SDI程序，重画菜单的时候，MeasureItem 函数错误！

[pig1210127]

void CMenuEx::MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct)
{
CMenuItemContext * pItem = (CMenuItemContext *)(lpMeasureItemStruct->itemData);
if (pItem->nMenuID == 0) //错误
lpMeasureItemStruct->itemHeight = 10;
else
{
CDC * pDC = AfxGetMainWnd()->GetDC();

CString strText = pItem->strText;
CSize size;

size = pDC->GetTextExtent(pItem->strText);

lpMeasureItemStruct->itemWidth = size.cx + 4;
lpMeasureItemStruct->itemHeight = size.cy + 4;

AfxGetMainWnd()->ReleaseDC(pDC);
}
}

struct CMenuItemContext
{
public:
CString strText;
UINT nMenuID;
UINT U;
};