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Asked: 2026-05-27T07:26:09+00:00

I am not all that familiar with unmanaged code but have been using some

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I am not all that familiar with unmanaged code but have been using some of the methods in dnsapi.dll in my C# application. There are lots of examples on how to use DnsQuery, or DnsFlushResolverCache for example, but the method DnsValidateServerStatus seems to be new (requiring Win 7 or Server 2008 R2). I would like to use this method from my C# application but I can’t seem to get the Marshaling and structures to work correctly. The documentation for this method can be found at:
http://msdn.microsoft.com/en-us/library/windows/desktop/ee837436(v=VS.85).aspx

Please help!

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1 Answer

  1. Editorial Team

    The difficult part of this Win32 API is the SOCKADDR structure. On PINVOKE.NET there is an implementation of the SOCKADDR structure. The following example is based on this implementation:

    [DllImport("Dnsapi.dll")]
private static extern int  DnsValidateServerStatus(IntPtr sockaddr, string queryName, ref uint serverStatus);

WinsockSockAddr addr = new WinsockSockAddr(IPAddress.Parse("127.0.0.1"), 0);
uint serverStatus = 0;
int status = DnsValidateServerStatus(addr.PinnedSockAddr, "fqdn server name", ref serverStatus);

Console.Out.WriteLine(status);
Console.Out.WriteLine(serverStatus);

    Hope, this helps.

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