How to get all checked items from TreeView in VC++ mfc

void CPDlg::OnTreeClk(NMHDR *pNMHDR, LRESULT *pResult)
NMTREEVIEW& nm = *(LPNMTREEVIEW)pNMHDR;
// which item was selected?
HTREEITEM hItem = m_columnTree.GetTreeCtrl().GetSelectedItem();
temp = m_columnTree.GetItemText(hItem, 0);
MessageBox(temp);
if (!hItem) return;
// the rest of processing code..
I'm new in VC++ .
this code gives only current selected item . but i need to get all checked items from treeView.
kindly help me..

no not unchecked .. the all check box's gone from tree view. which means Treeview without check box.
finally i tried SetCheck
void CPracticesDlg::OnSelchangedTreectrl(NMHDR* pNMHDR, LRESULT* pResult)
NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
// TODO: Add your control notification handler code here
tree_state = 1;//changed
HTREEITEM hItem = m_columnTree.GetTreeCtrl().GetSelectedItem();
BOOL chk = m_columnTree.GetTreeCtrl().GetCheck(hItem);
if (chk == TRUE)
HTREEITEM hmyItem = m_columnTree.GetTreeCtrl().GetSelectedItem();
// Check all of the children of hmyItem.
if (m_columnTree.GetTreeCtrl().ItemHasChildren(hmyItem))
HTREEITEM hNextItem;
HTREEITEM hChildItem = m_columnTree.GetTreeCtrl().GetChildItem(hmyItem);
while (hChildItem != NULL)
hNextItem = m_columnTree.GetTreeCtrl().GetNextItem(hChildItem, TVGN_NEXT);
m_columnTree.GetTreeCtrl().SetCheck(hChildItem, 1);
hChildItem = hNextItem;
else
HTREEITEM hmyItem = m_columnTree.GetTreeCtrl().GetSelectedItem();
// Uncheck all of the children of hmyItem.
if (m_columnTree.GetTreeCtrl().ItemHasChildren(hmyItem))
HTREEITEM hNextItem;
HTREEITEM hChildItem = m_columnTree.GetTreeCtrl().GetChildItem(hmyItem);
while (hChildItem != NULL)
hNextItem = m_columnTree.GetTreeCtrl().GetNextItem(hChildItem, TVGN_NEXT);
m_columnTree.GetTreeCtrl().SetCheck(hChildItem, 0);
hChildItem = hNextItem;
code works good . but here is i think small problem . i cant find it.
when i click the root node it goes to checked state but not child node. again i click same root node it goes to unchecked state but all child's are goes to checked state.
help me. here what is the problem?

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