打印“原始文本” (ZPL) 来自网络

Question

我们有很多旧的 ZPL 标签。

我们希望能够从网络客户端打印它们。打印机连接到客户端而不是服务器。

我们有一些想法：

1. 从 Silverlight 打印。不可行。似乎无法在不调用 COM 对象的情况下从 .NET 向 Zebra 打印“原始”内容，而这在普通 Silverlight 中是不可能的。

2. 从 Silverlight 中，将 ZPL 视为文件并将其文件复制到打印机。本地打印机必须设置为共享。可以在浏览器外的 Silverlight 中以更高的信任度工作。但如果可能的话，我们希望避免浏览器之外。

3. 如果 Zebra 打印机设置为使用通用/文本驱动程序，我可以在 Notepad.exe 中打开 ZPL 文件，并使用“文件 ->”将 ZPL 发送到打印机。打印。在这种情况下，Zebra 打印机会将文本解释为 ZPL 指令，而不是实际文本。有什么方法可以从浏览器“利用”这个吗？尝试了几种方法，例如简单地在浏览器中打开ZPL文件，然后执行“File ->”打印，但这似乎不起作用。还尝试从 Javascript windows.print();

4. 是否有任何其他插件（java applet、flash 等）能够将原始文本（例如 ZPL）发送到 Zebra 打印机？

5. 将 ZPL 转换为图像（或 pdf:s）。有这样的工具吗？

还有其他想法吗？

Answer 1

在 Silverlight 5 中，当您打开增强的安全性时，您可以打印原始文本。这是我所做的：

private void Button_Click(object sender, RoutedEventArgs e)
{
    StringBuilder label = new StringBuilder();
    label.AppendLine("^XA^MCA^PR8^XZ");
    label.AppendLine("^XA");
    label.AppendLine("^DFCTN^FS");
    label.AppendLine("^LH110,0^FS");
    label.Append("^FO0,60^A0,30,20^FB250,1,0,C,0^FD");
    label.Append(CategoryTextBox.Text.TrimEnd());
    label.AppendLine("^FS");
    label.AppendLine("^FO5,120^A0,40,30^FB250,1,0,C,0^FR^FN1^FS");
    label.AppendLine("^XZ");
    label.AppendLine("^XA");
    label.AppendLine("^XFCTN^FS");
    label.Append("^FO10,100");
    label.Append("^B3N,N,40,Y^FD");
    label.Append(LicensePlateTextBox.Text.TrimEnd());
    label.AppendLine("^FS");
    label.AppendLine("^XZ");

    bool result = RawPrinterHelper.SendStringToPrinter("Zebra Label Printer", label.ToString());
    if (!result)
    {
        MessageBox.Show("Error Returned From Print Spool.  Check Setup.");
    }
}

RawPrintHelper 类：

using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;

namespace TestPrinting
{
    public class RawPrinterHelper
    {
        // Structure and API declarions:
        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
        public class DOCINFOA
        {
            [MarshalAs(UnmanagedType.LPStr)]
            public string pDocName;
            [MarshalAs(UnmanagedType.LPStr)]
            public string pOutputFile;
            [MarshalAs(UnmanagedType.LPStr)]
            public string pDataType;
        }
        [DllImport("winspool.Drv", EntryPoint = "OpenPrinterA", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
        public static extern bool OpenPrinter([MarshalAs(UnmanagedType.LPStr)] string szPrinter, out IntPtr hPrinter, IntPtr pd);

        [DllImport("winspool.Drv", EntryPoint = "ClosePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
        public static extern bool ClosePrinter(IntPtr hPrinter);

        [DllImport("winspool.Drv", EntryPoint = "StartDocPrinterA", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
        public static extern bool StartDocPrinter(IntPtr hPrinter, Int32 level, [In, MarshalAs(UnmanagedType.LPStruct)] DOCINFOA di);

        [DllImport("winspool.Drv", EntryPoint = "EndDocPrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
        public static extern bool EndDocPrinter(IntPtr hPrinter);

        [DllImport("winspool.Drv", EntryPoint = "StartPagePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
        public static extern bool StartPagePrinter(IntPtr hPrinter);

        [DllImport("winspool.Drv", EntryPoint = "EndPagePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
        public static extern bool EndPagePrinter(IntPtr hPrinter);

        [DllImport("winspool.Drv", EntryPoint = "WritePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
        public static extern bool WritePrinter(IntPtr hPrinter, IntPtr pBytes, Int32 dwCount, out Int32 dwWritten);

        // SendBytesToPrinter()
        // When the function is given a printer name and an unmanaged array
        // of bytes, the function sends those bytes to the print queue.
        // Returns true on success, false on failure.
        public static bool SendBytesToPrinter(string szPrinterName, IntPtr pBytes, Int32 dwCount)
        {
            Int32 dwError = 0, dwWritten = 0;
            IntPtr hPrinter = new IntPtr(0);
            DOCINFOA di = new DOCINFOA();
            bool bSuccess = false; // Assume failure unless you specifically succeed.

            di.pDocName = "Document";
            di.pDataType = "RAW";

            // Open the printer.
            if (OpenPrinter(szPrinterName, out hPrinter, IntPtr.Zero))
            {
                // Start a document.
                if (StartDocPrinter(hPrinter, 1, di))
                {
                    // Start a page.
                    if (StartPagePrinter(hPrinter))
                    {
                        // Write your bytes.
                        bSuccess = WritePrinter(hPrinter, pBytes, dwCount, out dwWritten);
                        EndPagePrinter(hPrinter);
                    }
                    EndDocPrinter(hPrinter);
                }
                ClosePrinter(hPrinter);
            }
            // If you did not succeed, GetLastError may give more information
            // about why not.
            if (bSuccess == false)
            {
                dwError = Marshal.GetLastWin32Error();
            }
            return bSuccess;
        }

        public static bool SendStringToPrinter(string szPrinterName, string pDoc)
        {
            MemoryStream stream = new MemoryStream(Encoding.UTF8.GetBytes(pDoc));
            byte[] rawData = new byte[stream.Length];
            stream.Read(rawData, 0, (int)stream.Length);
            GCHandle rawDataHandle = GCHandle.Alloc(rawData, GCHandleType.Pinned);
            IntPtr pointer = rawDataHandle.AddrOfPinnedObject();
            return SendBytesToPrinter(szPrinterName, pointer, rawData.Length);
        }
    }
}

Answer 2

如果打印机直接连接到网络，您可以打开端口 9100 的套接字并向那里发送 ZPL 代码。

Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream,
    ProtocolType.Tcp);
SocketAsyncEventArgs args = new SocketAsyncEventArgs();
args.RemoteEndPoint = new IPEndPoint("192.168.0.2", 9100);
args.UserToken = sock;
args.Completed += (s,e) => {
    if (e.SocketError == SocketError.Success)
    {
        string zpl = string.Format(
            @"
^XA^MCA^PR8^XZ
^XA
^DFCTN^FS
^LH110,0^FS
^FO0,60^A0,30,20^FB250,1,0,C,0^FD{0}^FS
^FO5,120^A0,40,30^FB250,1,0,C,0^FR^FN1^FS
^XZ
^XA
^XFCTN^FS
^FO10,100^B3N,N,40,Y^FD{1}^FS
^XZ
            ".Trim(),
            category, licencePlate);
        byte[] buf = Encoding.UTF8.GetBytes(zpl);
        e.SetBuffer(buf, 0, buf.Length);
        sock.SendAsync(e);
    }
};

sock.ConnectAsync(args);

不幸的是，Silverlight 只允许在 端口 4502- 上进行套接字连接4534，除非它以提升的权限运行。您必须将 silverlight 应用程序作为受信任的应用程序运行，将打印机配置为侦听安全端口，或者通过服务器进行中继。

Answer 3

您可以使用这个精彩的 Java 小程序 jZebra http://code.google.com/p/jzebra/ 它将原始数据发送到任何打印机。