Get image resource handle in filter plugin

Hello all,

In the past, I have written filter plugin which reads slices data, using PIGetSlices()

Now I need to get the information about layer comps. As far as I understand, it's image resource with 1065 resource id. There's no symbol property defined like for slices or xmp, so I can't use getPropertyProc unfortunately.

Is it still possible to get this handle in plugin?

I've tried this, but it returns 0.

Handle  layerCompsHandle;

size_t outSize;

int32 rezID = 1065;

layerCompsHandle = HostGetResource(gFilterRecord->handleProcs, kPhotoshopSignature, rezID, &outSize);

any ideas would be appreciated

thanks!