Question

VC++中怎样在指定的TreeCtrl节点中添加子节点？

比如有下面结构的TreeCtrl:|+----水果+----五谷想在水果节点下添加“香蕉”子节点，在VC++中怎样编程？

Answer 1

CTreeCtrl* pCtrl = (CTreeCtrl*) GetDlgItem(IDC_TREE1);
ASSERT(pCtrl != NULL);

// Insert a root item using the structure. We must
// initialize a TVINSERTSTRUCT structure and pass its
// address to the call.

TVINSERTSTRUCT tvInsert; // 这是定义了一个父节点
tvInsert.hParent = NULL;
tvInsert.hInsertAfter = NULL;
tvInsert.item.mask = TVIF_TEXT;
tvInsert.item.pszText = _T("United States");

HTREEITEM hCountry = pCtrl->InsertItem(&tvInsert); // 插入父节点，记住前面这个hCountry 下面又把它作为了父节点

HTREEITEM hPA = pCtrl->InsertItem(TVIF_TEXT,
_T("Pennsylvania"), 0, 0, 0, 0, 0, hCountry, NULL); //这里插入一个hCountry 的子节点

HTREEITEM hWA = pCtrl->InsertItem(_T("Washington"), // 这里又插入一个hCountry 的子节点并且放在hPA的后面（是同一个辈分的）
0, 0, hCountry, hPA);

pCtrl->InsertItem(_T("Pittsburgh"), hPA, TVI_SORT); // 这里连续插入了三个hPA的子节点
pCtrl->InsertItem(_T("Harrisburg"), hPA, TVI_SORT);
pCtrl->InsertItem(_T("Altoona"), hPA, TVI_SORT);

pCtrl->InsertItem(_T("Seattle"), hWA, TVI_SORT); //这里插入了3个hWA的子节点
pCtrl->InsertItem(_T("Kalaloch"), hWA, TVI_SORT);
pCtrl->InsertItem(_T("Yakima"), hWA, TVI_SORT); 根据上面的方法，你可以插入自己的节点了下面给你函数原型看看 HTREEITEM InsertItem( LPTVINSERTSTRUCT lpInsertStruct );HTREEITEM InsertItem( UINT nMask, LPCTSTR lpszItem, int nImage, int nSelectedImage, UINT nState, UINT nStateMask, LPARAM lParam, HTREEITEM hParent, HTREEITEM hInsertAfter );HTREEITEM InsertItem( LPCTSTR lpszItem, HTREEITEM hParent = TVI_ROOT, HTREEITEM hInsertAfter = TVI_LAST );HTREEITEM InsertItem( LPCTSTR lpszItem, int nImage, int nSelectedImage, HTREEITEM hParent = TVI_ROOT, HTREEITEM hInsertAfter = TVI_LAST);

Answer 2

HTREEITEM InsertItem( LPCTSTR lpszItem,
HTREEITEM hParent = TVI_ROOT,
HTREEITEM hInsertAfter = TVI_LAST );
HTREEITEM InsertItem( LPCTSTR lpszItem,
int nImage,
int nSelectedImage,
HTREEITEM hParent = TVI_ROOT,
HTREEITEM hInsertAfter = TVI_LAST);
这两个函数都可以使用。区别是一个有图标一个没图标
最后一个参数可以不使用。
主要是hParent 要填对就OK了。

这是我用过的一个初始化函数，供参考
void CTree::OnInitialUpdate()
{

CTreeView::OnInitialUpdate();
m_pTree = &GetTreeCtrl();
m_pTree->ModifyStyle(0, TVS_HASLINES | TVS_LINESATROOT | TVS_HASBUTTONS);
m_pImageList = new CImageList(); // 树子节点的图标

CWinApp* pApp=AfxGetApp();
m_pImageList->Create(32,32,ILC_COLOR8|ILC_MASK,3,3);
m_pImageList->Add(pApp->LoadIcon(IDI_ComputerOff));
m_pImageList->Add(pApp->LoadIcon(IDI_ComputerOn));
m_pImageList->Add(pApp->LoadIcon(IDI_Video));
m_pTree->SetImageList(m_pImageList, TVSIL_NORMAL);

m_hRoot = m_pTree->InsertItem(_T("IPTV"),0,0);
m_pTree->SetItemImage(m_hRoot,1,0);
m_hCh1=m_pTree->InsertItem(_T("Channel1"),0,0,m_hRoot);
m_pTree->SetItemImage(m_hCh1,2,2);
m_hCh2=m_pTree->InsertItem(_T("Channel2"),0,0,m_hRoot);
m_pTree->SetItemImage(m_hCh2,2,2);
m_hCh3=m_pTree->InsertItem(_T("Channel3"),0,0,m_hRoot);
m_pTree->SetItemImage(m_hCh3,2,2);

}