How do you programmatically determine whether a Windows computer is a member of a domain?

Question

I need a way to determine whether the computer running my program is joined to any domain. It doesn\'t matter what specific domain it is part of, just whether it is connecte

Answer 1

The code in the MSDN sample is a little outdated. This is the function I came up with that works.

bool ComputerBelongsToDomain()
{
    bool ret = false;

    LSA_OBJECT_ATTRIBUTES objectAttributes;
    LSA_HANDLE policyHandle;
    NTSTATUS status;
    PPOLICY_PRIMARY_DOMAIN_INFO info;

    // Object attributes are reserved, so initialize to zeros.
    ZeroMemory(&objectAttributes, sizeof(objectAttributes));

    status = LsaOpenPolicy(NULL, &objectAttributes, GENERIC_READ | POLICY_VIEW_LOCAL_INFORMATION, &policyHandle);
    if (!status)
    {
        status = LsaQueryInformationPolicy(policyHandle, PolicyPrimaryDomainInformation, (LPVOID*)&info);
        if (!status)
        {
            if (info->Sid)
                ret = true;

            LsaFreeMemory(info);
        }

        LsaClose(policyHandle);
    }

    return ret;
}