How can I find dimension cell of clistctrl

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C++

MFC

I have a derived class of CListCtrl and I must find the dimension of a cell. I tried to use GetItemRect but in this way, I have the dimension only of item and not of cell. How must I do it?

What I have tried:

I tried in this way:

BOOL MyListCtrl::GetDimensionCell(INT_PTR &nRow, 
INT_PTR &nCol, RECT &cellRect, CPoint &point)
{
	INT_PTR		nC, nI, nSX, nDX, nDimX;
	LVCOLUMN	Column;
	RECT		rect;

	nRow = -1;
	nCol = -1;
	for (nI = 0; nI<GetItemCount(); nI++)
	{
		this->GetItemRect((int)nI, &rect, LVIR_LABEL);
		if ((rect.top <= point.y) && (rect.bottom >= point.y))	 
        // mi trovo in questo ITEM, trovo ora quale colonna.
		{
			nC = 0;
			nSX = 0;
			Column.mask = LVCF_WIDTH;
			while (GetColumn((int)nC, &Column))
			{
				nDimX = Column.cx;
				nDX = nSX + nDimX;	// dx e sx della cella.
				if ((point.x >= nSX) && (point.x <= nDX))
				{
					cellRect.top = (rect.top + rect.bottom) / 2 - 15;
					cellRect.bottom = (rect.top + rect.bottom) / 2 + 15;
					cellRect.left = (int)nSX;
					cellRect.right = (int)nDX;
					nRow = nI;
					nCol = nC;
					return TRUE;
				}
				nSX = nDX;
				nC++;
			}
		}
	}
	return FALSE;
}