The UInt32Array structure is defined as follows.

 typedef struct _UInt32Array {
   [range(0, MAX_RPC_UINT32_ARRAY_COUNT)] 
     DWORD count;
   [size_is(count)] DWORD* ptr;
 } UInt32Array;

count: An unsigned 32-bit integer that contains the number of unsigned 32-bit integers pointed to by ptr.

ptr: A pointer to an array of unsigned 32-bit integers.