Question

我正试图找到一种将图像打印到斑马并且遇到很多麻烦的方法。

根据文件：

第一种编码，称为B64，使用MIME对数据进行编码   Base64计划。 Base64用于编码电子邮件地址...
  Base64对该字节进行6位编码，扩展为33％   在未封闭的数据上。
第二种编码，称为Z64，   首先使用LZ77算法压缩数据以减小其大小。   （该算法由PKZIP使用，与PNG是一体的   图形格式。）
然后使用。编码压缩数据   如上所述的MIME Base64方案。
将计算CRC   与Base64编码的数据相对应。

但它没有更多信息。

基本上我用

进行编码

private byte[] GetItemFromPath(string filepath)
{   
    using (MemoryStream ms = new MemoryStream())
    {
        using (Image img = Image.FromFile(filepath))
        {
            img.Save(ms, ImageFormat.Png);
            return ms.ToArray();
        }
    }
}

然后尝试用以下内容进行打印：

var initialArray = GetItemFromPath("C:\\RED.png");
string converted = Convert.ToBase64String(b);

PrintThis(string.Format(@"~DYRED.PNG,P,P,{1},0,:B64:
{0}
^XA
^F0200,200^XGRED.PNG,1,1^FS
^XZ", converted .ToString(), initialArray.Length));

从声音来看，B64或Z64都被接受了。

我尝试了一些变体，以及几种生成CRC和计算'大小'的方法。但似乎没有工作，并且图形下载到打印机总是被中止。

有没有人设法完成这样的事情？或者知道我哪里出错了？

Answer 1

我对此答案的所有赞誉来自LabView Forum用户Raydur。他发布了一个可以在LabView中打开的LabView解决方案，用于发送图像。我个人没有用我的打印机运行它，我只是用它来找出正确的图像代码，所以我可以在我的代码中复制它。我遗漏的重要事情是填充我的十六进制代码。例如：1A很好，但是如果你只有A，你需要在它前面填0以发送0A。您发送的ZPL中文件的大小也是字节数组的原始大小，而不是数据的最终字符串表示形式。

我已经搜索过很多很多很多论坛和Stackoverflow帖子，试图解决这个问题，因为看起来这么简单。我已尝试在其他地方发布的每一个解决方案，但我真的只想打印一个.PNG，因为我的打印机手册（Mobile QLN320）支持它内置。它说要么用Base64或Hexadecimal发送，我试过两者都无济于事。对于任何想要做Base64的人，我在一本较旧的手册中发现，你需要为你发送的每个数据包手动计算CRC码，所以我选择了更简单的十六进制路由。所以这是我开始工作的代码！

        string ipAddress = "192.168.1.30";
        int port = 6101;

        string zplImageData = string.Empty;
        //Make sure no transparency exists. I had some trouble with this. This PNG has a white background
        string filePath = @"C:\Users\Path\To\Logo.png";
        byte[] binaryData = System.IO.File.ReadAllBytes(filePath);
        foreach (Byte b in binaryData)
        {
            string hexRep = String.Format("{0:X}", b);
            if (hexRep.Length == 1)
                hexRep = "0" + hexRep;
            zplImageData += hexRep;
          }
          string zplToSend = "^XA" + "^MNN" + "^LL500" + "~DYE:LOGO,P,P," + binaryData.Length + ",," + zplImageData+"^XZ";
          string printImage = "^XA^FO115,50^IME:LOGO.PNG^FS^XZ";

        try
        {
            // Open connection
            System.Net.Sockets.TcpClient client = new System.Net.Sockets.TcpClient();
            client.Connect(ipAddress, port);

            // Write ZPL String to connection
            System.IO.StreamWriter writer = new System.IO.StreamWriter(client.GetStream(),Encoding.UTF8);
            writer.Write(zplToSend);
            writer.Flush();
            writer.Write(printImage);
            writer.Flush();
            // Close Connection
            writer.Close();
            client.Close();
        }
        catch (Exception ex)
        {
            // Catch Exception
        }

Answer 2

ZPL II Programming Guide记录~DG命令和GRF格式（第124页）以下载图像。 Volume Two添加了有关可选压缩格式的详细信息（第52页）。

首先，您必须将图像转换为1bpp双层图像，然后将其转换为十六进制编码的字符串。您可以进一步压缩图像以减少传输时间。然后，您可以使用^ID命令打印图像。

虽然~DY命令中对PNG图像有固有的支持，但它的文档记录很少，似乎不适用于某些型号的打印机。 ZB64格式基本上没有记录，尝试从Zebra支持获取更多信息也没有结果。如果您的心设置在ZB64上，则可以使用Java based Zebralink SDK（查看ImagePrintDemo.java和com.zebra.sdk.printer.internal.GraphicsConversionUtilZpl.sendImageToStream）。

获得命令数据后，如果打印机有打印服务器，则可以通过TCP / IP发送，也可以通过以RAW格式写入打印机来发送。

下面的代码将5 kB PNG打印为13 kB压缩GRF（60 kB未压缩）：

class Program
{
    static unsafe void Main(string[] args)
    {
        var baseStream = new MemoryStream();
        var tw = new StreamWriter(baseStream, Encoding.UTF8);

        using (var bmpSrc = new Bitmap(Image.FromFile(@"label.png")))
        {
            tw.WriteLine(ZplImage.GetGrfStoreCommand("R:LBLRA2.GRF", bmpSrc));
        }
        tw.WriteLine(ZplImage.GetGrfPrintCommand("R:LBLRA2.GRF"));
        tw.WriteLine(ZplImage.GetGrfDeleteCommand("R:LBLRA2.GRF"));

        tw.Flush();
        baseStream.Position = 0;

        var gdipj = new GdiPrintJob("ZEBRA S4M-200dpi ZPL", GdiPrintJobDataType.Raw, "Raw print", null);
        gdipj.WritePage(baseStream);
        gdipj.CompleteJob();
    }
}

class ZplImage
{
    public static string GetGrfStoreCommand(string filename, Bitmap bmpSource)
    {
        if (bmpSource == null)
        {
            throw new ArgumentNullException("bmpSource");
        }
        validateFilename(filename);

        var dim = new Rectangle(Point.Empty, bmpSource.Size);
        var stride = ((dim.Width + 7) / 8);
        var bytes = stride * dim.Height;

        using (var bmpCompressed = bmpSource.Clone(dim, PixelFormat.Format1bppIndexed))
        {
            var result = new StringBuilder();

            result.AppendFormat("^XA~DG{2},{0},{1},", stride * dim.Height, stride, filename);
            byte[][] imageData = GetImageData(dim, stride, bmpCompressed);

            byte[] previousRow = null;
            foreach (var row in imageData)
            {
                appendLine(row, previousRow, result);
                previousRow = row;
            }
            result.Append(@"^FS^XZ");

            return result.ToString();
        }
    }

    public static string GetGrfDeleteCommand(string filename)
    {
        validateFilename(filename);

        return string.Format("^XA^ID{0}^FS^XZ", filename);
    }

    public static string GetGrfPrintCommand(string filename)
    {
        validateFilename(filename);

        return string.Format("^XA^FO0,0^XG{0},1,1^FS^XZ", filename);
    }

    static Regex regexFilename = new Regex("^[REBA]:[A-Z0-9]{1,8}\\.GRF$");

    private static void validateFilename(string filename)
    {
        if (!regexFilename.IsMatch(filename))
        {
            throw new ArgumentException("Filename must be in the format "
                + "R:XXXXXXXX.GRF.  Drives are R, E, B, A.  Filename can "
                + "be alphanumeric between 1 and 8 characters.", "filename");
        }
    }

    unsafe private static byte[][] GetImageData(Rectangle dim, int stride, Bitmap bmpCompressed)
    {
        byte[][] imageData;
        var data = bmpCompressed.LockBits(dim, ImageLockMode.ReadOnly, PixelFormat.Format1bppIndexed);
        try
        {
            byte* pixelData = (byte*)data.Scan0.ToPointer();
            byte rightMask = (byte)(0xff << (data.Stride * 8 - dim.Width));
            imageData = new byte[dim.Height][];

            for (int row = 0; row < dim.Height; row++)
            {
                byte* rowStart = pixelData + row * data.Stride;
                imageData[row] = new byte[stride];

                for (int col = 0; col < stride; col++)
                {
                    byte f = (byte)(0xff ^ rowStart[col]);
                    f = (col == stride - 1) ? (byte)(f & rightMask) : f;
                    imageData[row][col] = f;
                }
            }
        }
        finally
        {
            bmpCompressed.UnlockBits(data);
        }
        return imageData;
    }

    private static void appendLine(byte[] row, byte[] previousRow, StringBuilder baseStream)
    {
        if (row.All(r => r == 0))
        {
            baseStream.Append(",");
            return;
        }

        if (row.All(r => r == 0xff))
        {
            baseStream.Append("!");
            return;
        }

        if (previousRow != null && MatchByteArray(row, previousRow))
        {
            baseStream.Append(":");
            return;
        }

        byte[] nibbles = new byte[row.Length * 2];
        for (int i = 0; i < row.Length; i++)
        {
            nibbles[i * 2] = (byte)(row[i] >> 4);
            nibbles[i * 2 + 1] = (byte)(row[i] & 0x0f);
        }

        for (int i = 0; i < nibbles.Length; i++)
        {
            byte cPixel = nibbles[i];

            int repeatCount = 0;
            for (int j = i; j < nibbles.Length && repeatCount <= 400; j++)
            {
                if (cPixel == nibbles[j])
                {
                    repeatCount++;
                }
                else
                {
                    break;
                }
            }

            if (repeatCount > 2)
            {
                if (repeatCount == nibbles.Length - i
                    && (cPixel == 0 || cPixel == 0xf))
                {
                    if (cPixel == 0)
                    {
                        if (i % 2 == 1)
                        {
                            baseStream.Append("0");
                        }
                        baseStream.Append(",");
                        return;
                    }
                    else if (cPixel == 0xf)
                    {
                        if (i % 2 == 1)
                        {
                            baseStream.Append("F");
                        }
                        baseStream.Append("!");
                        return;
                    }
                }
                else
                {
                    baseStream.Append(getRepeatCode(repeatCount));
                    i += repeatCount - 1;
                }
            }
            baseStream.Append(cPixel.ToString("X"));
        }
    }

    private static string getRepeatCode(int repeatCount)
    {
        if (repeatCount > 419)
            throw new ArgumentOutOfRangeException();

        int high = repeatCount / 20;
        int low = repeatCount % 20;

        const string lowString = " GHIJKLMNOPQRSTUVWXY";
        const string highString = " ghijklmnopqrstuvwxyz";

        string repeatStr = "";
        if (high > 0)
        {
            repeatStr += highString[high];
        }
        if (low > 0)
        {
            repeatStr += lowString[low];
        }

        return repeatStr;
    }

    private static bool MatchByteArray(byte[] row, byte[] previousRow)
    {
        for (int i = 0; i < row.Length; i++)
        {
            if (row[i] != previousRow[i])
            {
                return false;
            }
        }

        return true;
    }
}

internal static class NativeMethods
{
    #region winspool.drv

    #region P/Invokes

    [DllImport("winspool.Drv", SetLastError = true, CharSet = CharSet.Unicode)]
    internal static extern bool OpenPrinter(string szPrinter, out IntPtr hPrinter, IntPtr pd);

    [DllImport("winspool.Drv", SetLastError = true, CharSet = CharSet.Unicode)]
    internal static extern bool ClosePrinter(IntPtr hPrinter);

    [DllImport("winspool.Drv", SetLastError = true, CharSet = CharSet.Unicode)]
    internal static extern UInt32 StartDocPrinter(IntPtr hPrinter, Int32 level, IntPtr di);

    [DllImport("winspool.Drv", SetLastError = true, CharSet = CharSet.Unicode)]
    internal static extern bool EndDocPrinter(IntPtr hPrinter);

    [DllImport("winspool.Drv", SetLastError = true, CharSet = CharSet.Unicode)]
    internal static extern bool StartPagePrinter(IntPtr hPrinter);

    [DllImport("winspool.Drv", SetLastError = true, CharSet = CharSet.Unicode)]
    internal static extern bool EndPagePrinter(IntPtr hPrinter);

    [DllImport("winspool.Drv", SetLastError = true, CharSet = CharSet.Unicode)]
    internal static extern bool WritePrinter(
        // 0
        IntPtr hPrinter,
        [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 2)] byte[] pBytes,
        // 2
        UInt32 dwCount,
        out UInt32 dwWritten);

    #endregion

    #region Structs

    [StructLayout(LayoutKind.Sequential)]
    internal struct DOC_INFO_1
    {
        [MarshalAs(UnmanagedType.LPWStr)]
        public string DocName;
        [MarshalAs(UnmanagedType.LPWStr)]
        public string OutputFile;
        [MarshalAs(UnmanagedType.LPWStr)]
        public string Datatype;
    }

    #endregion

    #endregion
}

/// <summary>
/// Represents a print job in a spooler queue
/// </summary>
public class GdiPrintJob
{
    IntPtr PrinterHandle;
    IntPtr DocHandle;

    /// <summary>
    /// The ID assigned by the print spooler to identify the job
    /// </summary>
    public UInt32 PrintJobID { get; private set; }

    /// <summary>
    /// Create a print job with a enumerated datatype
    /// </summary>
    /// <param name="PrinterName"></param>
    /// <param name="dataType"></param>
    /// <param name="jobName"></param>
    /// <param name="outputFileName"></param>
    public GdiPrintJob(string PrinterName, GdiPrintJobDataType dataType, string jobName, string outputFileName)
        : this(PrinterName, translateType(dataType), jobName, outputFileName)
    {
    }

    /// <summary>
    /// Create a print job with a string datatype
    /// </summary>
    /// <param name="PrinterName"></param>
    /// <param name="dataType"></param>
    /// <param name="jobName"></param>
    /// <param name="outputFileName"></param>
    public GdiPrintJob(string PrinterName, string dataType, string jobName, string outputFileName)
    {
        if (string.IsNullOrWhiteSpace(PrinterName))
            throw new ArgumentNullException("PrinterName");
        if (string.IsNullOrWhiteSpace(dataType))
            throw new ArgumentNullException("PrinterName");

        IntPtr hPrinter;
        if (!NativeMethods.OpenPrinter(PrinterName, out hPrinter, IntPtr.Zero))
            throw new Win32Exception();
        this.PrinterHandle = hPrinter;

        NativeMethods.DOC_INFO_1 docInfo = new NativeMethods.DOC_INFO_1()
        {
            DocName = jobName,
            Datatype = dataType,
            OutputFile = outputFileName
        };
        IntPtr pDocInfo = Marshal.AllocHGlobal(Marshal.SizeOf(docInfo));
        RuntimeHelpers.PrepareConstrainedRegions();
        try
        {
            Marshal.StructureToPtr(docInfo, pDocInfo, false);
            UInt32 docid = NativeMethods.StartDocPrinter(hPrinter, 1, pDocInfo);
            if (docid == 0)
                throw new Win32Exception();
            this.PrintJobID = docid;
        }
        finally
        {
            Marshal.FreeHGlobal(pDocInfo);
        }
    }

    /// <summary>
    /// Write the data of a single page or a precomposed PCL document
    /// </summary>
    /// <param name="data"></param>
    public void WritePage(Stream data)
    {
        if (data == null)
            throw new ArgumentNullException("data");
        if (!data.CanRead && !data.CanWrite)
            throw new ObjectDisposedException("data");
        if (!data.CanRead)
            throw new NotSupportedException("stream is not readable");

        if (!NativeMethods.StartPagePrinter(this.PrinterHandle))
            throw new Win32Exception();

        byte[] buffer = new byte[0x14000]; /* 80k is Stream.CopyTo default */
        uint read = 1;
        while ((read = (uint)data.Read(buffer, 0, buffer.Length)) != 0)
        {
            UInt32 written;
            if (!NativeMethods.WritePrinter(this.PrinterHandle, buffer, read, out written))
                throw new Win32Exception();

            if (written != read)
                throw new InvalidOperationException("Error while writing to stream");
        }

        if (!NativeMethods.EndPagePrinter(this.PrinterHandle))
            throw new Win32Exception();
    }

    /// <summary>
    /// Complete the current job
    /// </summary>
    public void CompleteJob()
    {
        if (!NativeMethods.EndDocPrinter(this.PrinterHandle))
            throw new Win32Exception();
    }

    #region datatypes
    private readonly static string[] dataTypes = new string[] 
    { 
        // 0
        null, 
        "RAW", 
        // 2
        "RAW [FF appended]",
        "RAW [FF auto]",
        // 4
        "NT EMF 1.003", 
        "NT EMF 1.006",
        // 6
        "NT EMF 1.007", 
        "NT EMF 1.008", 
        // 8
        "TEXT", 
        "XPS_PASS", 
        // 10
        "XPS2GDI" 
    };

    private static string translateType(GdiPrintJobDataType type)
    {
        return dataTypes[(int)type];
    }
    #endregion
}

public enum GdiPrintJobDataType
{
    Unknown = 0,
    Raw = 1,
    RawAppendFF = 2,
    RawAuto = 3,
    NtEmf1003 = 4,
    NtEmf1006 = 5,
    NtEmf1007 = 6,
    NtEmf1008 = 7,
    Text = 8,
    XpsPass = 9,
    Xps2Gdi = 10
}

Answer 3

出于某种原因，我无法让B64工作，但幸运的是，我能够使用普通的旧版本，以谷歌的方式制作Z64（在3个灵魂搜索日内）。

在ZPL编程指南的其他地方，您偶然发现了CISDFCRC16命令 - 让我们神秘，为什么不呢 - 部分说明：

“字段的值计算为CRC-16 使用CRC16-CCITT多项式的指定文件的内容 x ^ 16 + x ^ 12 + x ^ 5 + 1.使用初始CRC计算 0×0000“。

除了Japanglish之外，您现在可以查看 16位（http://reveng.sourceforge.net/crc-catalogue/16.htm）的参数化CRC算法目录，并查找XMODEM算法，该算法恰好是

width=16 poly=0x1021 init=0x0000 refin=false refout=false
xorout=0x0000 check=0x31c3 name="XMODEM"

啊哈。然后我开始寻找我需要的其余代码并偶然发现以下内容：

基于LZ77算法的JavaScript压缩器（http://lab.polygonpla.net/js/tinylz77.html）
基64.js （https://github.com/beatgammit/base64-js/blob/master/lib/b64.js）
Lammert Bies的2008 CRC图书馆（http://www.lammertbies.nl/comm/info/crc-calculation.html）移植来自ANSI C - 具有预防性和按位AND 使用0xffff更新函数返回值，因为JavaScript 将每个数字视为32位有符号整数。

所以我把文件作为字节数组（Uint8Array）读取，将其解析为字符串，用LZ77压缩它，然后将其转换为字节数组并使用base64对其进行编码，此时我计算CRC并粘贴它全部进入我的ZPL~DT命令节省约40％。美丽。

不幸的是我正在开发专有解决方案，因此我无法发布任何代码。

祝你好运！

- 另一个人做了另一个人可以做的事。

Answer 4

查看ZPL手册后，您需要计算图像的循环冗余校验（CRC）。这是一些计算CRC（source）的C代码：

// Update the CRC for transmitted and received data using
// the CCITT 16bit algorithm (X^16 + X^12 + X^5 + 1).

unsigned char ser_data;
static unsigned int crc;

crc  = (unsigned char)(crc >> 8) | (crc << 8);
crc ^= ser_data;
crc ^= (unsigned char)(crc & 0xff) >> 4;
crc ^= (crc << 8) << 4;
crc ^= ((crc & 0xff) << 4) << 1;

您也可以参考维基百科关于CRC的页面，因为它还包含其他代码示例。

https://en.wikipedia.org/wiki/Cyclic_redundancy_check

你发送的其他东西看起来都不错。我会考虑使用一个Zebra SDK。我知道Android会将图像发送到打印机并为您保存。

Answer 5

尽管此问题具有C＃标记，但其他几个答案也不完全是C＃，因此这是使用Node 8.5+（javascript），使用Java和Zebra SDK的答案。对于同样可以使用SDK并执行POST请求的任何.NET语言，相同的步骤非常相似。

const { promisify } = require('util');
const java = require('java');
java.asyncOptions = {
  asyncSuffix: "",
  syncSuffix: "Sync",
  promiseSuffix: "Promise", // Generate methods returning promises, using the suffix Promise.
  promisify
};
// Include all .jar's under C:\Program Files\Zebra Technologies\link_os_sdk\PC\v2.14.5198\lib
// in your lib folder
java.classpath.push(__dirname + "/lib/ZSDK_API.jar"); 

var ByteArrayOutputStream = java.import('java.io.ByteArrayOutputStream');
var ZebraImageFactory = java.import('com.zebra.sdk.graphics.ZebraImageFactory');
var PrinterUtil = java.import('com.zebra.sdk.printer.PrinterUtil');

const main = async function () {
  let path = `C:\\images\\yourimage.png`;
  let os = new ByteArrayOutputStream();
  let image = await ZebraImageFactory.getImagePromise(path);
  PrinterUtil.convertGraphicPromise("E:IMAGE.PNG", image, os);
  console.log(os.toStringSync()); // junk:Z64:~:CRC
  console.log('done');
};
main();

然后您可以通过ZPL打印图像，如下所示：

^XA
~DYE:IMAGE,P,P,1,,:B64:<YOURB64>:<YOURCRC>
^FO0,0^IME:IMAGE.PNG
^XZ

使用类似

await axios.post(`${printer.ip}/pstprnt`, zpl);

将PNG图像打印到斑马网络打印机

5 个答案: