Re: Call back function for a list control

31 May 2006 10:56:27 -0700
Hi Tom,

Thanks for the response.The link is more informative and I did
understand some concepts.

Do we specifically declare a callback function after adding a handler
to in the LVITEM Structure?

But nowhere we are specifying the callback function

Its the ON_NOTIFY message ,Right ?Is this the call back function ?Pls

Pls go through my steps of writing a callback function

The structure would be like this .......

Step1 :This I will did in OnIniatialUpdate of CFromView

LVITEM* NewItem = new LVITEM;
NewItem->lParam = (LPARAM) pLogItem; // Store the pointer to the data
NewItem->pszText = LPSTR_TEXTCALLBACK; // using callbacks to get the
NewItem->mask = LVIF_IMAGE | LVIF_PARAM; // lParam and pszText fields
NewItem->iItem = 0; // position to insert new item
NewItem->iSubItem = 0;


void CMyListCtrl::OnGetdispinfoList(NMHDR* pNMHDR, LRESULT* pResult)
LV_ITEM *pItem = &(pDispInfo)->item;

if (pDispInfo->item.mask & LVIF_TEXT){

CMyListCtrl *pListCtrl = (CMyListCtrl *) pItem->lParam;

if(pItem->lParam != 0){
pListCtrl ->GetListText(*pItem);



Pls correct me if am going wrong

Tom Serface wrote:

You may want to consider using a CListCtrl instead. Take a look at this

To do this with a ListBox you would use the LBN_SELCHANGED message. You
don't really need to subclass to do this sort of thing. You could just
derive your own control from the CListBox.


<> wrote in message

hI guys,

I know that this is a good newsgroup where newsbies like me can learn a
lot from experienced professionals in this newsgroup but no response
for my question yet.
Is that this question has not been asked or is this a old question ?
Can some one answer this please.

Kavitha wrote:

Hi everyone,

I am a newbie to this group.
I have good exposure in VC++ but never used Callback mechanism.
I want to use callback function for a subclassed ListBoxcontrol when
the user selects an item and how can this be achived through links and

Thanks in advance

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