File.Move and File.Copy gives IOException Logon failure

Question

I'm writing an add-in for a fujitsu scanner in C#. Documents are scanned to a local directory, and I wanted to copy them to a pc on the network. I keep getting System.IO.IOException: Logon failure: unknown user name or bad password though. I tried copying them to a public directory (at least I think its public), and I still get the same result.

Any ideas for stuff I could try? I don't think my code here is the issue, but here it is anyway.

private bool moveTheFile(String source, String destination)
    {
        System.DirectoryServices.DirectoryEntry dntry = null;
        try
        {
            //System.IO.File.Move(source, destination);
            System.IO.File.Copy(source, destination);
            System.IO.File.Delete(source);
            if (System.IO.File.Exists(destination))
            {
                return true;
            }
            else
            {
                return false;
            }
        }
        catch (Exception err)
        {
            _host.WriteSystemLog(LogType.Information, "E1000099", "File.Move Error " + err.ToString());
            return false;
        }
    }

Answer 1

Your problem is due to the fact that the machine is using a LOCAL SERVICE account or something that does not have access even to the shared public folder. You need to impersonate a different account I believe. I found the following code on a different site to do this:

public WindowsImpersonationContext 
    ImpersonateUser(string sUsername, string sDomain, string sPassword)
{
    // initialize tokens
    IntPtr pExistingTokenHandle = new IntPtr(0);
    IntPtr pDuplicateTokenHandle = new IntPtr(0);
    pExistingTokenHandle = IntPtr.Zero;
    pDuplicateTokenHandle = IntPtr.Zero;

    // if domain name was blank, assume local machine
    if (sDomain == "")
        sDomain = System.Environment.MachineName;
    try
    {
        string sResult = null;
        const int LOGON32_PROVIDER_DEFAULT = 0;
        // create token
        const int LOGON32_LOGON_INTERACTIVE = 2;
        //const int SecurityImpersonation = 2;
        // get handle to token
        bool bImpersonated = LogonUser(sUsername, sDomain, sPassword, 
            LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT, 
                ref pExistingTokenHandle);
        // did impersonation fail?
        if (false == bImpersonated)
        {
            int nErrorCode = Marshal.GetLastWin32Error();
            sResult = "LogonUser() failed with error code: " + 
                nErrorCode + "\r\n";
            // show the reason why LogonUser failed
            MessageBox.Show(this, sResult, "Error", 
                MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
        // Get identity before impersonation
        sResult += "Before impersonation: " + 
            WindowsIdentity.GetCurrent().Name + "\r\n";
        bool bRetVal = DuplicateToken(pExistingTokenHandle, 
            (int)SECURITY_IMPERSONATION_LEVEL.SecurityImpersonation, 
                ref pDuplicateTokenHandle);
        // did DuplicateToken fail?
        if (false == bRetVal)
        {
            int nErrorCode = Marshal.GetLastWin32Error();
            // close existing handle
            CloseHandle(pExistingTokenHandle); 
            sResult += "DuplicateToken() failed with error code: " 
                + nErrorCode + "\r\n";
            // show the reason why DuplicateToken failed
            MessageBox.Show(this, sResult, "Error", 
                MessageBoxButtons.OK, MessageBoxIcon.Error);
            return null;
        }
        else
        {
            // create new identity using new primary token
            WindowsIdentity newId = new WindowsIdentity
                                        (pDuplicateTokenHandle);
            WindowsImpersonationContext impersonatedUser = 
                                        newId.Impersonate();
            // check the identity after impersonation
            sResult += "After impersonation: " + 
                WindowsIdentity.GetCurrent().Name + "\r\n";

            MessageBox.Show(this, sResult, "Success", 
                MessageBoxButtons.OK, MessageBoxIcon.Information);
            return impersonatedUser;
        }
    }
    catch (Exception ex)
    {
        throw ex;
    }
    finally
    {
        // close handle(s)
        if (pExistingTokenHandle != IntPtr.Zero)
            CloseHandle(pExistingTokenHandle);
        if (pDuplicateTokenHandle != IntPtr.Zero) 
            CloseHandle(pDuplicateTokenHandle);
    }
}

Here are the supporting methods:

[DllImport("advapi32.dll", SetLastError=true)]
        public static extern bool LogonUser(string pszUsername, string pszDomain, string pszPassword, 
            int dwLogonType, int dwLogonProvider, ref IntPtr phToken);

        // closes open handes returned by LogonUser
        [DllImport("kernel32.dll", CharSet=CharSet.Auto)]
        public extern static bool CloseHandle(IntPtr handle);

        // creates duplicate token handle
        [DllImport("advapi32.dll", CharSet=CharSet.Auto, SetLastError=true)]
        public extern static bool DuplicateToken(IntPtr ExistingTokenHandle, 
            int SECURITY_IMPERSONATION_LEVEL, ref IntPtr DuplicateTokenHandle);
// group type enum
    public enum SECURITY_IMPERSONATION_LEVEL : int
    {
        SecurityAnonymous = 0,
        SecurityIdentification = 1,
        SecurityImpersonation = 2,
        SecurityDelegation = 3
    }