VC + + CTreeCtrl use Nm_click and tvn_selchanged

This is the handler function Nm_click when the CTreeCtrl control is clicked

voidCdriverselctrl::onnmclick (NMHDR *pnmhdr, LRESULT *PResult)    {CPoint curpoint;    UINT nflags;    Htreeitem HItem; GetCursorPos (&curpoint);//Current Point coordinatesScreenToClient (&curpoint);//screen coordinates converted to tree inner coordinatesHItem = HitTest (Curpoint, &nflags);//whether the coordinates have an item    if(HItem && (Tvht_onitem & nflags))//Judging whether there is Htreeitem    {         This-SelectItem (HItem);//Click here to process the results after clicking}
   //TODO: Add control notification handler code here*presult =0;}

It is important to point out here that the HitTest function can detect not only where the item is located on item, but also the description of MSDN.

Value	meaning
Tvht_above	Above the client area.
Tvht_below	Below the client area.
Tvht_nowhere	In the client area, but below the last item.
Tvht_onitem	The bitmap or label associated with an item.
Tvht_onitembutton	The button associated with an item.
Tvht_onitemicon	The bitmap associated with an item.
Tvht_onitemindent	In the indentation associated with an item.
Tvht_onitemlabel	The label (string) associated with an item.
Tvht_onitemright	The area to the right of a item.
Tvht_onitemstateicon	On the State, icon for a Tree-view item, is in a user-defined state.
Tvht_toleft	The left of the client area.
Tvht_toright	The right of the client area.

This allows for more flexible use of the Ctreectl control.

For example, the following example:

voidCdriverselctrl::onnmclick (NMHDR *pnmhdr, LRESULT *PResult)    {CPoint point;    UINT Uflag;    BOOL bcheck; GetCursorPos (&Point ); Ctreectrl::screentoclient (&Point ); Htreeitem Htree= Ctreectrl::hittest (Point, &uflag);if(Htree && (tvht_onitemstateicon &Uflag))        {Ctreectrl::selectitem (htree); Bcheck=Ctreectrl::getcheck (Htree);     }    //TODO: Add control notification handler code here*presult =0;}

Here is the function when the option changes

// This is the handler function when the control's selection has changed void Cdriverselctrl::ontvnselchanged (NMHDR *pnmhdr, LRESULT *pResult) {    = Reinterpret_cast<lpnmtreeview >(PNMHDR);p nmtreeview// check htreeitem// last selected Htreeitem// TODO:  Add control notification handler code 0 here ;}

VC + + CTreeCtrl use Nm_click and tvn_selchanged