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POWinAPI equivalent of Win32_ComputerSystem.Domain
 

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  1. POWinAPI equivalent of Win32_ComputerSystem.Domain
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    <p>My app is running on a computer that is joined to an Active Directory domain. Is there a way to get that domain's DNS name using WinAPI methods? I want something that will work even if there are no DNS servers or Domain Controllers available.</p> <p>Right now, the only way I can find is through the Domain property of the Win32_ComputerSystem WMI class:</p> <pre><code>using System.Management; public class WMIUtility { public static ManagementScope GetDefaultScope(string computerName) { ConnectionOptions connectionOptions = new ConnectionOptions(); connectionOptions.Authentication = AuthenticationLevel.PacketPrivacy; connectionOptions.Impersonation = ImpersonationLevel.Impersonate; string path = string.Format("\\\\{0}\\root\\cimv2", computerName); return new ManagementScope(path, connectionOptions); } public static ManagementObject GetComputerSystem(string computerName) { string path = string.Format("Win32_ComputerSystem.Name='{0}'", computerName); return new ManagementObject( GetDefaultScope(computerName), new ManagementPath(path), new ObjectGetOptions() ); } public static string GetDNSDomainName(string computerName) { using (ManagementObject computerSystem = GetComputerSystem(computerName)) { object isInDomain = computerSystem.Properties["PartOfDomain"].Value; if (isInDomain == null) return null; if(!(bool)isInDomain) return null; return computerSystem.Properties["Domain"].Value.ToString(); } } } </code></pre> <p>The only thing I can find in WinAPI is the NetGetJoinInformation method, which returns the NetBIOS domain name:</p> <pre><code>using System.Runtime.InteropServices; public class PInvoke { public const int NERR_SUCCESS = 0; public enum NETSETUP_JOIN_STATUS { NetSetupUnknownStatus = 0, NetSetupUnjoined, NetSetupWorkgroupName, NetSetupDomainName } [DllImport("netapi32.dll", CharSet = CharSet.Unicode)] protected static extern int NetGetJoinInformation(string lpServer, out IntPtr lpNameBuffer, out NETSETUP_JOIN_STATUS BufferType); [DllImport("netapi32.dll", SetLastError = true)] protected static extern int NetApiBufferFree(IntPtr Buffer); public static NETSETUP_JOIN_STATUS GetComputerJoinInfo(string computerName, out string name) { IntPtr pBuffer; NETSETUP_JOIN_STATUS type; int lastError = NetGetJoinInformation(computerName, out pBuffer, out type); if(lastError != NERR_SUCCESS) { throw new System.ComponentModel.Win32Exception(lastError); } try { if(pBuffer == IntPtr.Zero) { name = null; } else { switch(type) { case NETSETUP_JOIN_STATUS.NetSetupUnknownStatus: case NETSETUP_JOIN_STATUS.NetSetupUnjoined: { name = null; break; } default: { name = Marshal.PtrToStringUni(pBuffer); break; } } } return type; } finally { if(pBuffer != IntPtr.Zero) { NetApiBufferFree(pBuffer); } } } } </code></pre>
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    1. COSo you don't want to resolve the name but rather get the name of the domain the computer is a member of, did I get that right? I.e. the suffix that gets appended to the DNS name when that machine performs dynamic DNS registration of itself?!
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    2. CO@STATUS_ACCESS_DENIED Right, the domain that the computer is a member of. I edited the question to try to make that clearer.
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      1. USSean Hall
 

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