Item Count in Item Tooltip

So I'm trying to display the amount of items that are in one item stack in your inventory, and display that text in the item description. So if you have a stack of 99 items and mouseover it, it should say "Count: 99". This is as far as I got and it's not displaying the number correctly. Someone can help?

Code:

if (pItemElem->GetProp()->dwPackMax > 1)
	{
	short nItemNum = pItemElem->m_nItemNum;

	strTemp.Format("\nCount: %d", prj.GetItemProp(pItemElem->m_nItemNum));
	pEdit->AddString(strTemp, dwItemColor[g_Option.m_nToolTipText].dwCommand);
	}