?今天簡單的學了下CTreeCtrl，新建一個基于單文檔的MFC工程，在resource的IDD_DIALOG1里添加一個tree control，將其styles勾上has buttons，has lines，lines at root，通過classWizard添加一個繼承于CDialog的類CExDialog，添加私有成員變量CImageList m_imageList，然后就在OnInitDialog()函數里添加樹控件的細節：

BOOL CExDialog::OnInitDialog()
{
??? CDialog::OnInitDialog();
??? HICON hlcon[8];
???
??? m_imageList.Create( 16, 16, 0, 8, 8 );

??? hlcon[0] = AfxGetApp()->LoadIcon( IDI_ICON1 );
??? hlcon[1] = AfxGetApp()->LoadIcon( IDI_ICON2 );
??? hlcon[2] = AfxGetApp()->LoadIcon( IDI_ICON3 );
??? hlcon[3] = AfxGetApp()->LoadIcon( IDI_ICON4 );
??? hlcon[4] = AfxGetApp()->LoadIcon( IDI_ICON5 );
??? hlcon[5] = AfxGetApp()->LoadIcon( IDI_ICON6 );
??? hlcon[6] = AfxGetApp()->LoadIcon( IDI_ICON7 );
??? hlcon[7] = AfxGetApp()->LoadIcon( IDI_ICON8 );

??? for ( int n =0; n <8; n ++ )
??? {
??????? m_imageList.Add( hlcon[n] );
??? }

??? CTreeCtrl* pTree = (CTreeCtrl*)GetDlgItem( IDC_TREEVIEW1 );
??? pTree->SetImageList( &m_imageList, TVSIL_NORMAL );
??? TV_INSERTSTRUCT tvinsert;
??? tvinsert.hParent = NULL;
??? tvinsert.hInsertAfter = TVI_LAST;
??? tvinsert.item.mask = TVIF_IMAGE | TVIF_SELECTEDIMAGE | TVIF_TEXT;
??? tvinsert.item.hItem = NULL;
??? tvinsert.item.state =0;
??? tvinsert.item.stateMask =0;
??? tvinsert.item.cchTextMax =6;
??? tvinsert.item.iSelectedImage =1;
??? tvinsert.item.cChildren =0;
??? tvinsert.item.lParam =0;
??? tvinsert.item.iImage =0;

/**///
??? tvinsert.item.pszText ="HOMER";
??? HTREEITEM hDad = pTree->InsertItem( &tvinsert );

/**///
??? tvinsert.item.pszText ="Marge";
??? HTREEITEM hMom = pTree->InsertItem( &tvinsert );

??? tvinsert.hParent = hDad;
??? tvinsert.item.pszText ="Bart";
??? tvinsert.item.iImage =3;
??? pTree->InsertItem( &tvinsert );

??? tvinsert.hParent = hMom;
??? tvinsert.item.pszText ="Lisa";
??? tvinsert.item.iImage =6;
??? pTree->InsertItem( &tvinsert );
???
??? tvinsert.item.pszText ="Dilbart";
??? HTREEITEM hOther = pTree->InsertItem( &tvinsert );

??? tvinsert.hParent = hOther;
??? tvinsert.item.pszText ="Dogbert";
??? tvinsert.item.iImage =7;
??? pTree->InsertItem( &tvinsert );

??? tvinsert.item.pszText ="Ratbert";
??? pTree->InsertItem( &tvinsert );
???????
??? return TRUE;? // return TRUE unless you set the focus to a control
????????????????? // EXCEPTION: OCX Property Pages should return FALSE
}

這樣就建立了兩個父節點，HOMER和Marge，tvinsert.item.iSelectedImage
設置了當選中這項時顯示什么圖標，tvinsert.item.iImage設置了當沒有選中時顯示的圖標，tvinsert.item.pszText設置顯示出來的文本。如果沒有對tvinsert.hParent進行更改設置，那么新添加的節點和上一個節點的父節點為同一節點。
下面這段代碼實現了選中某一項進行的更改操作：

void CExDialog::OnSelchangedTreeview1(NMHDR* pNMHDR, LRESULT* pResult)
{
??? NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
???
??? CTreeCtrl* pTree = (CTreeCtrl*)GetDlgItem(IDC_TREEVIEW1);
??? HTREEITEM hSelected = pNMTreeView->itemNew.hItem;
??? if ( hSelected != NULL )
??? {
??????? char text[31];
??????? TV_ITEM item;
??????? item.mask = TVIF_HANDLE | TVIF_TEXT;
??????? item.hItem = hSelected;
??????? item.pszText = text;
??????? item.cchTextMax =30;
??????? VERIFY( pTree->GetItem(&item) );
??????? SetDlgItemText( IDC_TREEVIEW1, text );
??? }

??? *pResult =0;
}

有了這些代碼還是不夠的，如果想顯示的話，我們要把這個頭文件加入到TreeTestView.cpp里，添加OnLButtonDown事件，并添加一段代碼：

CExDialog dlg; ??? dlg.DoModal();

?????? ok，這樣編譯運行下，點擊鼠標左鍵，就會出現一個樹狀控件，呵呵，簡單吧。。。 這些只是實現了靜態添加樹節點。以后還要深入的學習！

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轉載于:https://www.cnblogs.com/toconnection/archive/2012/08/08/CTreeCtrl.html

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