How to get DNS DNS suffix search list using C ++

Question

How to get windows dns DNS suffix list from ip configuration using C ++? (.NET <= 3.5)

Answer 1

You can get them from the registry.

If installed from the network control panel:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Tcpip\Parameters\SearchList 

If set by Group Policy:

 HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\DNSClient\SearchList 

Use the registry class for reading , the same class can be used, but for this you will need administrator permissions.

C # using management classes and WMI:

 ManagementObjectSearcher q= new ManagementObjectSearcher("SELECT ServiceName,DNSDomainSuffixSearchOrder FROM Win32_NetworkAdapterConfiguration");// WHERE DNSDomainSuffixSearchOrder IS NOT NULL"); var qc= q.Get(); foreach (ManagementObject mo in qc) { if ( mo.Properties["DNSDomainSuffixSearchOrder"] != null) { var s = mo.Properties["DNSDomainSuffixSearchOrder"]; if (s.Value != null) { Console.WriteLine(mo["ServiceName"]); string[] sfxNames = s.Value as string[]; foreach (string sx in sfxNames) { Console.WriteLine(sx); } } } }