void CListDlg::OnItemchangedlist(NMHDR* pNMHDR, LRESULT* pResult) { NM_LISTVIEW* pNMListView = (NM_LISTVIEW*)pNMHDR; *pResult = 0; if (pNMListView->uOldState == 0 && pNMListView->uNewState == 0) return; // No change BOOL bPrevState = (BOOL)(((pNMListView->uOldState & LVIS_STATEIMAGEMASK)>>12)-1); // Old check box state if (bPrevState < 0) // On startup there's no previous state bPrevState = 0; // so assign as false (unchecked) // New check box state BOOL bChecked=(BOOL)(((pNMListView->uNewState & LVIS_STATEIMAGEMASK)>>12)-1); if (bChecked < 0) // On non-checkbox notifications assume false bChecked = 0; if (bPrevState == bChecked) // No change in check box return; // bChecked表示当前item是否checked *pResult = 0; }