The StringArray structure is defined as follows.

 typedef struct _StringArray {
   [range(0, MAX_RPC_STRING_ARRAY_COUNT)] 
     DWORD count;
   [size_is(count), string] LPWSTR* ptr;
 } StringArray;

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

ptr: A pointer to an array of null-terminated Unicode (as specified in [UNICODE]) strings.