从打印机本地端口获取数据

Question

我用一些示例代码做了一个虚拟打印机。但是我不知道如何在它开始打印时从中获取数据。

当它开始打印时它给出打印错误的通知。为什么有“C:/MyLocalPort.txt”.

任何人都可以帮助我获取此虚拟打印机设置为打印的数据。

示例代码如下：

using System;
using System.Windows.Forms;
using System.Diagnostics;
using System.Net;
using System.Net.Sockets;
using System.Runtime.InteropServices;
using System.Management;

namespace virtualPrinter
{
    public static class PrinterClass // class which carries SetDefaultPrinter function
    {
        [DllImport("winspool.drv", CharSet = CharSet.Auto, SetLastError = true)]
        public static extern bool SetDefaultPrinter(string Printer);
    }

    class myPrinterClass
    {
       public static void getPrinterNames()
        {
            foreach (string printer in System.Drawing.Printing.PrinterSettings.InstalledPrinters)
            {
                MessageBox.Show(printer);
            }
        }
        public static void installPrinter(string printerName) //works on win 7,8,8.1,10 on both x84 and x64
        {
            Winspool.AddLocalPort(@"C:\MyLocalPort.txt");

            //https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/rundll32-printui
            //  /if         Installs a printer by using an .inf file.
            //  /b[name]    Specifies the base printer name.
            //  /@[file]    Specifies a command-line argument file and directly inserts the text in that file into the command line.
            //  /f[file]    Species the Universal Naming Convention (UNC) path and name of the .inf file name or the output file name, depending on the task that you are performing. Use /F[file] to specify a dependent .inf file.
            //  /r[port]    Specifies the port name.
            //  /m[model]   Specifies the driver model name. (This value can be specified in the .inf file.)

            string arg;
            arg = "printui.dll , PrintUIEntry /if /b " + "\"" + printerName + "\"" + @" /f C:\Windows\inf\ntprint.inf /r " + "\"" + @"C:\MyLocalPort.txt" + "\"" + " /m " + "\"" + "Generic / Text Only" + "\""; //initial arg
            ProcessStartInfo p = new ProcessStartInfo();
            p.FileName = "rundll32.exe";
            p.Arguments = arg;
            p.WindowStyle = ProcessWindowStyle.Hidden;

            try
            {
                Process.Start(p);
                MessageBox.Show(printerName + " installed succesfully!");
            }

            catch (Exception ex)
            {
                MessageBox.Show("Something went wrong. Try again!" );
            }
        }
        public static bool printerExists(string printerName)
        {
            bool res = false;
            foreach (string printer in System.Drawing.Printing.PrinterSettings.InstalledPrinters)
            {
                if (printer == printerName)
                {
                    res = true;
                }
            }
            return res;
        }
        public static void uninstallPrinter(string printerName)
        {
            string arg;
            ProcessStartInfo p = new ProcessStartInfo();
            arg = "printui.dll, PrintUIEntry /dl /n " + "\"" + printerName + "\"";
            if (printerExists(printerName))
            {
                p.FileName = "rundll32.exe";
                p.Arguments = arg;
                p.WindowStyle = ProcessWindowStyle.Hidden;
                try
                {
                    Process.Start(p);
                    MessageBox.Show(printerName + " unistalled successfully");
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.InnerException.ToString());
                }
                p = null;
            }
        }
       
        public static string GetLocalIPAddress() //erxomeno feature
        {
            var host = Dns.GetHostEntry(Dns.GetHostName());
            foreach (var ip in host.AddressList)
            {
                if (ip.AddressFamily == AddressFamily.InterNetwork)
                {
                    return ip.ToString();
                }
            }
            throw new Exception("No network adapters with an IPv4 address in the system!");
        }

        public static class Winspool
        {
            [StructLayout(LayoutKind.Sequential)]
            private class PRINTER_DEFAULTS
            {
                public string pDatatype;
                public IntPtr pDevMode;
                public int DesiredAccess;
            }

            [DllImport("winspool.drv", EntryPoint = "XcvDataW", SetLastError = true)]
            private static extern bool XcvData(
                IntPtr hXcv,
                [MarshalAs(UnmanagedType.LPWStr)] string pszDataName,
                IntPtr pInputData,
                uint cbInputData,
                IntPtr pOutputData,
                uint cbOutputData,
                out uint pcbOutputNeeded,
                out uint pwdStatus);

            [DllImport("winspool.drv", EntryPoint = "OpenPrinterA", SetLastError = true)]
            private static extern int OpenPrinter(
                string pPrinterName,
                ref IntPtr phPrinter,
                PRINTER_DEFAULTS pDefault);

            [DllImport("winspool.drv", EntryPoint = "ClosePrinter")]
            private static extern int ClosePrinter(IntPtr hPrinter);

            public static int AddLocalPort(string portName)
            {
                PRINTER_DEFAULTS def = new PRINTER_DEFAULTS();

                def.pDatatype = null;
                def.pDevMode = IntPtr.Zero;
                def.DesiredAccess = 1; //Server Access Administer

                IntPtr hPrinter = IntPtr.Zero;

                int n = OpenPrinter(",XcvMonitor Local Port", ref hPrinter, def);
                if (n == 0)
                    return Marshal.GetLastWin32Error();

                if (!portName.EndsWith("[=10=]"))
                    portName += "[=10=]"; // Must be a null terminated string

                // Must get the size in bytes. Rememeber .NET strings are formed by 2-byte characters
                uint size = (uint)(portName.Length * 2);

                // Alloc memory in HGlobal to set the portName
                IntPtr portPtr = Marshal.AllocHGlobal((int)size);
                Marshal.Copy(portName.ToCharArray(), 0, portPtr, portName.Length);

                uint needed; // Not that needed in fact...
                uint xcvResult; // Will receive de result here

                XcvData(hPrinter, "AddPort", portPtr, size, IntPtr.Zero, 0, out needed, out xcvResult);

                ClosePrinter(hPrinter);
                Marshal.FreeHGlobal(portPtr);

                return (int)xcvResult;
            }
        }

    }
}

Answer 1

好的，我不能那样做。首先，我必须创建一个我用过的端口监视器 mfilemon.dll 然后我用那个端口监视器创建了一个端口然后将所有驱动程序文件粘贴到系统驱动程序字典中。然后最后添加打印机并完成。你可以参考这个 https://github.com/Gohulan/Virtual-Printer/blob/main/PrinterSetup/SpoolerHelper.cs 这包含创建虚拟打印机以打印到 pdf 虚拟打印机的所有步骤

从打印机本地端口获取数据

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