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？
答案 0 :(得分：12)
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
}
答案 1 :(得分：6)
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
}
答案 2 :(得分：2)
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：
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。
答案 3 :(得分：1)
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。
答案 4 :(得分：0)
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);