Re: CListCtrl FindItem LVFI_PARAM

From:

"Tom Serface" <tom@nospam.camaswood.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Mon, 9 Mar 2009 07:07:06 -0700

Message-ID:

<8B9EF27D-A10A-410E-A220-5550A895A801@microsoft.com>

I ended up doing that in one of my programs where I needed the data from a
different column (subitem) and I couldn't get FindItem to work. Then I
noticed that the speed of doing the loop was not that bad even for my test
with 10K items in the list. I mostly use virtual list controls these days
so I typically just look through my own memory for what I want now then use
something like EnsureVisible() to pop it onto the screen (in a virtual list
control only the items on the screen are actually in the list so this
approach ulitmately works better for me.

Tom

"rockdale" <rockdale.green@gmail.com> wrote in message
news:d075657b-f74a-4b5b-94e6-b5d9cc8f6d76@j8g2000yql.googlegroups.com...
That's what I did for now. Just wondering if I use the FindItem wrong.
Probably something about the derived class.

Thanks anyway.

On Mar 5, 5:01 pm, "Tom Serface" <t...@nospam.camaswood.com> wrote:

Oops, sorry, I meant to say:

m_myList.SetItemText(nRow,0, sName.c_str());
m_myList.SetItemData(nRow, nID);

If that still doesn't work, there must be something else going on. You
could try reading the value back in a loop using GetItemData() and find
the
row that way rather than using FindItem. I think that is pretty much what
FindItem is doing anyway.

Tom

"rockdale" <rockdale.gr...@gmail.com> wrote in message

news:96a9b838-146f-475c-a486-d678b13a0ba8@f33g2000vbf.googlegroups.com...
I tried that by replace

m_myList.SetItemText(item.iItem, item.iSubItem, sName.c_str());
m_myList.SetItemData(item.iItem, nID);

with
m_myList.SetItem(&item);

It does not work.

setItemText and SetItemData is because m_myList is actually derived
from CListCtrl with more functionalities (like change back color and
text color).

But for this FindItem particular case, m_myList is CListCtrl. I tried
to erase the derived class effect.

thanks again

On Mar 5, 1:11 pm, "Tom Serface" <t...@nospam.camaswood.com> wrote:

Have you tried just modifying the data without doing the set new item
object? I don't think you need to make it that complex.

m_myList.SetItemText(item.iItem, item.iSubItem, sName.c_str());
m_myList.SetItemData(item.iItem, nID);

Tom

"rockdale" <rockdale.gr...@gmail.com> wrote in message

news:fc9096f4-1104-4456-b89c-e9b49830d368@c11g2000yqj.googlegroups.com...

I have a CCtrlList with 2 columns.

My data contains ID NAME and ADDRESS, NAME is the column 0 and ADDRESS
is column 1. ID I put it in the lParam. When I try to finditem based
on the ID, I always get -1 back. Anybody can help? The CListCtrl is
not sortable.

Please see the following code, notice the ???? comment:

m_myList is a CListCtrl

Insert ITEM function

int iRow = 0;
LVITEM item;
iRow = m_lstSelectedUnits.GetItemCount();
item.mask = LVIF_TEXT| LVIF_PARAM;
item.iSubItem = 0;
item.iItem = iRow;
m_myList.InsertItem(&item);

Update ITEM function
LVITEM item;
item.iItem = nRow;

item.mask = LVIF_TEXT| LVIF_PARAM;
item.iSubItem = 0;
item.pszText = (LPSTR)sName.c_str();
item.lParam = (LPARAM)nID;
m_myList.SetItemText(item.iItem, item.iSubItem, item.pszText);
m_myList.SetItemData(item.iItem, item.lParam);

item.mask = LVIF_TEXT;
item.iSubItem = 1;
item.pszText = (LPSTR)sAddr.c_str();
m_myList.SetItemText(item.iItem, item.iSubItem, item.pszText);

find ITEM function

if(m_myList.GetItemCount()==0) return -1;

LVFINDINFO toFind;
toFind.flags = LVFI_PARAM;
toFind.lParam = nTransmitPointID;
int nRow = m_myList.FindItem(&toFind, -1);
//???? nRow ALWAYS RETURN -1

LVITEM item;
for(int i=0; i< m_myList.GetItemCount(); i++)
{
int id = (int)m_myList.GetItemData(i);
//THIS WORKS and GETS THE ID

item.iItem = i;
item.iSubItem = 0;
item.mask = LVIF_PARAM ;
m_myList.GetItem(&item);
//?????THE item.lParam is not the lParam set in the
update function.
}

------------
thanks in advance
-rockdale

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