基于Win服务的标签打印(模板套打)

2021-01-25 15:14

阅读：514

标签：read 方案 body 配置文件 net string for 产品 ble

最近做了几个项目，都有在产品贴标的需求

基本就是有个证卡类打印机，然后把产品的信息打印在标签上。

然后通过机器人把标签贴到产品上面

标签信息包括文本，二维码，条形码之类的，要根据对应的数据生成二维码，条形码。

打印标签的需求接到手后，开始了我的填坑之旅。

打印3.0源代码：https://github.com/zeqp/ZEQP.Print

打印1.0

第一个项目开始，因为原来没有研究过打印，所以在Bing上查了一下.Net打印机关的资料

发现基本上都是基于.net的
System.Drawing.Printing.PrintDocument
这个类来做自定义打印

大家都用这个做打印，我想按理也没有问题。

所以开始了我的代码。

PrintDocument去做打印，无非就是设置好打印机名称，
DefaultPageSettings.PrinterSettings.PrinterName
打印份数
DefaultPageSettings.PrinterSettings.Copies
纸张方向
DefaultPageSettings.Landscape
然后打印的具体的信息就是事件PrintPage写进去
然后调用
Graphics.DrawString,Graphics.DrawImage来写入具体的文本与图片
Graphics.Draw的时候要指定字体，颜色，位置等数据
我把这些做成配置数据。
然后1.0版本就成了。
技术图片

下图为位置的配置文件
技术图片

代码一写完，用VS调试的时候。跑得飞起。、

所有的字体，要打印数据的位置也通过配置文件可以动态的调整。感觉还算完美。
但是现实很骨感，马上就拍拍打脸了

PrintDocument类只能以WinForm的方式运行，不能以服务的方式运行。
具体可以参考：https://docs.microsoft.com/zh-cn/dotnet/api/system.drawing.printing?redirectedfrom=MSDN&view=netframework-4.8

技术图片

幸好客户方面没有什么要求，而且生产的时候会有一台专门的上位机可以做这个事，所以做了一个无界面的WinForm。在电脑启动的时候运行

从而解决了不能以服务的方式运行的问题。

打印2.0

做完打印1.0后，又接到了一个项目。又是有打印相关的功能，自然又分配到我这里来了。

但是对于上一个版本的打印。不能做为服务运行，做为自己写的一个程序，居然有这么大的瑕疵。总感觉心里不爽

想去解决这个问题，但是在Bing上找到.Net的所有打印都是这样做的。也找不到什么更好的方法。

只到问了很多相关的相关人士。最后给了我一个第三方的商业解决方案BarTender
相关参考：https://www.bartendersoftware.com/
这个有自己的模板编辑器，
技术图片

有自己的SDK，有编辑器，功能也非学强大。不愧是商业打印解决方案。

根据他的SDK，同时安装了相关程序，写下几句打印代码。一个基于Win服务的打印出来了

技术图片

于是。打印2.0出来了。

打印3.0
但是对于一个基于第三方的商业打印方案，所有功能都是很强大。实现也简单。

就是对于一般公司的小项目。挣的钱还不够买这个商业套件的License

而且对于一个只会使用别人家的SDK的程序。不是一个有灵魂的程序。

因为你都不知道人家背后是怎么实现的。原理是什么都不知道。

对于我，虽然能把这个项目用BarTender完成。但是总是对这个打印方案不是很满意。

因为我只在这个上面加了一层壳。不知道后面做了什么。

所以我一直想自己开发一个可以基于Win服务运行的打印程序。最好也要有自己的模板编辑器。

只到有一天。无意找到一篇文章

https://docs.aspose.com/display/wordsnet/Print+a+Document

他这里也解释了有关基于服务的打印有关的问题不能解决。

并且他们已经找到了对应的解决方案。基于他的解决方案。写了对应一个打印帮助类。

这个是基于Windows的XPS文档API打印。

XPS是在Win 7后就是windows支持的打印文档类型类比PDF

基本 XpsPrint API 的相关说明

同时基本他的XPS打印帮助类。我做了测试。可以完美的在Windows服务里面运行关打印。

  1 namespace ZEQP.Print.Framework
  2 {
  3     /// 
  4     /// A utility class that converts a document to XPS using Aspose.Words and then sends to the XpsPrint API.
  5     /// 
  6     public class XpsPrintHelper
  7     {
  8         /// 
  9         /// No ctor.
 10         /// 
 11         private XpsPrintHelper()
 12         {
 13         }
 14 
 15         // ExStart:XpsPrint_PrintDocument       
 16         // ExSummary:Convert an Aspose.Words document into an XPS stream and print.
 17         /// 
 18         /// Sends an Aspose.Words document to a printer using the XpsPrint API.
 19         /// 
 20         /// 
 21         /// 
 22         /// Job name. Can be null.
 23         /// True to wait for the job to complete. False to return immediately after submitting the job.
 24         /// Thrown if any error occurs.
 25         public static void Print(string xpsFile, string printerName, string jobName, bool isWait)
 26         {
 27             Console.WriteLine("Print");
 28             if (!File.Exists(xpsFile))
 29                 throw new ArgumentNullException("xpsFile");
 30             using (var stream = File.OpenRead(xpsFile))
 31             {
 32                 Print(stream, printerName, jobName, isWait);
 33             }
 34             //// Use Aspose.Words to convert the document to XPS and store in a memory stream.
 35             //File.OpenRead
 36             //MemoryStream stream = new MemoryStream();
 37 
 38             //stream.Position = 0;
 39             //Console.WriteLine("Saved as Xps");
 40             //Print(stream, printerName, jobName, isWait);
 41             Console.WriteLine("After Print");
 42         }
 43         // ExEnd:XpsPrint_PrintDocument
 44         // ExStart:XpsPrint_PrintStream        
 45         // ExSummary:Prints an XPS document using the XpsPrint API.
 46         /// 
 47         /// Sends a stream that contains a document in the XPS format to a printer using the XpsPrint API.
 48         /// Has no dependency on Aspose.Words, can be used in any project.
 49         /// 
 50         /// 
 51         /// 
 52         /// Job name. Can be null.
 53         /// True to wait for the job to complete. False to return immediately after submitting the job.
 54         /// Thrown if any error occurs.
 55         public static void Print(Stream stream, string printerName, string jobName, bool isWait)
 56         {
 57             if (stream == null)
 58                 throw new ArgumentNullException("stream");
 59             if (printerName == null)
 60                 throw new ArgumentNullException("printerName");
 61 
 62             // Create an event that we will wait on until the job is complete.
 63             IntPtr completionEvent = CreateEvent(IntPtr.Zero, true, false, null);
 64             if (completionEvent == IntPtr.Zero)
 65                 throw new Win32Exception();
 66 
 67             //            try
 68             //            {
 69             IXpsPrintJob job;
 70             IXpsPrintJobStream jobStream;
 71             Console.WriteLine("StartJob");
 72             StartJob(printerName, jobName, completionEvent, out job, out jobStream);
 73             Console.WriteLine("Done StartJob");
 74             Console.WriteLine("Start CopyJob");
 75             CopyJob(stream, job, jobStream);
 76             Console.WriteLine("End CopyJob");
 77 
 78             Console.WriteLine("Start Wait");
 79             if (isWait)
 80             {
 81                 WaitForJob(completionEvent);
 82                 CheckJobStatus(job);
 83             }
 84             Console.WriteLine("End Wait");
 85             /*            }
 86                         finally
 87                         {
 88                             if (completionEvent != IntPtr.Zero)
 89                                 CloseHandle(completionEvent);
 90                         }
 91             */
 92             if (completionEvent != IntPtr.Zero)
 93                 CloseHandle(completionEvent);
 94             Console.WriteLine("Close Handle");
 95         }
 96         // ExEnd:XpsPrint_PrintStream
 97 
 98         private static void StartJob(string printerName, string jobName, IntPtr completionEvent, out IXpsPrintJob job, out IXpsPrintJobStream jobStream)
 99         {
100             int result = StartXpsPrintJob(printerName, jobName, null, IntPtr.Zero, completionEvent,
101                 null, 0, out job, out jobStream, IntPtr.Zero);
102             if (result != 0)
103                 throw new Win32Exception(result);
104         }
105 
106         private static void CopyJob(Stream stream, IXpsPrintJob job, IXpsPrintJobStream jobStream)
107         {
108 
109             //            try
110             //            {
111             byte[] buff = new byte[4096];
112             while (true)
113             {
114                 uint read = (uint)stream.Read(buff, 0, buff.Length);
115                 if (read == 0)
116                     break;
117 
118                 uint written;
119                 jobStream.Write(buff, read, out written);
120 
121                 if (read != written)
122                     throw new Exception("Failed to copy data to the print job stream.");
123             }
124 
125             // Indicate that the entire document has been copied.
126             jobStream.Close();
127             //            }
128             //            catch (Exception)
129             //            {
130             //                // Cancel the job if we had any trouble submitting it.
131             //                job.Cancel();
132             //                throw;
133             //            }
134         }
135 
136         private static void WaitForJob(IntPtr completionEvent)
137         {
138             const int INFINITE = -1;
139             switch (WaitForSingleObject(completionEvent, INFINITE))
140             {
141                 case WAIT_RESULT.WAIT_OBJECT_0:
142                     // Expected result, do nothing.
143                     break;
144                 case WAIT_RESULT.WAIT_FAILED:
145                     throw new Win32Exception();
146                 default:
147                     throw new Exception("Unexpected result when waiting for the print job.");
148             }
149         }
150 
151         private static void CheckJobStatus(IXpsPrintJob job)
152         {
153             XPS_JOB_STATUS jobStatus;
154             job.GetJobStatus(out jobStatus);
155             switch (jobStatus.completion)
156             {
157                 case XPS_JOB_COMPLETION.XPS_JOB_COMPLETED:
158                     // Expected result, do nothing.
159                     break;
160                 case XPS_JOB_COMPLETION.XPS_JOB_FAILED:
161                     throw new Win32Exception(jobStatus.jobStatus);
162                 default:
163                     throw new Exception("Unexpected print job status.");
164             }
165         }
166 
167         [DllImport("XpsPrint.dll", EntryPoint = "StartXpsPrintJob")]
168         private static extern int StartXpsPrintJob(
169             [MarshalAs(UnmanagedType.LPWStr)] String printerName,
170             [MarshalAs(UnmanagedType.LPWStr)] String jobName,
171             [MarshalAs(UnmanagedType.LPWStr)] String outputFileName,
172             IntPtr progressEvent,   // HANDLE
173             IntPtr completionEvent, // HANDLE
174             [MarshalAs(UnmanagedType.LPArray)] byte[] printablePagesOn,
175             UInt32 printablePagesOnCount,
176             out IXpsPrintJob xpsPrintJob,
177             out IXpsPrintJobStream documentStream,
178             IntPtr printTicketStream);  // This is actually "out IXpsPrintJobStream", but we don‘t use it and just want to pass null, hence IntPtr.
179 
180         [DllImport("Kernel32.dll", SetLastError = true)]
181         private static extern IntPtr CreateEvent(IntPtr lpEventAttributes, bool bManualReset, bool bInitialState, string lpName);
182 
183         [DllImport("Kernel32.dll", SetLastError = true, ExactSpelling = true)]
184         private static extern WAIT_RESULT WaitForSingleObject(IntPtr handle, Int32 milliseconds);
185 
186         [DllImport("Kernel32.dll", SetLastError = true)]
187         [return: MarshalAs(UnmanagedType.Bool)]
188         private static extern bool CloseHandle(IntPtr hObject);
189     }
190 
191     /// 
192     /// This interface definition is HACKED.
193     /// 
194     /// It appears that the IID for IXpsPrintJobStream specified in XpsPrint.h as 
195     /// MIDL_INTERFACE("7a77dc5f-45d6-4dff-9307-d8cb846347ca") is not correct and the RCW cannot return it.
196     /// But the returned object returns the parent ISequentialStream inteface successfully.
197     /// 
198     /// So the hack is that we obtain the ISequentialStream interface but work with it as 
199     /// with the IXpsPrintJobStream interface. 
200     /// 
201     [Guid("0C733A30-2A1C-11CE-ADE5-00AA0044773D")]  // This is IID of ISequenatialSteam.
202     [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
203     interface IXpsPrintJobStream
204     {
205         // ISequentualStream methods.
206         void Read([MarshalAs(UnmanagedType.LPArray)] byte[] pv, uint cb, out uint pcbRead);
207         void Write([MarshalAs(UnmanagedType.LPArray)] byte[] pv, uint cb, out uint pcbWritten);
208         // IXpsPrintJobStream methods.
209         void Close();
210     }
211 
212     [Guid("5ab89b06-8194-425f-ab3b-d7a96e350161")]
213     [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
214     interface IXpsPrintJob
215     {
216         void Cancel();
217         void GetJobStatus(out XPS_JOB_STATUS jobStatus);
218     }
219 
220     [StructLayout(LayoutKind.Sequential)]
221     struct XPS_JOB_STATUS
222     {
223         public UInt32 jobId;
224         public Int32 currentDocument;
225         public Int32 currentPage;
226         public Int32 currentPageTotal;
227         public XPS_JOB_COMPLETION completion;
228         public Int32 jobStatus; // UInt32
229     };
230 
231     enum XPS_JOB_COMPLETION
232     {
233         XPS_JOB_IN_PROGRESS = 0,
234         XPS_JOB_COMPLETED = 1,
235         XPS_JOB_CANCELLED = 2,
236         XPS_JOB_FAILED = 3
237     }
238 
239     enum WAIT_RESULT
240     {
241         WAIT_OBJECT_0 = 0,
242         WAIT_ABANDONED = 0x80,
243         WAIT_TIMEOUT = 0x102,
244         WAIT_FAILED = -1 // 0xFFFFFFFF
245     }
246 }

XpsPrintHelper

到此，基于windows服务的打印已经解决。

就只有模板编辑器的事情了。

对于原来做过基于Word的邮件合并域的经验。自己开发一个编辑器来说工程量有点大

所以选择了一个现有的，功能又强大的文档编辑器。Word来做为我的标签编辑器了。

Word可以完美的解决纸张，格式，位置等问题。只是在对应的地方用“文本域”来做占位符

然后用自定义的数据填充就可以了。

下图为Word模板编辑
技术图片

编辑占位符（域）
技术图片

这样的话。一个模板就出来了

如果是图片的话。就在域名前加Image:

如果是表格的话。在表格的开始加上TableStart:表名
在表格的未尾加上TableEnd:表名

协议的话。走的是所有语言都支持的http，对于以后开发SDK也方便

对于上面的模板，只要发送这样的请球POST
技术图片

对于Get请求

技术图片

然后打印出来的效果

技术图片

到此，打印3.0已经完成。

关键代码
根据请求数据生成打印实体

 1 private PrintModel GetPrintModel(HttpListenerRequest request)
 2         {
 3             var result = new PrintModel();
 4             result.PrintName = ConfigurationManager.AppSettings["PrintName"];
 5             result.Template = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Template", "Default.docx");
 6             result.Action = PrintActionType.Print;
 7 
 8             var query = request.Url.Query;
 9             var dicQuery = this.ToNameValueDictionary(query);
10             if (dicQuery.ContainsKey("PrintName")) result.PrintName = dicQuery["PrintName"];
11             if (dicQuery.ContainsKey("Copies")) result.Copies = int.Parse(dicQuery["Copies"]);
12             if (dicQuery.ContainsKey("Template"))
13             {
14                 var tempPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Template", dicQuery["Template"]);
15                 if (File.Exists(tempPath))
16                     result.Template = tempPath;
17             }
18             if (dicQuery.ContainsKey("Action")) result.Action = (PrintActionType)Enum.Parse(typeof(PrintActionType), dicQuery["Action"]);
19 
20             foreach (var item in dicQuery)
21             {
22                 if (item.Key.StartsWith("Image:"))
23                 {
24                     var keyName = item.Key.Replace("Image:", "");
25                     if (result.ImageContent.ContainsKey(keyName)) continue;
26                     var imageModel = item.Value.ToObject();
27                     result.ImageContent.Add(keyName, imageModel);
28                     continue;
29                 }
30                 if (item.Key.StartsWith("Table:"))
31                 {
32                     var keyName = item.Key.Replace("Table:", "");
33                     if (result.TableContent.ContainsKey(keyName)) continue;
34                     var table = item.Value.ToObject();
35                     table.TableName = keyName;
36                     result.TableContent.Add(keyName, table);
37                     continue;
38                 }
39                 if (result.FieldCotent.ContainsKey(item.Key)) continue;
40                 result.FieldCotent.Add(item.Key, item.Value);
41             }
42 
43             if (request.HttpMethod.Equals("POST", StringComparison.CurrentCultureIgnoreCase))
44             {
45                 var body = request.InputStream;
46                 var encoding = Encoding.UTF8;
47                 var reader = new StreamReader(body, encoding);
48                 var bodyContent = reader.ReadToEnd();
49                 var bodyModel = bodyContent.ToObjectstring, object>>();
50                 foreach (var item in bodyModel)
51                 {
52                     if (item.Key.StartsWith("Image:"))
53                     {
54                         var imageModel = item.Value.ToJson().ToObject();
55                         var keyName = item.Key.Replace("Image:", "");
56                         if (result.ImageContent.ContainsKey(keyName))
57                             result.ImageContent[keyName] = imageModel;
58                         else
59                             result.ImageContent.Add(keyName, imageModel);
60                         continue;
61                     }
62                     if (item.Key.StartsWith("Table:"))
63                     {
64                         var table = item.Value.ToJson().ToObject();
65                         var keyName = item.Key.Replace("Table:", "");
66                         table.TableName = keyName;
67                         if (result.TableContent.ContainsKey(keyName))
68                             result.TableContent[keyName] = table;
69                         else
70                             result.TableContent.Add(keyName, table);
71                         continue;
72                     }
73                     if (result.FieldCotent.ContainsKey(item.Key))
74                         result.FieldCotent[item.Key] = HttpUtility.UrlDecode(item.Value.ToString());
75                     else
76                         result.FieldCotent.Add(item.Key, HttpUtility.UrlDecode(item.Value.ToString()));
77                 }
78             }
79             return result;
80         }

GetPrintModel

文档邮件合并域

  1 public class MergeDocument : IDisposable
  2     {
  3         public PrintModel Model { get; set; }
  4         public Document Doc { get; set; }
  5         private PrintFieldMergingCallback FieldCallback { get; set; }
  6         public MergeDocument(PrintModel model)
  7         {
  8             this.Model = model;
  9             this.Doc = new Document(model.Template);
 10             this.FieldCallback = new PrintFieldMergingCallback(this.Model);
 11             this.Doc.MailMerge.FieldMergingCallback = this.FieldCallback;
 12         }
 13         public Stream MergeToStream()
 14         {
 15             if (this.Model.FieldCotent.Count > 0)
 16                 this.Doc.MailMerge.Execute(this.Model.FieldCotent.Keys.ToArray(), this.Model.FieldCotent.Values.ToArray());
 17             if (this.Model.ImageContent.Count > 0)
 18             {
 19                 this.Doc.MailMerge.Execute(this.Model.ImageContent.Keys.ToArray(), this.Model.ImageContent.Values.Select(s => s.Value).ToArray());
 20             };
 21             if (this.Model.TableContent.Count > 0)
 22             {
 23                 foreach (var item in this.Model.TableContent)
 24                 {
 25                     var table = item.Value;
 26                     table.TableName = item.Key;
 27                     this.Doc.MailMerge.ExecuteWithRegions(table);
 28                 }
 29             }
 30             this.Doc.UpdateFields();
 31 
 32             var fileName = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "PrintDoc", $"{DateTime.Now.ToString("yyMMddHHmmssfff")}.docx");
 33             var ms = new MemoryStream();
 34             this.Doc.Save(ms, SaveFormat.Xps);
 35             return ms;
 36         }
 37 
 38         public void Dispose()
 39         {
 40             this.FieldCallback.Dispose();
 41         }
 42 
 43         private class PrintFieldMergingCallback : IFieldMergingCallback, IDisposable
 44         {
 45             public HttpClient Client { get; set; }
 46             public PrintModel Model { get; set; }
 47             public PrintFieldMergingCallback(PrintModel model)
 48             {
 49                 this.Model = model;
 50                 this.Client = new HttpClient();
 51             }
 52             public void FieldMerging(FieldMergingArgs args)
 53             {
 54             }
 55 
 56             public void ImageFieldMerging(ImageFieldMergingArgs field)
 57             {
 58                 var fieldName = field.FieldName;
 59                 if (!this.Model.ImageContent.ContainsKey(fieldName)) return;
 60                 var imageModel = this.Model.ImageContent[fieldName];
 61                 switch (imageModel.Type)
 62                 {
 63                     case ImageType.Local:
 64                         {
 65                             field.Image = Image.FromFile(imageModel.Value);
 66                             field.ImageWidth = new MergeFieldImageDimension(imageModel.Width);
 67                             field.ImageHeight = new MergeFieldImageDimension(imageModel.Height);
 68                         };
 69                         break;
 70                     case ImageType.Network:
 71                         {
 72                             var imageStream = this.Client.GetStreamAsync(imageModel.Value).Result;
 73                             var ms = new MemoryStream();
 74                             imageStream.CopyTo(ms);
 75                             ms.Position = 0;
 76                             field.ImageStream = ms;
 77                             field.ImageWidth = new MergeFieldImageDimension(imageModel.Width);
 78                             field.ImageHeight = new MergeFieldImageDimension(imageModel.Height);
 79                         }; break;
 80                     case ImageType.BarCode:
 81                         {
 82                             var barImage = this.GenerateImage(BarcodeFormat.CODE_128, imageModel.Value, imageModel.Width, imageModel.Height);
 83                             field.Image = barImage;
 84                         }; break;
 85                     case ImageType.QRCode:
 86                         {
 87                             var qrImage = this.GenerateImage(BarcodeFormat.QR_CODE, imageModel.Value, imageModel.Width, imageModel.Height);
 88                             field.Image = qrImage;
 89                         }; break;
 90                     default: break;
 91                 }
 92             }
 93             private Bitmap GenerateImage(BarcodeFormat format, string code, int width, int height)
 94             {
 95                 var writer = new BarcodeWriter();
 96                 writer.Format = format;
 97                 EncodingOptions options = new EncodingOptions()
 98                 {
 99                     Width = width,
100                     Height = height,
101                     Margin = 2,
102                     PureBarcode = false

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文章标题：基于Win服务的标签打印(模板套打)
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