The CAPROPVARIANT structure defines a counted array of PROPVARIANT (section 2.2.13.2) values.

 typedef struct tagCAPROPVARIANT {
   unsigned long cElems;
   [size_is(cElems )] PROPVARIANT* pElems;
 } CAPROPVARIANT;

cElems: MUST be set to the total number of elements of the array.

pElems: An array of PROPVARIANT (section 2.2.13.2) values.