treectrl单击项始终为null [英] treectrl click item always null

问题描述

我有这段代码

I have this piece of code

ON_NOTIFY(NM_CLICK ,ID_TREENOTES, OnClickTree)

void CShortcutPaneConfServer::OnClickTree(NMHDR* pNMHDR, LRESULT* pResult ) {
	CPoint pt;
     GetCursorPos( &pt );
     m_wndTreeNotes.ScreenToClient( &pt ) ;
	
	UINT nFlags = 0;
     HTREEITEM hItem = m_wndTreeNotes.HitTest( pt, &nFlags ) ;
     if( hItem == NULL  ||  !(nFlags & (TVHT_ONITEMLABEL|TVHT_ONITEMICON)) )
		return;

不幸的是，即使我单击某个项目，hItem始终为NULL.缺少什么?

PS:我是在mdichildframe中，它可能会以某种方式影响光标的坐标，请参见screentoclient?

Unfortunately hItem is always NULL, even if I click on an Item... what''s missing?

PS: Im in a mdichildframe, it could affect in some way cursor coordinates see screentoclient?

推荐答案

我认为您错过了Mouse进入TreeCtrl的位置，请尝试如下操作:

I think that you missed The Mouse location into your TreeCtrl, try as below :

void CShortcutPaneConfServer::OnClickTree(NMHDR* pNMHDR, LRESULT* pResult ) {
// TODO: Add your control notification handler code here
*pResult = 0;

    CPoint Point;
    //retrieve the mouse position (missed in yout code)
         DWORD dwPos;
         dwPos = GetMessagePos(); 
         Point.x = LOWORD (dwPos);
         Point.y = HIWORD (dwPos); 


m_wndTreeNotes.ScreenToClient( &Point );
 UINT Flags = TVHT_ONITEMLABEL;
HTREEITEM ht = m_wndTreeNotes.HitTest( Point ,&Flags );
if( ht== NULL  ||  !(Flags & (TVHT_ONITEMLABEL|TVHT_ONITEMICON)) )
return;

}

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