animation and Printing
>
Regards,
Henri Häkkinen
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