TreeCtrl LPARAM 이용하기

1. TreeCtrl 구성

TV_INSERTSTRUCT tvstruct;
 HTREEITEM item, item2;
 tvstruct.hParent = NULL;
 tvstruct.hInsertAfter = TVI_LAST;
 tvstruct.item.mask = TVIF_TEXT | TVIF_PARAM;
 tvstruct.item.pszText = "코스피";
 tvstruct.item.lParam = (LPARAM)"KOSPI";
 item = m_treeCtrl.InsertItem(&tvstruct);

 tvstruct.item.pszText = "코스닥";
 tvstruct.item.lParam = (LPARAM) "KOSDAQ";
 item2 = m_treeCtrl.InsertItem(&tvstruct);

 tvstruct.hParent = item;
 tvstruct.item.pszText = "동양약품";
 tvstruct.item.lParam = (LPARAM)"000020";
 m_treeCtrl.InsertItem(&tvstruct);

2. LPARAM 얻기

NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
 // TODO: Add your control notification handler code here

 char* str = (char*)m_treeCtrl.GetItemData(pNMTreeView->itemNew.hItem);

또는
char* str1 = (char*)pNMTreeView->itemNew.lParam;

SetItemData(), GetItemData() 사용하면 형변환이 필요없다고 언급되어 있음.