To make check boxes act like radio buttons (mutually exclusive)

If you have a list control in your dialog with the
LVS_EX_CHECKBOXES style, you can make the check boxes to act like
radiobuttons by adding two lines of code.. First map the
LVN_ITEMCHANGED event of the list control from the class wizard
and add the code shown


void CListDlg::OnItemchangedMylist(NMHDR* pNMHDR, LRESULT* pResult)
{
NM_LISTVIEW* pNMListView = (NM_LISTVIEW*)pNMHDR;

/* If the event is not fired because of any change in individual items then the oldstate and
newstate members of pNMListView are not used. So check for that.*/

if (!pNMListView->uOldState && !pNMListView->uNewState)
return;

// m_listctl is the member variable of the dialog which is of type CListCtl.
BOOL bChecked = ListView_GetCheckState(m_listctl.m_hWnd, pNMListView->iItem);

// if it’s checked uncheck everything else.
int nCount;

if (bChecked)
for(nCount=0;nCount<m_listctl.GetItemCount();nCount++)
if(nCount != pNMListView->iItem)
m_listctl.SetCheck(nCount, FALSE);
}

Date Last Update: February 1, 1999

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