枚举当前系统用户（使用NetUserEnum API枚举）

using System.Runtime.InteropServices;

 

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]

public struct USER_INFO_0

{

    public string Username;

}

 

[DllImport("Netapi32.dll")]

extern static int NetUserEnum(

    [MarshalAs(UnmanagedType.LPWStr)]

    string servername,

    int level,

    int filter,

    out IntPtr bufptr,

    int prefmaxlen,

    out int entriesread,

    out int totalentries,

    out int resume_handle);

 

[DllImport("Netapi32.dll")]

extern static int NetApiBufferFree(IntPtr Buffer);

 

private void button1_Click(object sender, EventArgs e)

{

    int EntriesRead;

    int TotalEntries;

    int Resume;

    IntPtr bufPtr;

 

    NetUserEnum(null, 0, 2, out bufPtr, -1, out EntriesRead,

        out TotalEntries, out Resume);

    if (EntriesRead > 0)

    {

        USER_INFO_0[] Users = new USER_INFO_0[EntriesRead];

        IntPtr iter = bufPtr;

        for (int i = 0; i < EntriesRead; i++)

        {

            Users[i] = (USER_INFO_0)Marshal.PtrToStructure(iter,

                typeof(USER_INFO_0));

            iter = (IntPtr)((int)iter + Marshal.SizeOf(typeof(USER_INFO_0)));

            textBox1.AppendText(Users[i].Username + "/r/n");

        }

        NetApiBufferFree(bufPtr);

    }

}

http://blog.csdn.net/zswang/article/details/1576495