Re: user defined WM_ question: update

This is what SENS (system event notification service) is for.
http://msdn.microsoft.com/en-us/library/aa376627.aspx

There's also NLA (network location awareness) which offers some ioctl-based
notification mechanism...  probably also something in WMI...  probably 3
more ways this is exposed that I don't even know about.

-S

On Tue, Aug 25, 2009 at 3:49 PM, Eric Strain <eric_strain1-/[email protected]> wrote:

>
>
>     I looked at that function and it looks like that might do the trick.
> I'll have to write a test app and test it first but it looks promising.
> Thanks.
>
> -Eric
>
> --- On *Tue, 8/25/09, Stoyan Damov <[email protected]>* wrote:
>
>
> From: Stoyan Damov <[email protected]>
> Subject: Re: [OT] user defined WM_ question: update
> To: [email protected]
> Date: Tuesday, August 25, 2009, 3:26 PM
>
>
> You could poll the interfaces in interest by calling
> InternetGetConnectedStateEx, or harness your Google skills ;)
>
> On Wed, Aug 26, 2009 at 1:23 AM, Eric Strain<eric_strain1-/[email protected]<http://mc/compose?to=eric_strain1-/[email protected]>>
> wrote:
> >
> >
> > primarily I am trying to duplicate the functionality in windows that
> > notifies the user when the network has limited or no connectivity. I want
> > my app to know when the network has limited or no connectivity. Any idea
> how
> > windows detects that condition?
> >
> > -Eric
> >
> > --- On Tue, 8/25/09, Stoyan Damov <[email protected]<http://mc/[email protected]>>
> wrote:
> >
> > From: Stoyan Damov <[email protected]<http://mc/[email protected]>
> >
> > Subject: Re: [OT] user defined WM_ question: update
> > To: [email protected]<http://mc/compose?to=win_tech_off_topic-hHKSG33TihhbjbujkaE4pw@public.gmane.org>
> > Date: Tuesday, August 25, 2009, 2:52 PM
> >
> > You *can't* possibly be thinking that every Windows machine
> > continuously polls all machines on the network to detect if any of
> > them is down.
> > If that's what you're trying to accomplish, develop an app which
> > multicasts heartbeats on a configurable time interval and run it on
> > all machines. Then, on the machine on which you'd like to detect
> > outages, create and run an app which listens for such heartbeats,
> > collects all ips from the heartbeats, and if it detects that an ip
> > hadn't sent a heartbeat in some time interval it notifies the UI.
> >
> > Anything "simpler" sounds like "I need a Delphi component which can
> > put a lion in a cage which I can drop on my form"...
> >
> > Cheers
> >
> > On Wed, Aug 26, 2009 at 12:41 AM, Eric Strain<eric_strain1-/[email protected]<http://mc/compose?to=eric_strain1-/[email protected]>>
> wrote:
> >>
> >>
> >> Hi Curt,
> >> Thanks for the reply. What I am trying to do is have my application
> >> automatically know as soon as any network failure of any kind occurs.
> This
> >> includes anything from someone unplugging the network cable, to a server
> >> on
> >> the network going down for some reason. I'm using MFC with VC6.0
> >> Professional IDE on WinXP. I'm hoping there is an API available and that
> I
> >> don't have to resort to .NET to accomplish what I want. Any ideas?
> >>
> >> -Eric
> >>
> >> --- On Mon, 8/24/09, Curt Hagenlocher <[email protected]<http://mc/[email protected]>>
> wrote:
> >>
> >> From: Curt Hagenlocher <[email protected]<http://mc/[email protected]>
> >
> >> Subject: Re: [OT] user defined WM_ question: update
> >> To: [email protected]<http://mc/compose?to=win_tech_off_topic-hHKSG33TihhbjbujkaE4pw@public.gmane.org>
> >> Date: Monday, August 24, 2009, 4:24 PM
> >>
> >>
> >>
> >> I imagine you still need some kind of listener for the "targeted event".
> >> Your listener could then use PostMessage(WM_MYEVENT, 0, 0) to tell the
> UI
> >> thread that the event has happened. You haven't provided any specific
> >> information about the "targeted event", though -- for all I know, it's
> got
> >> a
> >> specialized API to do exactly what you want.
> >> On Mon, Aug 24, 2009 at 2:00 PM, Eric Strain <eric_strain1-/[email protected]<http://mc/compose?to=eric_strain1-/[email protected]>
> >
> >> wrote:
> >>>
> >>>
> >>> OK, I got the WM_USER code to work, now is it possible to get the event
> >>> handler to fire automatically? I really don't want to use polling, even
> >>> if
> >>> it is on a separate thread. Currently I have the WM_USER event being
> >>> triggered through SendMessage(WM_MYEVENT,0,0); inside an OnClicked( )
> >>> handler attached to a UI button. Although this is working in my test
> app,
> >>> I
> >>> want the event to be fired automatically by the OS when the targeted
> >>> event
> >>> occurs.
> >>>
> >>> Any ideas? Thanks guys.
> >>>
> >>> -Eric
> >>>
> >>> --- On Sun, 8/23/09, Eric Strain <eric_strain1-/[email protected]<http://mc/compose?to=eric_strain1-/[email protected]>>
> wrote:
> >>>
> >>> From: Eric Strain <eric_strain1-/[email protected]<http://mc/compose?to=eric_strain1-/[email protected]>
> >
> >>> Subject: [OT] user defined WM_ question
> >>> To: [email protected]<http://mc/compose?to=win_tech_off_topic-hHKSG33TihhbjbujkaE4pw@public.gmane.org>
> >>> Date: Sunday, August 23, 2009, 5:17 PM
> >>>
> >>>
> >>>
> >>> Hi All,
> >>> I have a function that I need to fire when a specific event occurs. The
> >>> event that I need to trap is a network failure of any kind. I have the
> >>> code
> >>> that detects when a network failure has occurred but at present the
> >>> function
> >>> is inside a command line interface program and I want to transfer that
> >>> function into an MFC app and have the function activated by a WM_
> event.
> >>> My
> >>> question is, is it possible to get the user defined WM_ to fire
> >>> automatically, or does the user have to send the event message
> manually,
> >>> such as by clicking a UI button or something?
> >>>
> >>> Also, I considered using WM_USER to define the custom WM_ message, but
> my
> >>> research indicates that WM_APP is the preferred method for defining a
> >>> custom
> >>> message. Any thoughts on this? Even better, any concrete examples? ; )
> >>> I've
> >>> looked all over the net and through my library of books with no luck.
> >>> It's a
> >>> shame a person can't loose weight by running in circles, because I seem
> >>> to
> >>> be getting nowhere fast. Thanks guys.
> >>>
> >>> -Eric
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>
> >>
> >>
> >>
> >>
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>
>
>
>