How to get the configured subnet mask for this machine?

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4 total messages Started by Mike Knoblock Wed, 12 Apr 2006 21:41

#2453

Author: Mike Knoblock
Date: Wed, 12 Apr 2006 21:41

11 lines
1300 bytes

Anyone know how to use WINAPI to retrieve the subnet mask for a given 
interface?  I can programmatically retrieve a list of IP addresses with 
gethostbyname, but this doesn't deal with configured subnets.

What's behind all this is I need an application to send a subnet 
broadcast message on startup to find other instances of itself. Running 
IPCONFIG from a shell is messy, and I can't find anything on MSDN.

TIA

Mike

Re: How to get the configured subnet mask for this machine?

#2455

Author: JF Jolin
Date: Wed, 12 Apr 2006 23:03

16 lines
1498 bytes

12 Apr 2006 14:41:53 -0700, Mike Knoblock <mknoblock@gmail.com> wrote:

> Anyone know how to use WINAPI to retrieve the subnet mask for a given interface?

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/iphlp/iphlp/getadaptersinfo.asp

> I can programmatically retrieve a list of IP addresses with gethostbyname,
> but this doesn't deal with configured subnets.
>
> What's behind all this is I need an application to send a subnet broadcast message
> on startup to find other instances of itself. Running IPCONFIG from a shell is messy,
> and I can't find anything on MSDN.


-- 
JF Jolin

Re: How to get the configured subnet mask for this machine?

#2456

Author: Mike Knoblock
Date: Wed, 12 Apr 2006 23:13

25 lines
1666 bytes

I looked; I swear!

Thanks!!


JF Jolin wrote:
> 12 Apr 2006 14:41:53 -0700, Mike Knoblock <mknoblock@gmail.com> wrote:
> 
>> Anyone know how to use WINAPI to retrieve the subnet mask for a given 
>> interface?
> 
> http://msdn.microsoft.com/library/default.asp?url=/library/en-us/iphlp/iphlp/getadaptersinfo.asp 
> 
> 
>> I can programmatically retrieve a list of IP addresses with 
>> gethostbyname,
>> but this doesn't deal with configured subnets.
>>
>> What's behind all this is I need an application to send a subnet 
>> broadcast message
>> on startup to find other instances of itself. Running IPCONFIG from a 
>> shell is messy,
>> and I can't find anything on MSDN.
> 
>

Re: How to get the configured subnet mask for this machine?

#2457

Author: Remy Lebeau (TeamB)
Date: Thu, 13 Apr 2006 00:59

23 lines
1624 bytes

"Mike Knoblock" <mknoblock@gmail.com> wrote in message
news:443d7421$1@newsgroups.borland.com...

> Anyone know how to use WINAPI to retrieve the subnet mask
> for a given interface?

Look at the GetAdaptersInfo() function in the IPHLR API:

    GetAdaptersInfo
    http://msdn.microsoft.com/library/en-us/iphlp/iphlp/getadaptersinfo.asp

The IP_ADAPTER_INFO structure has several members that deal with IP
addresses and masks.  They are all of type IP_ADDR_STRING, which has an
IpMask member.

> I can programmatically retrieve a list of IP addresses with
> gethostbyname, but this doesn't deal with configured subnets.

There is nothing in the WinSock API for what you ask.


Gambit

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