Re: Child Window Creation

"AliR \(VC++ MVP\)" <AliR@online.nospam>
Tue, 5 May 2009 10:21:16 -0500
That's not entirely true. When the control is attached to the object using
DDX_Control, and you post a message from within PreSubclassWindow, there are
a host of other messages that can be sent to the window before your posted
message gets processed, for example WM_PAINT is one that will almost always
gets processed before the user posted message.


"Malachy Moses" <> wrote in message
On May 4, 2:19 pm, "AliR \(VC++ MVP\)" <A...@online.nospam> wrote:

Hi Everyone,

First of all don't laugh, at least try not to.

I have a CWnd derived class, which gets created using Create method and in
some places gets subclassed using DDX_Control.

Now this CWnd derived class needs to create some child controls of its

Where would you create these child controls?

If I do it in PreSubclassWindow, it will only work correctly when the
control is subclassed using DDX_Control, and will break when it is created
with Create, since the window is not created yet, and there is no HWND.

If I do it in OnCreate, then it will work for windows that are dynamically
created using Create, but not for subclassed ones, since it will never get

P.S. this question should get my MVP revoked.

In similar situations, from inside PreSubclassWindow, I have
PostMessage'd a custom message to myself (like
UWM_DOPOSTCREATIONINIT). The message seems to be inserted right
behind the WM_CREATE message, and gets handled right after it.

As you know, PreSubclassWindow is called from both the DDX-dialog
route and the Create(Ex) route, so you need the PostMessage only from
inside PreSubclassWindow, and you don't need a bunch of flags to keep
track of what gets done when.

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