Question

我正在尝试通过使用以下代码进行模拟来从IIS（WCF应用程序）打印pdf文档来访问网络打印机。由于我的wcf应用程序在“LocalSystem”应用程序池标识下运行，我需要进行模拟。

      [PermissionSet(SecurityAction.Demand, Name = "FullTrust")]
      public class Impersonation : IDisposable
      {

        private readonly SafeTokenHandle _handle;
        private readonly WindowsImpersonationContext _context;
    bool disposed = false;

    // constants from winbase.h
    const int LOGON32_LOGON_INTERACTIVE = 2;
    const int LOGON32_LOGON_NETWORK = 3;
    const int LOGON32_LOGON_BATCH = 4;
    const int LOGON32_LOGON_SERVICE = 5;
    const int LOGON32_LOGON_UNLOCK = 7;
    const int LOGON32_LOGON_NETWORK_CLEARTEXT = 8;
    const int LOGON32_LOGON_NEW_CREDENTIALS = 9;

    const int LOGON32_PROVIDER_DEFAULT = 0;
    const int LOGON32_PROVIDER_WINNT35 = 1;
    const int LOGON32_PROVIDER_WINNT40 = 2;
    const int LOGON32_PROVIDER_WINNT50 = 3;

    public Impersonation(ImpersonateUserDetails user) : this(user.Domain, user.UserName, user.Password)
    { }
    public Impersonation(string domain, string username, string password)
    {
        // if domain name was blank, assume local machine
        if (string.IsNullOrEmpty(domain))
            domain = System.Environment.MachineName;

        var ok = LogonUser(username, domain, password,
                       LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT, out this._handle);
        if (!ok)
        {
            var errorCode = Marshal.GetLastWin32Error();
            throw new ApplicationException(string.Format("Could not impersonate the elevated user.  LogonUser returned error code {0}.", errorCode));
        }

        this._context = WindowsIdentity.Impersonate(this._handle.DangerousGetHandle());
    }

    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }

    protected virtual void Dispose(bool disposing)
    {
        if (disposed)
            return;

        if (disposing)
        {
            this._context.Dispose();
            this._handle.Dispose();
        }           
        disposed = true;
    }

    ~Impersonation()
    {
        Dispose(false);
    }


    [DllImport("advapi32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
    private static extern bool LogonUser(String lpszUsername, String lpszDomain, String lpszPassword, int dwLogonType, int dwLogonProvider, out SafeTokenHandle phToken);

    sealed class SafeTokenHandle : SafeHandleZeroOrMinusOneIsInvalid
    {
        private SafeTokenHandle()
            : base(true) { }

        [DllImport("kernel32.dll")]
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
        [SuppressUnmanagedCodeSecurity]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool CloseHandle(IntPtr handle);

        protected override bool ReleaseHandle()
        {
            return CloseHandle(handle);
        }
    }
}

public class ImpersonateUserDetails
{
    public string UserName { get; set; }

    public string Password { get; set; }

    public string Domain { get; set; }
}

但是虽然我可以列出网络打印机，但打印不适用于此模拟，但是当我将文档发送到打印机时它不会打印。它在打印队列中显示大小为空。请问任何想法???

以下是微软的打印代码，我在模仿时调用： https://msdn.microsoft.com/en-us/library/system.drawing.printing.printdocument.print(v=vs.110).aspx

代码示例：

using (new Impersonation(domain, username, password)) 
{ 
  //printing code goes here.
}

无法在Windows Server 2012 R2中使用模拟通过IIS进行打印

0 个答案: