How come in my CTreeCtrl SetCheck doesn't work?

When I am populating my CTreectrl with nodes (which is done from the MyCFormView::OnInitialUpdate()) - right after I do InsertItem - I then do SetCheck - yet this doesn't show the item checked when the application goes up. Note that right after a SetCheck I do a GetCheck to see that it was checked and it shows that it is. Does anyone know why??


HTREEITEM moduleItem=m_TreeCtrl->InsertItem(&insertStr);
m_TreeCtrl->SetCheck(moduleItem,TRUE );

hmm...
m_TreeCtrl.SetCheck(hItem,TRUE);

that should work. how do you set your checkboxes for your treectrl?
did you draw your own?

if so try it

Code:

---

m_TreeCtrl.SetItemState(
hItem// item
,INDEXTOSTATEIMAGEMASK(UNCHECK),//UNCHECK here is 1, the image index. 2 for check, hey that's depend on your BMP image
TVIS_STATEIMAGEMASK // saying you want to change state image to treectrl, there is another image, normal image, you dont' want to change that.
);

---

good luck

Hi,

Please try this link

http://www.codeguru.com/forum/showt...eeCtrl+SetCheck

With Regards
Prakash

Quote:

---

Originally posted by pgnanaprakash
Hi,

Please try this link

http://www.codeguru.com/forum/showt...eeCtrl+SetCheck

With Regards
Prakash

---

What's the point in bringing up all those old posts with the same question and giving a reference to the same thread (with a link which doesn't work, BTW) five times in a row?

Does anybody know a solution for the above problem. The frustrating part is that in some cases the checkboxes are actually checked but most of time not. And I do exactly the same (I made a function to check all the tree items). Is this a bug, or is there just something I forgot.

I am currently having the same problem.

I'm setting them to true in the OnInitDialog() of my PropertyPage.
If I call GetCheck() immediately after, I get the correct result, but the checks are not drawn.

I'm simply using the TVS_CHECKBOXES style, and SetCheck(). No funny business. I've done it a gazillion times before without hickups...

Most curious.

I'm running XP, Visual Studio 6.

really... i never have any problem..
did you forget to update the dialog?
sometime i dont' forget to call UpdateData() and wondering why all those data didn't get change eventhough I code were right.
So check if you have called UpdataData() first.

I must admit that I never used updateData(), but somehow all my tree items get added just fine. The only problem is the getCheck() operation. I tried adding updateData() but unfortunately that does not work either. In the OnInitDialog() function from my dialog that contains my tree I call the following (simplified) function:

Code:

---

void CGroups::updateTree(CMyTreeCtrl *a_tree)
{
        a_tree->DeleteAllItems();

        std::map<int,CGroup>::iterator g_pos = this->m_groups.begin();
        while (g_pos != this->m_groups.end())
        {
                HTREEITEM hGroup = a_tree->InsertItem(g_pos->second.text);
                a_tree->SetCheck(hGroup,g_pos->second.visible);
                g_pos++;
        }
       
        a_tree->UpdateData();
}

---

The real function is somewhat more complex with more loops for deeper levels of the tree but I use the same method for setting the checkbox. I also have a function that manually updates all the checkboxes from an administration, and the funny thing is that it only works when I call that function from the tree function OnNMClick. I tried calling that same function from different places but then it does not work.

Mza,

Have you figured this out yet? I'm doing almost exactly what you're doing, and am having the same issue.

I've tried UpdateData(TRUE/FALSE), RedrawWindow(), Invalidate(), etc. etc. still no luck.

I've since moved on to other tasks and figured I'd come back to this.

Have you had any luck in the past few days?

Regards,

Morgan

Ok, I've figured out how to get this to work.

In my OnInitDialog(), just before calling my routine that populates and checks the tree ctrl, I added:

Code:

---

//remove and add the checkbox style.
m_ctrlTree.ModifyStyle( TVS_CHECKBOXES, 0 );
m_ctrlTree.ModifyStyle( 0, TVS_CHECKBOXES );

---

That did it for me. Apparantly it's not enough to have the style specified in your resource file.

Hope this helps others who are frustrated by this

He thanks KeyserSoze , your solution works great. Finally my tree does exactly what I want.

The most strange problem is solved with the most strange solution.

Thanks, it works great for me