It s a common pattern used for allocating items dynamically:
int items = 5;
int cb = sizeof(FILEGROUPDESCRIPTOR) + (items - 1) * sizeof(FILEDESCRIPTOR);
LPFILEGROUPDESCRIPTOR lp = (LPFILEGROUPDESCRIPTOR)new BYTE[cb];
lp->cItems = items;
for(int i = 0; i < items; i++)
{
lp->fgd[i].blah = blah;
}
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