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NetWkstaUserEnum (netapi32)
.
C# Signature:
[DllImport("netapi32.dll", CharSet = CharSet.Unicode, SetLastError=true)]
static extern int NetWkstaUserEnum(
string servername,
int level,
out IntPtr bufptr,
int prefmaxlen,
out int entriesread,
out int totalentries,
ref int resume_handle);
Shared Function NetWkstaUserEnum(ByVal servername As String, ByVal level As Integer, <System.Runtime.InteropServices.Out()> ByRef bufptr As IntPtr, ByVal prefmaxlen As Integer, <System.Runtime.InteropServices.Out()> ByRef entriesread As Integer, <System.Runtime.InteropServices.Out()> ByRef totalentries As Integer, ByRef resume_handle As Integer) As Integer
End Function
Declare Function NetWkstaUserEnum Lib "netapi32.dll" (TODO) As TODO
User-Defined Types:
See sample code for types and constants.
Alternative Managed API:
WMI can do this sort of thing (the System.Management namespace in .Net 2.0)
Notes:
If you want to find the user logged in to the workstation, consider instead a WMI query ("select UserName from Win32_ComputerSystem"), which has certain advantages (runs faster, less ambigious results, doesn't require Interop if using .Net 2.0 System.Management namespace, etc.)
Tips & Tricks:
Please add some!
* On Windows 8+ when users log in with a MicrosoftAccount the username is returned like "MicrosoftAccount\user.email@thedomain.com" rather than the ID. This means for example that it won't match their directory name in C:\Users.
Sample Code:
class NetWorkstationUserEnum
{
[DllImport("netapi32.dll", CharSet = CharSet.Unicode, SetLastError=true)]
static extern int NetWkstaUserEnum(
string servername,
int level,
out IntPtr bufptr,
int prefmaxlen,
out int entriesread,
out int totalentries,
ref int resume_handle);
[DllImport("netapi32.dll")]
static extern int NetApiBufferFree(
IntPtr Buffer);
const int NERR_SUCCESS = 0;
const int ERROR_MORE_DATA = 234;
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct WKSTA_USER_INFO_0
{
public string wkui0_username;
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct WKSTA_USER_INFO_1
{
public string wkui1_username;
public string wkui1_logon_domain;
public string wkui1_oth_domains;
public string wkui1_logon_server;
}
void ScanHost(string hostName)
{
IntPtr bufptr = IntPtr.Zero;
int dwEntriesread;
int dwTotalentries = 0;
int dwResumehandle = 0;
int nStatus;
Type tWui1 = typeof(WKSTA_USER_INFO_1);
int nStructSize = Marshal.SizeOf(tWui1);
WKSTA_USER_INFO_1 wui1;
//this.listView1.Items.Clear();
do
{
nStatus = NetWkstaUserEnum(
hostName,
1,
out bufptr,
32768,
out dwEntriesread,
out dwTotalentries,
ref dwResumehandle);
//
// If the call succeeds,
//
if ((nStatus == NERR_SUCCESS) | (nStatus == ERROR_MORE_DATA))
{
if (dwEntriesread > 0)
{
IntPtr pstruct = bufptr;
//
// Loop through the entries.
//
for (int i = 0; i < dwEntriesread; i++)
{
wui1 = (WKSTA_USER_INFO_1)Marshal.PtrToStructure(pstruct, tWui1);
Console.WriteLine(wui1.wkui1_logon_domain + "\\" + wui1.wkui1_username);
pstruct = (IntPtr)((int)pstruct + nStructSize);
}
}
else
{
Console.WriteLine("A system error has occurred : " + nStatus);
}
}
if (bufptr != IntPtr.Zero)
NetApiBufferFree(bufptr);
} while (nStatus == ERROR_MORE_DATA);
}
static public void Main(string[] args)
{
string host = Environment.MachineName;
if (args.Length > 0)
{
host = args[0];
}
NetWorkstationUserEnum nws = new NetWorkstationUserEnum();
nws.ScanHost(host);
}
}
The NetWkstaUserEnum function lists information about all users currently logged on to the workstation. This list includes interactive, service and batch logons.
10/13/2015 4:58:02 AM - -69.60.207.16
Click to read this page
4/6/2008 7:23:14 AM - anonymous
Click to read this page
4/6/2008 7:23:14 AM - anonymous
The SetLastError API
1/26/2016 3:27:33 AM - -124.148.167.58
ByVal is a VB keyword that specifies a variable to be passed as a parameter BY VALUE. In other words, if the function or sub changes the value of the internal variable, it does not change the value of the external variable that was passed to it.
4/25/2007 3:19:55 AM - josep1er@cmich.edu-141.209.229.179
ByVal is a VB keyword that specifies a variable to be passed as a parameter BY VALUE. In other words, if the function or sub changes the value of the internal variable, it does not change the value of the external variable that was passed to it.
4/25/2007 3:19:55 AM - josep1er@cmich.edu-141.209.229.179
ByRef is a VB keyword that specifies a variable to be passed as a parameter BY REFERENCE. In other words, the pointer to the variable is passed and any change to its value made within the function or sub will change its value outside the function/sub.
4/25/2007 3:19:29 AM - anonymous
An IntPtr is a pointer to a memory location (unmanaged) that adapts to the platform it is running on (64-bit, etc.) UNLIKE a standard int/Integer. You should always use this type for unmanaged calls that require it, even though an int will appear to work on your development machine.
1/13/2008 4:00:13 AM - Damon Carr-72.43.165.29
ByVal is a VB keyword that specifies a variable to be passed as a parameter BY VALUE. In other words, if the function or sub changes the value of the internal variable, it does not change the value of the external variable that was passed to it.
4/25/2007 3:19:55 AM - josep1er@cmich.edu-141.209.229.179
ByRef is a VB keyword that specifies a variable to be passed as a parameter BY REFERENCE. In other words, the pointer to the variable is passed and any change to its value made within the function or sub will change its value outside the function/sub.
4/25/2007 3:19:29 AM - anonymous
ByRef is a VB keyword that specifies a variable to be passed as a parameter BY REFERENCE. In other words, the pointer to the variable is passed and any change to its value made within the function or sub will change its value outside the function/sub.
4/25/2007 3:19:29 AM - anonymous
ByRef is a VB keyword that specifies a variable to be passed as a parameter BY REFERENCE. In other words, the pointer to the variable is passed and any change to its value made within the function or sub will change its value outside the function/sub.
4/25/2007 3:19:29 AM - anonymous
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