Re: user defined WM_ question: update

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]> 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]> wrote:
>
> From: Stoyan Damov <[email protected]>
> Subject: Re: [OT] user defined WM_ question: update
> To: [email protected]
> 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]> 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]> wrote:
>>
>> From: Curt Hagenlocher <[email protected]>
>> Subject: Re: [OT] user defined WM_ question: update
>> To: [email protected]
>> 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]>
>> 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]> wrote:
>>>
>>> From: Eric Strain <eric_strain1-/[email protected]>
>>> Subject: [OT] user defined WM_ question
>>> To: [email protected]
>>> 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
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>
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