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Summary

DNSQueryEx (built off DNSQuery page)

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Provides a more customisable query than DNSQuery - uses an Async callback

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[DllImport("dnsapi", EntryPoint = "DnsQueryEx", CharSet = CharSet.Unicode, SetLastError = true, ExactSpelling = true)]

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    private static extern int DnsQueryEx(IntPtr queryRequest, IntPtr queryResults, IntPtr cancelHandle);

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    public class DNSQueryer

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    private const int DNSQueryCancelSize = 32;

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    private const uint DnsQueryRequestVersion1 = 1;

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    private enum DnsQueryOptions

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        DNSQueryResult queryResult = new DNSQueryResult();

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        queryResult.Version = DnsQueryRequestVersion1;

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        IntPtr result = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(DNSQueryResult)));

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        IntPtr cancelBuffer = Marshal.AllocHGlobal(DNSQueryCancelSize);

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        int resCode = DnsQueryEx(dnsRequest, result, cancelBuffer);

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            queryResult = (DNSQueryResult)Marshal.PtrToStructure(result, typeof(DNSQueryResult));

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        request.Version = DnsQueryRequestVersion1;

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        request.QueryOptions = (ulong)DnsQueryOptions.DNS_QUERY_STANDARD;

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        DNSQueryResult queryResult = (DNSQueryResult)Marshal.PtrToStructure(queryResults, typeof(DNSQueryResult));

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    [DllImport("dnsapi", EntryPoint = "DnsQueryEx", CharSet = CharSet.Unicode, SetLastError = true, ExactSpelling = true)]

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    private static extern int DnsQueryEx(IntPtr queryRequest, IntPtr queryResults, IntPtr cancelHandle);

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    private struct DNSQueryResult

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Documentation

[DnsQueryEx] on MSDN

.

Summary

DNSQueryEx (built off DNSQuery page)

.

Provides a more customisable query than DNSQuery - uses an Async callback

.

[DllImport("dnsapi", EntryPoint = "DnsQueryEx", CharSet = CharSet.Unicode, SetLastError = true, ExactSpelling = true)]

.

    private static extern int DnsQueryEx(IntPtr queryRequest, IntPtr queryResults, IntPtr cancelHandle);

.

    public class DNSQueryer

.

    private const int DNSQueryCancelSize = 32;

.

    private const uint DnsQueryRequestVersion1 = 1;

.

    private enum DnsQueryOptions

.

        DNSQueryResult queryResult = new DNSQueryResult();

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        queryResult.Version = DnsQueryRequestVersion1;

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        IntPtr result = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(DNSQueryResult)));

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        IntPtr cancelBuffer = Marshal.AllocHGlobal(DNSQueryCancelSize);

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        int resCode = DnsQueryEx(dnsRequest, result, cancelBuffer);

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            queryResult = (DNSQueryResult)Marshal.PtrToStructure(result, typeof(DNSQueryResult));

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        request.Version = DnsQueryRequestVersion1;

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        request.QueryOptions = (ulong)DnsQueryOptions.DNS_QUERY_STANDARD;

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        DNSQueryResult queryResult = (DNSQueryResult)Marshal.PtrToStructure(queryResults, typeof(DNSQueryResult));

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    [DllImport("dnsapi", EntryPoint = "DnsQueryEx", CharSet = CharSet.Unicode, SetLastError = true, ExactSpelling = true)]

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    private static extern int DnsQueryEx(IntPtr queryRequest, IntPtr queryResults, IntPtr cancelHandle);

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    private struct DNSQueryResult

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Documentation

[DnsQueryEx] on MSDN