Network Discovery

[=?Utf-8?B?Tmljb2xhcw==?=]

Basically I got a LAN with several computer.
From Computer A I'll got my appliation which should do the following:
Check if any other computer lost connection to the network. (Computer B may
has been shutdown, While computer C cable has been unplug, etc.).

I used to check if a file exist on each computer by running a loop. This way
is to slow and too much CPU demanding for nothing.

Is there anty other way like a listener of some sort to catch connection
lost from other computer into the network. (Eventually I may know the IP or
computer name that I want to check).

Thank you.

[Gillard]

Re: Network Discovery

use a timer

ub pingg(ByVal adress As String, ByVal timeout As Int32)
If My.Computer.Net work.IsAvailabl e Then
Try
If My.Computer.Net work.Ping(adres s, timeout) Then
MsgBox(adress & vbCrLf & "ok", MsgBoxStyle.Inf ormation,
Me.Text)
Else
MsgBox(adress & vbCrLf & "failled",
MsgBoxStyle.Exc lamation, Me.Text)
End If
Catch ex As Exception
MessageBox.Show (ex.Message, Me.Text, MessageBoxButto ns.OK,
MessageBoxIcon. Error)
End Try
End If
End Sub

"Nicolas" <Nicolas@discus sions.microsoft .comwrote in message
news:0750C864-C486-405F-8EB6-4030176D0D2E@mi crosoft.com...

Basically I got a LAN with several computer.
From Computer A I'll got my appliation which should do the following:
Check if any other computer lost connection to the network. (Computer B
may
has been shutdown, While computer C cable has been unplug, etc.).
>
I used to check if a file exist on each computer by running a loop. This
way
is to slow and too much CPU demanding for nothing.
>
Is there anty other way like a listener of some sort to catch connection
lost from other computer into the network. (Eventually I may know the IP
or
computer name that I want to check).
>
Thank you.
>
>

[=?Utf-8?B?Tmljb2xhcw==?=]

Re: Network Discovery

Is there any other way then a Timer since it's doing a loop which could run
for days.

"Gillard" wrote:

use a timer
>
ub pingg(ByVal adress As String, ByVal timeout As Int32)
If My.Computer.Net work.IsAvailabl e Then
Try
If My.Computer.Net work.Ping(adres s, timeout) Then
MsgBox(adress & vbCrLf & "ok", MsgBoxStyle.Inf ormation,
Me.Text)
Else
MsgBox(adress & vbCrLf & "failled",
MsgBoxStyle.Exc lamation, Me.Text)
End If
Catch ex As Exception
MessageBox.Show (ex.Message, Me.Text, MessageBoxButto ns.OK,
MessageBoxIcon. Error)
End Try
End If
End Sub
>
"Nicolas" <Nicolas@discus sions.microsoft .comwrote in message
news:0750C864-C486-405F-8EB6-4030176D0D2E@mi crosoft.com...

Basically I got a LAN with several computer.
From Computer A I'll got my appliation which should do the following:
Check if any other computer lost connection to the network. (Computer B
may
has been shutdown, While computer C cable has been unplug, etc.).

I used to check if a file exist on each computer by running a loop. This
way
is to slow and too much CPU demanding for nothing.

Is there anty other way like a listener of some sort to catch connection
lost from other computer into the network. (Eventually I may know the IP
or
computer name that I want to check).

Thank you.

>

[James Hahn]

Re: Network Discovery

This has already been done in several places, and you may be able to get
some ideas. See, for instance:

http://www.a1vbcode.com/app-4403.asp

You should also consider whether you can use the facilities of .Net, such as
the FileSystemWatch er class.

"Nicolas" <Nicolas@discus sions.microsoft .comwrote in message
news:0750C864-C486-405F-8EB6-4030176D0D2E@mi crosoft.com...

Basically I got a LAN with several computer.
From Computer A I'll got my appliation which should do the following:
Check if any other computer lost connection to the network. (Computer B
may
has been shutdown, While computer C cable has been unplug, etc.).
>
I used to check if a file exist on each computer by running a loop. This
way
is to slow and too much CPU demanding for nothing.
>
Is there anty other way like a listener of some sort to catch connection
lost from other computer into the network. (Eventually I may know the IP
or
computer name that I want to check).
>
Thank you.
>
>

[Gillard]

Re: Network Discovery

use a loop with a process.sleep

"Nicolas" <Nicolas@discus sions.microsoft .comwrote in message
news:9A30F255-2DC8-410E-9396-0C061AE210BB@mi crosoft.com...

Is there any other way then a Timer since it's doing a loop which could
run
for days.
>
"Gillard" wrote:
>

>use a timer
>>
>ub pingg(ByVal adress As String, ByVal timeout As Int32)
> If My.Computer.Net work.IsAvailabl e Then
> Try
> If My.Computer.Net work.Ping(adres s, timeout) Then
> MsgBox(adress & vbCrLf & "ok",
>MsgBoxStyle.In formation,
>Me.Text)
> Else
> MsgBox(adress & vbCrLf & "failled",
>MsgBoxStyle.Ex clamation, Me.Text)
> End If
> Catch ex As Exception
> MessageBox.Show (ex.Message, Me.Text,
>MessageBoxButt ons.OK,
>MessageBoxIcon .Error)
> End Try
> End If
> End Sub
>>
>"Nicolas" <Nicolas@discus sions.microsoft .comwrote in message
>news:0750C86 4-C486-405F-8EB6-4030176D0D2E@mi crosoft.com...

Basically I got a LAN with several computer.
From Computer A I'll got my appliation which should do the following:
Check if any other computer lost connection to the network. (Computer B
may
has been shutdown, While computer C cable has been unplug, etc.).
>
I used to check if a file exist on each computer by running a loop.
This
way
is to slow and too much CPU demanding for nothing.
>
Is there anty other way like a listener of some sort to catch
connection
lost from other computer into the network. (Eventually I may know the
IP
or
computer name that I want to check).
>
Thank you.
>
>

>>

[Gillard]

Re: Network Discovery

sorry
Threading.Threa d.Sleep(1000)


"Gillard" <gillard_george s@@@@@@@@@hotma il.comwrote in message
news:eSiAF$HIJH A.4408@TK2MSFTN GP06.phx.gbl...

use a loop with a process.sleep
>
"Nicolas" <Nicolas@discus sions.microsoft .comwrote in message
news:9A30F255-2DC8-410E-9396-0C061AE210BB@mi crosoft.com...

>Is there any other way then a Timer since it's doing a loop which could
>run
>for days.
>>
>"Gillard" wrote:
>>

>>use a timer
>>>
>>ub pingg(ByVal adress As String, ByVal timeout As Int32)
>> If My.Computer.Net work.IsAvailabl e Then
>> Try
>> If My.Computer.Net work.Ping(adres s, timeout) Then
>> MsgBox(adress & vbCrLf & "ok",
>>MsgBoxStyle.I nformation,
>>Me.Text)
>> Else
>> MsgBox(adress & vbCrLf & "failled",
>>MsgBoxStyle.E xclamation, Me.Text)
>> End If
>> Catch ex As Exception
>> MessageBox.Show (ex.Message, Me.Text,
>>MessageBoxBut tons.OK,
>>MessageBoxIco n.Error)
>> End Try
>> End If
>> End Sub
>>>
>>"Nicolas" <Nicolas@discus sions.microsoft .comwrote in message
>>news:0750C8 64-C486-405F-8EB6-4030176D0D2E@mi crosoft.com...
>Basically I got a LAN with several computer.
>From Computer A I'll got my appliation which should do the following:
>Check if any other computer lost connection to the network. (Computer
>B
>may
>has been shutdown, While computer C cable has been unplug, etc.).
>>
>I used to check if a file exist on each computer by running a loop.
>This
>way
>is to slow and too much CPU demanding for nothing.
>>
>Is there anty other way like a listener of some sort to catch
>connection
>lost from other computer into the network. (Eventually I may know the
>IP
>or
>computer name that I want to check).
>>
>Thank you.
>>
>>
>>>

[Cor Ligthert[MVP]]

Re: Network Discovery

Nicolas,

In my idea is for this Directory Services.

Be aware the the documentation around it is still fair.

http://msdn.microsoft.com/en-us/library/ms682458(VS.85).aspx

(As you use HDLC then you have no fixex IP addresses that you can ping)



Cor

"Nicolas" <Nicolas@discus sions.microsoft .comschreef in bericht
news:0750C864-C486-405F-8EB6-4030176D0D2E@mi crosoft.com...

Basically I got a LAN with several computer.
From Computer A I'll got my appliation which should do the following:
Check if any other computer lost connection to the network. (Computer B
may
has been shutdown, While computer C cable has been unplug, etc.).
>
I used to check if a file exist on each computer by running a loop. This
way
is to slow and too much CPU demanding for nothing.
>
Is there anty other way like a listener of some sort to catch connection
lost from other computer into the network. (Eventually I may know the IP
or
computer name that I want to check).
>
Thank you.
>
>