How to get the current username and password from the Windows operating system.

Question

Story: I have a motherboard CD provided by the original Intel motherboard. When I install the drivers, it asks for the username and password of the administrator account.

After installing each driver, the system reboots and does not ask for a username and password.

My idea is that Windows should have a way to validate and enter a username and password

Could you let me know how to do this in C #, thanks.

Answer 1

I think this article can help you.

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1: .

: Windows shoud

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using System.Security.Principal;
using System.Security.Permissions;
using System.Runtime.InteropServices;

:

namespace WindowsAccount
{
    public partial class Form1 : Form
    {

        [DllImport("advapi32.dll", SetLastError = true)]
        public static extern bool LogonUser(string lpszUsername,
            string lpszDomain,
            string lpszPassword,
            int dwLogonType,
            int dwLogonProvider,
            out IntPtr phToken
            );

        [DllImport("kernel32.dll")]
        public static extern int FormatMessage(int dwFlags, ref IntPtr lpSource, int dwMessageId, int dwLanguageId, ref String lpBuffer, int nSize, ref IntPtr Arguments);

        [DllImport("kernel32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        static extern bool CloseHandle(IntPtr hObject);


        public static string GetErrorMessage(int errorCode)
        {
            int FORMAT_MESSAGE_ALLOCATE_BUFFER = 0x100;
            int FORMAT_MESSAGE_IGNORE_INSERTS = 0x200;
            int FORMAT_MESSAGE_FROM_SYSTEM = 0x1000;

            int msgSize = 255;
            string lpMsgBuf = null;
            int dwFlags = FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS;

            IntPtr lpSource = IntPtr.Zero;
            IntPtr lpArguments = IntPtr.Zero;
            int returnVal = FormatMessage(dwFlags, ref lpSource, errorCode, 0, ref lpMsgBuf, msgSize, ref lpArguments);

            if (returnVal == 0)
            {
                throw new Exception("Failed to format message for error code " + errorCode.ToString() + ". ");
            }
            return lpMsgBuf;

        }


        public Form1()
        {
            InitializeComponent();
        }

        private void btnLogin_Click(object sender, EventArgs e)
        {
            IntPtr tokenHandle = new IntPtr(0);

            try
            {
                string UserName = null;
                string MachineName = null;
                string Pwd = null;

                //The MachineName property gets the name of your computer.
                MachineName = System.Environment.MachineName;
                UserName = txtUser.Text;
                Pwd = txtPass.Text;

                const int LOGON32_PROVIDER_DEFAULT = 0;
                const int LOGON32_LOGON_INTERACTIVE = 2;
                tokenHandle = IntPtr.Zero;

                //Call the LogonUser function to obtain a handle to an access token.
                bool returnValue = LogonUser(UserName, MachineName, Pwd, LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT, out tokenHandle);

                if (returnValue == false)
                {
                    //This function returns the error code that the last unmanaged function returned.
                    int ret = Marshal.GetLastWin32Error();
                    string errmsg = GetErrorMessage(ret);
                    MessageBox.Show(errmsg);
                }
                else
                {
                    //Create the WindowsIdentity object for the Windows user account that is
                    //represented by the tokenHandle token.

                    WindowsIdentity newId = new WindowsIdentity(tokenHandle);
                    WindowsPrincipal userperm = new WindowsPrincipal(newId);

                    //Verify whether the Windows user has administrative credentials.
                    if (userperm.IsInRole(WindowsBuiltInRole.Administrator))
                    {
                        MessageBox.Show("Access Granted. User is admin");
                    }
                    else
                    {
                        MessageBox.Show("Access Granted. User is not admin");
                    }
                }

                CloseHandle(tokenHandle);
            }
            catch (Exception ex)
            {
                MessageBox.Show("Exception occurred. " + ex.Message);
            }

        }
    }
}

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Answer 2

, . . http://support.microsoft.com/kb/315231

Answer 3

You can find out your username by going to the command line and typing:

C:\ >set USERNAME

and he will print something like

USERNAME=Administrator

what is your username.

I am sure that your password is empty / empty, because otherwise it will tell you.