Re: user defined WM_ question: update

Ahahahahaha, Shawn, I'm laughing my ass off!!!!!!! Take a look at the
SENS's IsDestinationReachable's return values:

BOOL IsDestinationReachable(
  __in     LPCSTR lpszDestination,
  __inout  LPQOCINFO lpQOCInfo
);

Return Value

Return code	Description
TRUE
A destination can be reached.
FALSE
A destination cannot be reached. To get extended error information,
call GetLastError.
ERROR_CALL_NOT_IMPLEMENTED
This function is not available on Windows Vista.

That's gotta be TROOL, not BOOL :)))))

Cheers

On Thu, Aug 27, 2009 at 12:07 AM, Shawn A. Van Ness<[email protected]> wrote:
>
>
> 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]>
>> 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
>> >>>
>> >>>
>> >>>
>> >>>
>> >>>
>> >>>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >
>> >
>> > ------------------------------------
>> >
>> > Yahoo! Groups Links
>> >
>> >
>> >
>> >
>> >
>>
>>
>> ------------------------------------
>>
>> Yahoo! Groups Links
>>
>>
>>
>>
>>
>>
>
>