List control problem

[shteev]

I'm writing an appliction in Visual C++ 6 using a List Control. When the item highlighted in the list changes, I want a message to be sent so I know, so that I can update an Edit Box (which contains text from the highlighted member of the list). But there doesn't seem to be an appropriate message I can use. Is there? Or will I have to do this another way?

 

[apatterno]

How about [tt]LBN_SELCHANGE[/tt]?

[sub]I REALLY hope that helps.[/sub]
Will

 

[shteev]

Hmm. I've been using a list view control so far in my app, using the 'report' view. LBN_SELCHANGE is generated for list boxes, but not list view controls. I'm off to experiment now to see if I can get away with using a List Box, but I'd still like to know; is there a similar message to LBN_SELCHANGE for list view controls?

 

[apatterno]

Oh.. I didn't read carefully, sorry. you mean List View Controls, don't you.

MFC calls them List Controls to avoid confusion with CListView I think... stupid naming conventions.

Anyway, in that case, the answer is LVN_ITEMACTIVATE.

(From MSDN

> Remarks:

> To obtain the items being activated, the receiving
> application should use the LVM_GETSELECTEDCOUNT message
> to retrieve the number of items that are selected and
> then send the LVM_GETNEXTITEM message with LVNI_SELECTED
> until all of the items have been retrieved.


[sub]I REALLY hope that helps.[/sub]
Will

 

[shteev]

Cheers for that.

However, it isn't supported by the Class Wizard, and I'm not sure exactly how to put it into the code. Can you show me how I can use it to call a function?

 

[grindstonegirl]

you can check to see if an item is selected whenever the list is clicked. Use NM_click from the wizard. that means someone clicked in the list. you can then check to see if they selected an item by using the methods of clistctrl.

 

[shteev]

Thats true; but it doesn't detect when a key is used to change the selected item. I suppose I could trap that separately.

I asked a friend of mine who had the same problem; he ended up using a short timer to continually check what item was selected.

It all seems like a bit of a bodge, tho, especially if there's a message set up specifically to handle this situation. If I figure out how to use it I'll let you know.