最近项目中要实现标签打印的功能，有几个条件
- 标签模板可以事先生成，用的是CodeSoft软件
- 标签模板里面有二维码
- 标签模板里面有一些变量，要求打印的时候自动填充
- 产线电脑上没有安装CodeSoft，即便安装也不能使用，因为没有License
从开始计划做标签打印开始，做了三套解决方案，难度和依赖条件各不相同
- 利用Excel
- CodeSoft API
- ZPL+Win32 API
- 利用Excel
这是一个半自动化的方案，主要想法是在Excel里面做好模板，变量的部分通过编写VBA脚本，读取SQL Server数据库里面的内容进行填充，填充好了之后，手动打印。缺点是没有办法生成二维码。 --- Pass
代码
Public Sub SynTableConfig() Dim cnn As New ADODB.Connection, sh As Worksheet Dim rs As New ADODB.Recordset Dim cnnStr As String, SQL As String '建立与SQL Server数据库服务器的连接 cnnStr = "Provider=SQLOLEDB;Initial Catalog=" & myDataBase & ";User ID=" & myname & ";Password=" & mypassword & ";Data Source=" & serverip cnn.ConnectionString = cnnStr cnn.Open SQL = "select * from sys_table where id='123' order by 表名称" Set rs = cnn.Execute(SQL) While Not rs.EOF ............. rs.MoveNext Wend rs.Close Set rs = Nothing cnn.Close Set cnn = Nothing End Sub
- CodeSoft API
CodeSoft企业版提供了ActiveX控件，可以在C#中添加对Lppx2.tlb的引用，调用相关API对CodeSoft编辑好的Label文件进行变量替换等操作，然后打印。编程难度不大，但是有个致命限制，要安装CodeSoft软件并插入usbkey。公司虽然买了license，但是仅限于工程师编辑Label模板文件，产线电脑上没有安装软件，更不可能插入usbkey，因为很贵。--- Pass
代码如下
class CodeSoft { string _printerName = ""; public CodeSoft(string printerName) { _printerName = printerName; } public void Print(string labelFileName, Dictionary<string,string> parameters) { LabelManager2.Application labApp = null; LabelManager2.Document doc = null; string labFileName = System.Windows.Forms.Application.StartupPath + @"" + labelFileName; try { if (!File.Exists(labFileName)) { throw new FileNotFoundException("File not exsit", labFileName); } labApp = new LabelManager2.Application(); labApp.Documents.Open(labFileName, false); doc = labApp.ActiveDocument; doc.Printer.SwitchTo(_printerName); string printerName = labApp.ActivePrinterName; foreach (string parameterName in parameters.Keys) { doc.Variables.FormVariables.Item(parameterName).Value = parameters[parameterName]; } doc.PrintDocument(1); } catch (Exception ex) { throw ex; } finally { labApp.Documents.CloseAll(true); //doc.Quit(); doc = null; doc = null; GC.Collect(0); } } }
- ZPL+Win32 API
ZPL是Zebra公司的标签标记语言，描述了标签上有哪些内容，何种字体，何种颜色等等。大部分标签打印机应该都支持，最起码我们的430t是可以支持的。具体打印的思路是利用CodeSoft软件，生成一个PRN文件（具体怎么生成不知道）。PRN文件里面的内容就是用ZPL描述的标签。我用程序读入这个PRN文件，将里面的变量替换掉，生成一个新文件，然后调用系统Native的打印功能，进行打印。
代码如下
class PrinterHelper { // 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 = "My C#.NET RAW Document"; di.pDataType = "RAW"; // Open the printer. if (OpenPrinter(szPrinterName.Normalize(), 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 SendFileToPrinter(string szPrinterName, string szFileName, Dictionary<string, string> parameters) { string fileName = AssignValueToVariables(szFileName, parameters); return SendFileToPrinter(szPrinterName, fileName); } public static bool SendFileToPrinter(string szPrinterName, string szFileName) { // Open the file. FileStream fs = new FileStream(szFileName, FileMode.Open); // Create a BinaryReader on the file. BinaryReader br = new BinaryReader(fs); // Dim an array of bytes big enough to hold the file's contents. Byte[] bytes = new Byte[fs.Length]; bool bSuccess = false; // Your unmanaged pointer. IntPtr pUnmanagedBytes = new IntPtr(0); int nLength; nLength = Convert.ToInt32(fs.Length); // Read the contents of the file into the array. bytes = br.ReadBytes(nLength); // Allocate some unmanaged memory for those bytes. pUnmanagedBytes = Marshal.AllocCoTaskMem(nLength); // Copy the managed byte array into the unmanaged array. Marshal.Copy(bytes, 0, pUnmanagedBytes, nLength); // Send the unmanaged bytes to the printer. bSuccess = SendBytesToPrinter(szPrinterName, pUnmanagedBytes, nLength); // Free the unmanaged memory that you allocated earlier. Marshal.FreeCoTaskMem(pUnmanagedBytes); return bSuccess; } private static string AssignValueToVariables(string szFileName, Dictionary<string, string> parameters) { StreamReader sr = new StreamReader(szFileName, Encoding.Default); string line; StringBuilder sb = new StringBuilder(); while ((line = sr.ReadLine()) != null) { sb.AppendLine(line); } string newContent = UpdateVariable(sb.ToString(), parameters); return WriteToFile(szFileName, newContent); } private static string WriteToFile(string szFileName, string newContent) { string fullFileName = szFileName + ".new.PRN"; if (File.Exists(fullFileName)) { File.Delete(fullFileName); } using (FileStream fs = new FileStream(fullFileName, FileMode.Create)) { using (StreamWriter sw = new StreamWriter(fs)) { sw.Write(newContent); sw.Flush(); } } return fullFileName; } private static string UpdateVariable(string content, Dictionary<string, string> parameters) { string newContent = content; foreach (string parameterName in parameters.Keys) { string parameterValue = parameters[parameterName]; newContent = newContent.Replace(string.Format("_tag${0}$tag_", parameterName), parameterValue); } return newContent; } public static bool SendStringToPrinter(string szPrinterName, string szString) { IntPtr pBytes; Int32 dwCount; // How many characters are in the string? dwCount = szString.Length; // Assume that the printer is expecting ANSI text, and then convert // the string to ANSI text. pBytes = Marshal.StringToCoTaskMemAnsi(szString); // Send the converted ANSI string to the printer. SendBytesToPrinter(szPrinterName, pBytes, dwCount); Marshal.FreeCoTaskMem(pBytes); return true; } }