Handling WM_USER messages

[Bob Kirkwood]

Does anyone know how a C#/Forms application might handle a
user defined windows message. I need to do it for
migratin reasons.

[discu...@discussion.microsoft.com]

Try it, just an idea! *gasp!*

"Bob Kirkwood" <kirk...@k6mfg.com> wrote in message
news:047d01c3a313$71a37630$a101...@phx.gbl...

[discu...@discussion.microsoft.com]

If you send it and process it, why not.

Its just a number.

"Bob Kirkwood" <kirk...@k6mfg.com> wrote in message
news:047d01c3a313$71a37630$a101...@phx.gbl...

[Chris Dunaway]

The Form has WndProc that you can overload to catch those messages in a
form.

I think the Application class has a SetMessageFilter method thay may help
you.

Chris
--
Chris

To send me an E-mail, remove the underscores and lunchmeat from my E-Mail
address.

[Ying-Shen Yu[MSFT]]

Hi Bob,
Chris has given some idea on this issue, and I'd like to expand the
solution.
In Win32, we often handle the messages in wndproc , Now in WinForm the
WndProc still exists, every class derived from Control class have a
protected method named WndProc, you can override this method to handle your
own message of that control. Here is some snippet to show how to do this.
<code>
protected override void WndProc(ref Message m)
{
const int WM_USER = 0x0400;
If(m.Msg == WM_USER)
{
//call your handler here.
}
base.WndProc(ref m);
}
</code>
Also if you need to handle the message before it is dispatched, you may
implement the IMessageFilter interface to do this job, You can add a
MessageFilter to the MessageLoop by the Application.AddMessageFilter
method, to get more information on and sample code on this topic you may
take a look at the this link:
<Application.AddMessageFilter Method>
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/
frlrfsystemwindowsformsapplicationclassaddmessagefiltertopic.asp

Does this answer your problem?
Please be free to reply to this group, if you have anything unclear on it.
Thanks!

Best regards,

Ying-Shen Yu [MSFT]
Microsoft Online Partner Support
Get Secure! - www.microsoft.com/security

This posting is provided "AS IS" with no warranties and confers no rights.
You should not reply this mail directly, "Online" should be removed before
sending, Thanks!

[Bob Kirkwood]

WndProc was not sufficient, many messages arrived there,
but not my WM_USER message (actually WM_USER + 1).

Calling Application.AddMessageFilter (mymsgfilter) did
work. Thanks for the help.

>.
>

[news.microsoft.com]

Why doesnt WndProc allow processing of ALL mesages? Sounds stupid.

I would expect all messages to be available there and its up to me to
process what I need.

"Bob Kirkwood" <kirk...@k6mfg.com> wrote in message

news:0d0101c3a39d$55c20f00$a401...@phx.gbl...

[Ying-Shen Yu[MSFT]]

Hi,
Every class derived by control has an WndProc, probably in this case, the
overridden WndProc was not in the control which the WM_USER message posted
to. Anyway, IMessageFilter will work, because it will get all messages from
the message queue.