关于 树控件 Tree-View Control 的使用

Question

需要一个示例代码  ，不使用 mfc 的类，只使用 Tree-View Control  提供的消息或宏以及 api 来 操作 Tree-View Control 。需求 ： 插入两个结点 ， 比如命名为 item_00 , item_00_1 ,  item_00 是 item_00_1 的父结点 。运行后，我们应当看到 item_00 旁边有个小加号以及单击加号后显示出 子结点  item_00_1 。需求完毕。我想要示例代码，是因为我插入父子结点后，看不到什么加号 ，窗口风格我也指定了 TVS_HASBUTTONS TVS_HASLINES  。所以拜托朋友给出示例代码。                                  谢谢！！

Answer 1

代码来了：
   HWND   hwndTreeView =  CreateWindowEx( 0 , // 新加的扩展风格  WS_EX_CLIENTEDGE
   WC_TREEVIEW ,  // 窗口类
   NULL, // 窗口名称，可以显示在标题栏 或者 按钮上
   WS_VISIBLE | WS_CHILD | WS_BORDER | TVS_HASLINES | TVS_LINESATROOT ,  // |LBS_EXTENDEDSEL|LBS_MULTIPLESEL|WS_VSCROLL|WS_HSCROLL|LBS_NOTIFY  , // 窗口风格    0  ,   80 ,  // 左上角坐标
   
   300 , 
   200 , // 宽 和 高
   
   this->GetSafeHwnd() , // 父窗口 
   (HMENU)1000,  // 菜单或者子窗口id
   0, //进程实例，xp下被忽略
   NULL //自定义的参数
   );         // 先插入一个作为 root ，后面的循环中插入子结点 TVITEMEX tcie00;     tcie00.mask = TVIF_TEXT ; // | TVIF_CHILDREN  ;     tcie00.pszText = "root001";        tcie00.cChildren = 1; // I_CHILDRENCALLBACK ;     //tcie00.iImage = 0;
    TVINSERTSTRUCT  item_000;      item_000.hParent = TVI_ROOT ; // 根节点     item_000.hInsertAfter = TVI_ROOT ;     item_000.itemex = tcie00;
HTREEITEM   hti_root =  TreeView_InsertItem( hwndTreeView , &item_000 ); // 返回值是新item句柄 for( int i = 0; i < 10 ;i ++ )
{
TVITEMEX tcie00;     tcie00.mask = TVIF_TEXT ; // | TVIF_CHILDREN  ;     tcie00.pszText = "root001";        tcie00.cChildren = 1; // I_CHILDRENCALLBACK ;     //tcie00.iImage = 0;
    TVINSERTSTRUCT  item_000;      item_000.hParent = hti_root ; // 根节点     item_000.hInsertAfter = TVI_ROOT ;     item_000.itemex = tcie00;
HTREEITEM   hti00 =  TreeView_InsertItem( hwndTreeView , &item_000 ); // 返回值是新item句柄
}

Answer 2

HWND CreateTreeView(HINSTANCE hInstance, HWND hwndParent)
{
DWORD       dwStyle;
HWND        hwndTreeView;
BOOL        bSuccess = TRUE;dwStyle =   WS_TABSTOP | WS_CHILD | WS_BORDER | WS_VISIBLE ;//
            
hwndTreeView = CreateWindowEx(   WS_EX_WINDOWEDGE,//WS_EX_CLIENTEDGE,// ex style
                                 WC_TREEVIEW, // class name defined in commctrl.h
                                 NULL,                      // window text
                                 dwStyle,                   // style
                                 320,                       // x position
                                 120,                       // y position
                                 TV_WIDTH,                  // width
                                 TV_HEIGHT,                 // height
                                 hwndParent,                // parent
                                 (HMENU)IDC_TREEVIEW,       // ID
                                 (HINSTANCE)GetWindowLong(hwndParent, GWL_HINSTANCE), // instance
                                 NULL);                     // no extra data
//
if(hwndTreeView)
{
InitTreeView(hwndTreeView);
return hwndTreeView;
}
else
{
return NULL;
}
}
//
BOOL InitTreeView(HWND hwndTreeView)
{
// set tree style
LONG NewStyle=GetWindowLong(hwndTreeView,GWL_STYLE);
NewStyle=NewStyle|TVS_HASBUTTONS|TVS_HASLINES|TVS_INFOTIP|
             TVS_LINESATROOT|TVS_SHOWSELALWAYS|TVS_EDITLABELS;
SetWindowLong(hwndTreeView,GWL_STYLE,NewStyle);
//
    HIMAGELIST  hImageList;
    SHFILEINFO  sfi;
    hImageList = (HIMAGELIST)SHGetFileInfo((LPCSTR)"C:\\",0,&sfi,sizeof(SHFILEINFO), 
                                           SHGFI_SYSICONINDEX | SHGFI_SMALLICON);
    if (hImageList)
{// Attach ImageList to TreeView
TreeView_SetImageList(hwndTreeView,hImageList,TVSIL_NORMAL);
}// draw tree "My Computer"
TV_INSERTSTRUCT TreeCtrlItem;
TreeCtrlItem.hParent = TVI_ROOT;
TreeCtrlItem.hInsertAfter = TVI_LAST;// don't use TVI_SORT;
TreeCtrlItem.item.mask = TVIF_TEXT|TVIF_IMAGE|TVIF_SELECTEDIMAGE|TVIF_CHILDREN;//|TVIF_STATE;
TreeCtrlItem.item.pszText= m_MyComputer;//
TreeCtrlItem.item.cchTextMax = MAX_PATH;
TreeCtrlItem.item.cChildren=1;// has child show "+"
//
    HRESULT hr;
LPMALLOC lpMalloc;
    hr=::SHGetMalloc(&lpMalloc);
    if (FAILED(hr)) return TRUE;
// get pidl of "My Computer"
    LPITEMIDLIST  lpidl=NULL;  // pidl of "My Computer"
hr=SHGetSpecialFolderLocation(NULL,CSIDL_DRIVES,&lpidl);
    if (FAILED(hr)) return TRUE;
// icons and "My Computer"
SHGetFileInfo((LPCSTR)lpidl,0,&sfi,sizeof(SHFILEINFO), SHGFI_PIDL | 
SHGFI_DISPLAYNAME | SHGFI_SYSICONINDEX | SHGFI_SMALLICON);
TreeCtrlItem.item.iImage = sfi.iIcon;
strcpy(m_MyComputer,sfi.szDisplayName);
//
SHGetFileInfo((LPCSTR)lpidl,0,&sfi,sizeof(SHFILEINFO),SHGFI_PIDL | 
SHGFI_SYSICONINDEX | SHGFI_SMALLICON | SHGFI_OPENICON);
TreeCtrlItem.item.iSelectedImage = sfi.iIcon;
// insert root
HTREEITEM hTreeItem1 = TreeView_InsertItem(hwndTreeView,&TreeCtrlItem);
TreeCtrlItem.hParent = hTreeItem1;
// Free
lpMalloc->Free(lpidl);
lpMalloc->Release();
// under "My Computer"
char buf[MAX_PATH];
char *pDrv=buf;
char drive[40];
if(GetLogicalDriveStrings(260,buf))
{// try all drive
while(*pDrv)
{
strcpy(drive,pDrv);
pDrv+=strlen(drive)+1;
// no A:
if(stricmp(drive,"A:\\")==0) continue;
SHGetFileInfo(drive,FILE_ATTRIBUTE_DIRECTORY,&sfi,sizeof(sfi),
     SHGFI_DISPLAYNAME | SHGFI_USEFILEATTRIBUTES | SHGFI_TYPENAME | SHGFI_SYSICONINDEX | SHGFI_SMALLICON);
TreeCtrlItem.hParent = hTreeItem1;
TreeCtrlItem.item.pszText = sfi.szDisplayName;
TreeCtrlItem.item.iImage=sfi.iIcon;
TreeCtrlItem.item.iSelectedImage = sfi.iIcon;
TreeCtrlItem.item.cChildren=1;// child show "+"
// add in
HTREEITEM hTreeItem2 = TreeView_InsertItem(hwndTreeView,&TreeCtrlItem);
// TreeCtrlItem.hParent = hTreeItem2;
}
}
// expand "My Computer"
// TreeView_SelectItem(hwndTreeView,hTreeItem1);//m_Tree.SelectItem();// root
TreeView_Expand(hwndTreeView,hTreeItem1,TVE_EXPAND);// root return TRUE;
}

Answer 3

case WM_CREATE:
{
HWND hTreeView = CreateWindow(WC_TREEVIEW, _T(""), 
WS_CHILD | WS_BORDER | WS_VISIBLE | TVS_FULLROWSELECT | TVS_HASLINES | TVS_LINESATROOT | TVS_HASBUTTONS | TVS_SHOWSELALWAYS,
10, 10, 200, 300, hWnd, (HMENU)0x11, hInst, NULL);
if(hTreeView)
{
TVINSERTSTRUCT ti;
ti.hParent = NULL;
ti.hInsertAfter = TVI_LAST;
ti.item.mask = TVIF_TEXT;
TCHAR buf[32] = {0};
_stprintf(buf, _T("%s"), _T("item_0"));
ti.item.cchTextMax = _tcslen(buf);
ti.item.pszText = buf;
HTREEITEM hItem = TreeView_InsertItem(hTreeView, &ti);
ti.hParent = hItem;
_stprintf(buf, _T("%s"), _T("item_0_1"));
ti.item.cchTextMax = _tcslen(buf);
ti.item.pszText = buf;
TreeView_InsertItem(hTreeView, &ti);
}
}
break;