Notify on IP Address Change

[Guest]

Hello,
I get my IP Address(es) by looping through
NetworkInterface.GetAllNetworkInterfaces() and
adapter.GetIPProperties().UnicastAddresses
This works fine! (see code snippet at the end)

But what, if one or all of the IP Address(es) will change? (By the User or
through DHCP etc.)
How can I detect this?
Is there something like an IPAddressChanged Event in the framework?

---code snippet ---
NetworkInterface[] adapters =
NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface adapter in adapters)
{
Console.WriteLine(adapter.Name);
IPInterfaceProperties adapterProperties =
adapter.GetIPProperties();
UnicastIPAddressInformationCollection uniCast =
adapterProperties.UnicastAddresses;
if (uniCast != null)
{
foreach (UnicastIPAddressInformation uni in uniCast)
{
Console.WriteLine(" IP Address : {0}", uni.Address);
}
Console.WriteLine();
}
}

 

[Tim Van Wassenhove]

rfw68 schreef:

But what, if one or all of the IP Address(es) will change? (By the User or
through DHCP etc.)
How can I detect this?

You could use iphlpapi.dll...

[DllImport("iphlpapi.dll", CharSet = CharSet.Ansi)]
private static extern int NotifyAddrChange(
[Out] IntPtr handle,
[In] IntPtr overlapped
);


// block untill an address changne occurs...
NotifyAddrChange(IntPtr.Zero, IntPtr.Zero);

 

[Guest]

Thanks! This will help me!

Robert Witter

 

[jacky kwok]

rfw68 schreef:

But what, if one or all of the IP Address(es) will change? (By the
User or through DHCP etc.)
How can I detect this?

You could use iphlpapi.dll...

[DllImport("iphlpapi.dll", CharSet = CharSet.Ansi)]
private static extern int NotifyAddrChange(
[Out] IntPtr handle,
[In] IntPtr overlapped
);


// block untill an address changne occurs...
NotifyAddrChange(IntPtr.Zero, IntPtr.Zero);

In Dotnet2, it has a
"System.Net.NetworkInformation.NetworkChange.NetworkAddressChanged"
event, it also can report the network address changed.

refer
http://msdn2.microsoft.com/en-us/li...tion.networkchange.networkaddresschanged.aspx

 

[Steven Cheng[MSFT]]

Hi Robert,

I think the "NetworkChange" class Jack mentioned is what you need.

http://msdn2.microsoft.com/en-us/library/system.net.networkinformation.netwo
rkchange.aspx

You can register the eventhandler and receive notification of network
interface status change in a pure managed code style.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead


This posting is provided "AS IS" with no warranties, and confers no rights.

 

[Guest]

Ah, I wondered, that there is no sollution in .NET, but I just dont found it.
I searched for "IPAddress Changed", not for "Network Address".

Thank you very much!
Regards,
Robert

rfw68 schreef:

But what, if one or all of the IP Address(es) will change? (By the
User or through DHCP etc.)
How can I detect this?

You could use iphlpapi.dll...

[DllImport("iphlpapi.dll", CharSet = CharSet.Ansi)]
private static extern int NotifyAddrChange(
[Out] IntPtr handle,
[In] IntPtr overlapped
);


// block untill an address changne occurs...
NotifyAddrChange(IntPtr.Zero, IntPtr.Zero);

In Dotnet2, it has a
"System.Net.NetworkInformation.NetworkChange.NetworkAddressChanged"
event, it also can report the network address changed.

refer
http://msdn2.microsoft.com/en-us/li...tion.networkchange.networkaddresschanged.aspx

 

[Guest]

Hi Steven,

Yes, it is - works fine!
Thanks,
Robert

 

[Tim Van Wassenhove]

jacky kwok schreef:

rfw68 schreef:

But what, if one or all of the IP Address(es) will change? (By the
User or through DHCP etc.)
How can I detect this?

You could use iphlpapi.dll...

[DllImport("iphlpapi.dll", CharSet = CharSet.Ansi)]
private static extern int NotifyAddrChange(
[Out] IntPtr handle,
[In] IntPtr overlapped
);


// block untill an address changne occurs...
NotifyAddrChange(IntPtr.Zero, IntPtr.Zero);

In Dotnet2, it has a
"System.Net.NetworkInformation.NetworkChange.NetworkAddressChanged"
event, it also can report the network address changed.

refer
http://msdn2.microsoft.com/en-us/li...tion.networkchange.networkaddresschanged.aspx

ACK Always nice to discover something