Re: WM_DROPFILES

From:

"AliR $VC++ MVP$" <AliR@online.nospam>

Newsgroups:

microsoft.public.vc.mfc

Date:

Thu, 15 Nov 2007 15:48:54 -0600

Message-ID:

<od3%i.5560$852.1259@newssvr17.news.prodigy.net>

Try calling the listbox's DragAcceptFile() in the OnInitDialog.

m_ListBox.DragAcceptFile();

AliR.

"David Webber" <dave@musical-dot-demon-dot-co.uk> wrote in message
news:O4$3438JIHA.5788@TK2MSFTNGP06.phx.gbl...

I have a list box which lists files, and I thought it would be nice to come
into the 21st century by letting folk drag and drop more files onto it. But
I'm having problems making it work.

I call DragAcceptFiles( TRUE ) during the OnInitDialog() of the parent
dialogue (actually a property page). I am rewarded by the mouse cursor
changing appropriately when I drag a file over the list box.

And then having

class CMyListBox : public CListBox
{
};

I include for the moment:

BEGIN_MESSAGE_MAP( CMyListBox, CListBox )
    ON_WM_DROPFILES()
END_MESSAGE_MAP()

void CMyListBox::OnDropFiles( HDROP hDropInfo )
{
   AfxMessageBox( _T("Hello"), MB_OK );

    CListBox::OnDropFiles( hDropInfo );
    return;
}

I put the message box in there because I didn't expect it to work in the
debug code as drag and drop seems not to work there (under Vista at
least). But I'm not getting the message in a release build either.

Any ideas why not?

[There seems to be no such thing as ON_WM_DROPFILES_REFLECT() and so I
assume the control *should* be getting the message!]

Dave
--
David Webber
Author of 'Mozart the Music Processor'
http://www.mozart.co.uk
For discussion/support see
http://www.mozart.co.uk/mozartists/mailinglist.htm