Re: SendMessageToDescendents problem

From:

"Doug Harrison [MVP]" <dsh@mvps.org>

Newsgroups:

microsoft.public.vc.mfc

Date:

Wed, 02 Aug 2006 13:00:15 -0500

Message-ID:

<tpp1d251ekpua4bnca830gfm1l7tnt4moj@4ax.com>

On 2 Aug 2006 07:49:45 -0700, PloutzMR@Npt.NUWC.Navy.Mil wrote:

Another noob question...

I need to pass a message from a main frame window to one of its
children...the child is created with

    dlg = new Window();
    dlg->Create(IDD_TABHOLDER,this);
    dlg->ShowWindow(SW_SHOW);

within the main frame. Then the message is sent:

    SendMessageToDescendants(OECM_MESSAGE,0,0,true);

In the child dialog class, I do the following:

BOOL ViewConnections::PreTranslateMessage(MSG* pMsg)
{
    // TODO: Add your specialized code here and/or call the base class

    CString msg;
    CTime theTime = CTime::GetCurrentTime(); //the current time

    switch (pMsg->message)
    {
        case OECM_MESSAGE:
            msg.Format("{%02d:%02d:%02d} SubSkillsNet Connection
Established",theTime.GetHour(),
theTime.GetMinute(),theTime.GetSecond());
            listbox.AddString(msg);
            UpdateData(false);
            break;
            default:

            break;
    }

    return CDialog::PreTranslateMessage(pMsg);
}

But the child dialog never receives the message...this was confirmed
with a print statement inside the first case of the switch
statement....Any ideas here?

One of the pitfalls of PreTranslateMessage is that it is only called for
messages retrieved from the message queue. Messages sent directly to a
window don't go through PreTranslateMessage. Your child dialog should
handle OECM_MESSAGE rather than override PreTranslateMessage.

--
Doug Harrison
Visual C++ MVP