Question

CTreeCtrl in MFC @nd Qyestion

Asked by: LarryMillsSr

How do you SetItemData in a CTreeCtrl
My Code:
strItems[0]= _T("Reports");
strItems[1]= _T("Construction");
strItems[2]= _T("Materials");

      HTREEITEM hReportsItemRoot= m_cTree.InsertItem(strItems[0]);
      HTREEITEM hConstItemRoot= m_cTree.InsertItem(strItems[1], hReportsItemRoot);
      HTREEITEM hMaterialsItemRoot= m_cTree.InsertItem(strItems[2],hConstItemRoot);

There's more, but you can see my strategy above.  At what point do I use this "When you populate the tree, you assign a special value into the "item data" (SetItemData). ":
(I thought SetItemData was used to populate the control itself.)
Please be patient with me and show me how to do this, also do I use a series of If ... else if .. else statement to compare the return in NM+Click or SelChanged ? an example would be nice
{lease demonstrate with complete code as to what goes in theSELCHANGED and SELCHANGING functions.(Please use my varables above in your explaination.

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Asked On
2009-10-29 at 05:44:38ID24854352
Tags

CTreeCtrl 2

Topic

Windows MFC Programming

Participating Experts
1
Points
250
Comments
5

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Answers

 

by: ZoppoPosted on 2009-10-29 at 06:06:25ID: 25693149

Hi LarryMillsSr,

with SetItemData you can assign a numerical value (which even can be a pointer) to an item in a tree. Just pass the handle to the item and the data, i.e.:

> HTREEITEM hConstItemRoot= m_cTree.InsertItem(strItems[1], hReportsItemRoot);
> m_cTree.SetItemData( hConstItemRoot, 1 );

To retrieve it later on do
> int n = m_cTree.GetItemData( hConstItemRoot );
> CString strText = strItems[ n ];

Hope that helps,

ZOPPO

 

by: ZoppoPosted on 2009-10-29 at 06:09:39ID: 25693183

Sorry, I forgot the selchange-sample ...

void CMyDialog::OnSelchangedTree(NMHDR* pNMHDR, LRESULT* pResult)
{
 NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
 
 int n = m_cTree.GetItemData(pNMTreeView->itemNew.hItem);
 
 CString strText = strItems[ n ];
 
 // continue ...
}

                                              
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by: LarryMillsSrPosted on 2009-10-29 at 07:23:57ID: 25694000

This control is in a dialog and is a CTreeCtrh not a VTreeView. does everything work the same between both control versions?

 

by: ZoppoPosted on 2009-10-29 at 08:17:59ID: 25694633

This works for dialogs too - don't worry about those names like NM_TREEVIEW, it works for CTreeCtrl with any kind of parent, no matter if CDialog or CTreeView or something else ...

 

by: LarryMillsSrPosted on 2009-10-29 at 10:55:21ID: 31647470

Thanks

20120131-EE-VQP-002

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