Re: how to tell if hwnd is valid


"Joseph M. Newcomer" <newcomer@xxxxxxxxxxxx> wrote in message
news:6e8194ppbtindjgboinq4lngvb754tn7ne@xxxxxxxxxx
See below...
On Wed, 30 Jul 2008 09:25:16 -0700, "Nick Schultz" <nick.schultz@xxxxxxxx>
wrote:

Well I am using Mr. Newcomer's Completion I/O MsgWrapper to send messages
between threads, however in large data bursts, the message pump gets
saturated and messages don't post.
****
That's simply not true. The whole point of the IOCP technique is so that
messages do NOT
get lost!
*****

What happens when PostMessage returns false?

BOOL PostMessage(
HWND hWnd,
UINT Msg,
WPARAM wParam,
LPARAM lParam
);
Return Value
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero.

your code deletes the message regardless of the return value

BOOL MsgWrapper::Forward()
{
BOOL result = wnd->PostMessage(msg, wParam, lParam));
delete this;
return result;
}

so if the message queue is filled, messages are dropped.

I see what you are saying about not closing the window until it has
processed all of its messages and will look into that.


.

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