API for Detecting Windows Active Directory name/IP

I have a requirement to detect all users from local and Active Directory(if present) in Windows.

I have found that C API: NetQueryDisplayInformation() has also the option to retrieve the information from a "serverName", which is开发者_如何学运维 presumably an Active Directory which can be queried.

But how do I find out if ActiveDirectory is available/ and it's name ? Thanks.

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This information is available in WMI. In the Win32_ComputerSystem class (there will be a single instance per computer) has a Domain property containing the domain's name.

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Another way of finding out domain name (if present) is to use WIN API ::DsGetDcName() This one returns information about Active Dir server name in DOMAIN_CONTROLLER_INFO struct. You get there all the domain information you need. Much sympler than using WMI :-)