ListView_SetItemCountEx(0x7fffffff) don't work?

[royercomp]

I Use Virual List view style,(LVS_OWNERDATA|LVS_REPORT)
Then I want to Set Large itemcount(0x7fffffff) to the ListView,
I found it don;t work,to getItemCount,it return 0,
how many the max count of virtual view?
in SDK document say use virtual list view can support an item count up to DWORD ?
HOW TO IMPLEMENT THIS?
use cache? but if item count is not correct,how to use cache?