How to perform "nslookup host server"

c# api nslookup
Roman picture Roman · Mar 29, 2011 · Viewed 11.5k times · Source

My C# service needs to periodically poll nslookup host server. Currently it spawns a Process that executes batch script. Due to performance reason I'm considering to do this check using some API. But the problem is, that using, for example, System.Net.Dns.GetHostAddresses I can only emulate nslookup host check, but not nslookup host server (without seconds param).

I've looked at bunch of similar SO questions, but none of them seem to solve my issue.

Are there any way to perform nslookup host server in C# without using some heavy third-patry library?

Answer

Roman picture Roman · Mar 31, 2011

The problem was solved!

http://msdn.microsoft.com/en-us/library/ms682016(VS.85).aspx

See "Great Example here" section

[DllImport("dnsapi", EntryPoint="DnsQuery_W", CharSet=CharSet.Unicode, SetLastError=true, ExactSpelling=true)]
private static extern int DnsQuery([MarshalAs(UnmanagedType.VBByRefStr)]ref string pszName, QueryTypes wType, QueryOptions options, int aipServers, ref IntPtr ppQueryResults, int pReserved);
[DllImport("dnsapi", CharSet=CharSet.Auto, SetLastError=true)]
private static extern void DnsRecordListFree(IntPtr pRecordList, int FreeType);

...

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