Implementation of Dynamic menus in WTL

During code writing, the program needs to read the secondary node under the root node of CTreeViewCtrl and generate the child menu to add it to the right-click menu of the leaf list. The actual operation is as follows:
1) Delete the original menu
This step is very important, because dynamically generated menus will not be deleted as long as they are added.
// Delete the original menu first
CMenuHandle menu = pMenu-> GetSubMenu (0). GetSubMenu (MY_MOVE_FRIENT_MENU_POS); // MY_MOVE_FRIENT_MENU_POS is defined at the beginning of the program, right-click the position of the Level 2 menu
For (int I = menu. GetMenuItemCount (); I> 0; I --)
{
Menu. RemoveMenu (I, MF_BYPOSITION );
}
2) Secondary node for reading CTreeView

// Read the root node of CTreeViewCtrl first
HTREEITEM hRoot = m_wndLocalList.GetRootItem (); // read the first child node of CTreeViewCtrl, that is, the first child node
HTREEITEM hFirst = m_wndLocalList.GetChildItem (hRoot );

3) insert it to the sub-menu

While (hFirst! = NULL)
{
If (strFirst. Compare (strItemSelParent )! = 0)
{// Judgment statement, which does not insert the parent vertex of the subnode
Menu. InsertMenu (-1, MF_BYPOSITION | MF_STRING, (UINT) ID_MENU_ADD_FRIEND_TO_GROUP + (* piMenuID), strFirst );
* PiMenuID = * piMenuID + 1;
}
// After you perform the Insert menu operation or skip the insert operation, you need to obtain the next Node object hFirst = m_wndLocalList.GetNextItem (hFirst, TVGN_NEXT );
M_wndLocalList.GetItemText (hFirst, strFirst );}

4) In BEGIN_MSG_MAP () and END_MSG_MAP, add

COMMAND_RANGE_HANDLER (ID_MENU_ADD_FRIEND_TO_GROUP, ID_MENU_ADD_FRIEND_TO_GROUP + 100, OnMenuAddToFriendGroupRange) COMMAND_RANGE_HANDLERTo set the menu ID range. As long as your dynamic menu ID is in this range, ID_MENU_ADD_FRIEND_TO_GROUP is defined as a const int number and resource. h.

The program uses OnMenuAddToFriendGroupRange (WORD, WORD pos, HWND, BOOL &) to respond to the menu.
// Obtain the selected item HTREEITEM hItemSel = m_wndLocalList.GetSelectedItem ();
// Delete
M_wndLocalList.DeleteItem (hItemSel); // Insert a new project. hGroupItem can be obtained only by traversing and comparing it.
HTREEITEM hNewItem = m_wndLocalList.InsertItem (strSelectedText, hGroupItem, TVI_SORT); // information sent to the server last time
Add_to_group ();