Question

我有通过IIS中托管的应用程序将pdf（从流生成）打印到网络打印机的方案。我尝试使用PrintDocument.Print（），我面临的问题是：1。文档排队到大小为0字节的打印作业队列。 2.文档正在排队到打印作业队列，其所有者名称为machine_name。这是我尝试使用PdfiumViewer（从bytearray生成PrintDocument）和System.Drawing.Printing.PrintDocument的代码：

 public void SendPdfToPrinter(byte[] byteArray, string fileName, string printerNetworkPath)
    {
        using (Stream fileStream = new MemoryStream(byteArray)) //byte array for the file content
        {

            var printerSettings = new System.Drawing.Printing.PrinterSettings
            {
                PrinterName = printerNetworkPath, //this is the printer full name. i.e. \\10.10.0.12\ABC-XEROX-01
                PrintFileName = fileName, //file name. i.e. abc.pdf
                PrintRange = System.Drawing.Printing.PrintRange.AllPages,
            };
            printerSettings.DefaultPageSettings.Margins = new System.Drawing.Printing.Margins(0, 0, 0, 0);

            // Now print the PDF document
            using (PdfiumViewer.PdfDocument document = PdfiumViewer.PdfDocument.Load(fileStream))
            {
                using (System.Drawing.Printing.PrintDocument printDocument = document.CreatePrintDocument())
                {
                    printDocument.DocumentName = fileName;
                    printDocument.PrinterSettings = printerSettings;
                    printDocument.PrintController = new System.Drawing.Printing.StandardPrintController();
                    printDocument.Print();
                }
            }

Answer 1

对于这两个问题，答案是模仿用户进行打印。

在我的情况下，应用程序池在LocalSystem帐户下运行，该帐户显然不是域用户，打印机仅向域用户公开。

注意：应用程序池是64位，如果你使用32位，你将面临另一组挑战，这里有很好的描述： https://blogs.msdn.microsoft.com/winsdk/2015/05/19/printing-successfully-using-impersonation-from-a-32-bit-application-on-a-64-bit-system/

以下是为域用户进行模拟所需的代码：

 [PermissionSet(SecurityAction.Demand, Name = "FullTrust")]
public class Impersonation : IDisposable
{
    private readonly SafeTokenHandle _handle;
    private readonly WindowsImpersonationContext _context;
    bool disposed = false;

    const int LOGON32_PROVIDER_DEFAULT = 0;
    const int LOGON32_LOGON_INTERACTIVE = 2;

    public Impersonation(ImpersonateUserDetails user) : this(user.Domain, user.UserName, user.Password)
    { }
    public Impersonation(string domain, string username, string password)
    {
        var ok = LogonUser(username, domain, password,
                       LOGON32_LOGON_INTERACTIVE, 0, 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; }
}

Answer 2

另一种可能的＆amp;简单的解决方案是将您的应用程序池标识配置给具有访问/允许在网络打印机中打印的自定义/域用户。

如何通过IIS中托管的应用程序打印到网络打印机

2 个答案: