C# Signature:
public enum ExtendedNameFormat
{
/// <summary>
/// An unknown name type.
/// </summary>
NameUnknown = 0,
/// <summary>
/// The fully qualified distinguished name
/// (for example, CN=Jeff Smith,OU=Users,DC=Engineering,DC=Microsoft,DC=Com).
/// </summary>
NameFullyQualifiedDN = 1,
/// <summary>
/// A legacy account name (for example, Engineering\JSmith).
/// The domain-only version includes trailing backslashes (\\).
/// </summary>
NameSamCompatible = 2,
/// <summary>
/// A "friendly" display name (for example, Jeff Smith).
/// The display name is not necessarily the defining relative distinguished name (RDN).
/// </summary>
NameDisplay = 3,
/// <summary>
/// A GUID string that the IIDFromString function returns
/// (for example, {4fa050f0-f561-11cf-bdd9-00aa003a77b6}).
/// </summary>
NameUniqueId = 6,
/// <summary>
/// The complete canonical name (for example, engineering.microsoft.com/software/someone).
/// The domain-only version includes a trailing forward slash (/).
/// </summary>
NameCanonical = 7,
/// <summary>
/// The user principal name (for example, someone@example.com).
/// </summary>
NameUserPrincipal = 8,
/// <summary>
/// The same as NameCanonical except that the rightmost forward slash (/)
/// is replaced with a new line character (\n), even in a domain-only case
/// (for example, engineering.microsoft.com/software\nJSmith).
/// </summary>
NameCanonicalEx = 9,
/// <summary>
/// The generalized service principal name
/// (for example, www/www.microsoft.com@microsoft.com).
/// </summary>
NameServicePrincipal = 10,
/// <summary>
/// The DNS domain name followed by a backward-slash and the SAM user name.
/// </summary>
NameDnsDomain = 12
}
[DllImport("secur32.dll", CharSet=CharSet.Auto, SetLastError=true)]
public static extern int GetUserNameEx (ExtendedNameFormat nameFormat,
StringBuilder userName, ref int userNameSize);
VB Signature:
Declare Function GetUserNameEx Lib "secur32.dll" (nameFormat As Integer, _
userName As StringBuilder, ByRef userNameSize As Integer) As Integer
User-Defined Types:
None.
Notes:
This may be required because System.Environment.UserDomainName is broken. If the local machine has a user account that is the same name as a logged in domain user (machineName\bob & domainName\bob) UserDomainName returns the machine name, not the domain name.
Tips & Tricks:
Please add some!
Sample Code:
public class Sample
{
enum EXTENDED_NAME_FORMAT
{
NameUnknown = 0,
NameFullyQualifiedDN = 1,
NameSamCompatible = 2,
NameDisplay = 3,
NameUniqueId = 6,
NameCanonical = 7,
NameUserPrincipal = 8,
NameCanonicalEx = 9,
NameServicePrincipal = 10,
NameDnsDomain = 12
}
[DllImport("secur32.dll", CharSet=CharSet.Auto)]
public static extern int GetUserNameEx (int nameFormat, StringBuilder userName, ref int userNameSize);
public String GetUserDomain()
{
if (Environment.OSVersion.Platform != PlatformID.Win32NT)
return null;
StringBuilder userName = new StringBuilder(1024);
int userNameSize = userName.Capacity;
if(0 != GetUserNameEx((int)EXTENDED_NAME_FORMAT.NameSamCompatible, userName, ref userNameSize))
{
string[] nameParts = userName.ToString().Split('\\');
if (2 != nameParts.Length) return null;
return nameParts[0];
}
return null;
}
}
VB
public class Sample
Declare Function GetUserNameExA Lib "secur32.dll" (ByVal nameFormat As Integer, _
ByVal userName As System.Text.StringBuilder, ByRef userNameSize As Integer) As Integer
' GetUserNameExA for ANSI
' GetUserNameExW for UNICODE
Public Enum EXTENDED_NAME_FORMAT
NameUnknown = 0
NameFullyQualifiedDN = 1
NameSamCompatible = 2
NameDisplay = 3
NameUniqueId = 6
NameCanonical = 7
NameUserPrincipal = 8
NameCanonicalEx = 9
NameServicePrincipal = 10
NameDnsDomain = 12
End Enum
Public Function GetUserName() As String
Dim UserName As New System.Text.StringBuilder(1024)
Dim userNameSize As Integer = UserName.Capacity
If Environment.OSVersion.Platform <> PlatformID.Win32NT Then
Return ""
End If
If GetUserNameExA(EXTENDED_NAME_FORMAT.NameSamCompatible, UserName, userNameSize) <> 0 Then
Dim NameParts() As String = UserName.ToString().Split("\")
If NameParts.Length <> 2 Then
Return ""
End If
Return NameParts(1)
Else
Return ""
End If
End Function
End Class
Alternative Managed API:
System.Environment.UserDomainName
