Re: trouble posting message from a ccombo

From: AliR (AliR_at_newsgroup.nospam)
Date: 02/25/05 

Date: Fri, 25 Feb 2005 20:38:28 GMT

CBN_SELCHANGE is a notification message that is sent throught WM_COMMAND. I
know the documentation is not very good, but read the documentation on
CBN_SELCHANGE a bit more carefully. I think that MFC's message mapping has
made people lazy.

On a serious note reading a Win32 book cover to cover would help any MFC
programmer understand what is going on under the hood a bit more.

So here is what you have to do

GetParent()->PostMessage(WM_COMMAND,MAKEWPARAM(GetDlgCtrlID(),CBN_SELCHANGE)
,m_hWnd);

I will let Joseph Newcomer rag on you for using PostMessage instead of
SendMessage. ;)

AliR.

"brett" <brett_w2931@hotmail.com> wrote in message
news:TJ-dnaFUa-jzF4LfRVn-vg@adelphia.com...
> Hi,
>
> I'm implementing a custom combo box thats doing some autocomplete stuff
from
> a database. When I'm handling the CBN_EDITCHANGE message, I find that the
> text matches exactly and i want to inform the parent about this. I
> accomplish this by sending a message as if a new item was selected:
>
> GetParent()->PostMessage(CBN_SELCHANGE, WPARAM(GetDlgCtrlID()),
> LPARAM(m_hWnd));
>
> I've also tried calling this from the combo class:
> PostMessage(CBN_SELCHANGE, WPARAM(GetDlgCtrlID()), LPARAM(m_hWnd));
>
> since i'm using ON_CONTROL_REFLECT_EX message handlers to make sure that
the
> parent dialog is going to get the messages.
>
> Unfortunately, both the PostMessages are returning 0. If I call DWORD d =
> ::GetLastError(); I find an error: ERROR_INVALID_ADDRESS
>
> What have I done wrong?
>
> Thanks,
> Brett.
>
>
>

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