happyhippy

这个世界的问题在于聪明人充满疑惑,而傻子们坚信不疑。--罗素
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打印连续纸张的时候,经常会遇到需要自动进退纸的功能,譬如下列场景:
1. 打印完一个小标;(自动进纸)
2. 用户撕断打印出来的小标;
3. (自动退纸,纸张归位) 接着打印下一个小标;

 

下列代码在爱普生LQ 730k打印机上测试通过:

   1: //使用示例
   2: new PrintDirect("PrinterName").PrintESC(1);//打印后进纸
   3: new PrintDirect("PrinterName").PrintESC(0);//打印前退纸

 

源代码:

   1:  
   2:     [StructLayout(LayoutKind.Sequential)]
   3:     public struct DOCINFO
   4:     {
   5:         [MarshalAs(UnmanagedType.LPWStr)]
   6:         public string pDocName;
   7:         [MarshalAs(UnmanagedType.LPWStr)]
   8:         public string pOutputFile;
   9:         [MarshalAs(UnmanagedType.LPWStr)]
  10:         public string pDataType;
  11:     }
  12:  
  13:     public class PrintDirect
  14:     {
  15:         private string PrintPort { get; set; }
  16:         public PrintDirect(string port)
  17:         {
  18:             this.PrintPort = port;
  19:         }
  20:  
  21:         [DllImport("winspool.drv", CharSet = CharSet.Unicode, ExactSpelling = false, CallingConvention = CallingConvention.StdCall)]
  22:         public static extern long OpenPrinter(string pPrinterName, ref IntPtr phPrinter, int pDefault);
  23:  
  24:         [DllImport("winspool.drv", CharSet = CharSet.Unicode, ExactSpelling = false, CallingConvention = CallingConvention.StdCall)]
  25:         public static extern long StartDocPrinter(IntPtr hPrinter, int Level, ref DOCINFO pDocInfo);
  26:  
  27:         [DllImport("winspool.drv", CharSet = CharSet.Unicode, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
  28:         public static extern long StartPagePrinter(IntPtr hPrinter);
  29:  
  30:         [DllImport("winspool.drv", CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
  31:         public static extern long WritePrinter(IntPtr hPrinter, string data, int buf, ref int pcWritten);
  32:  
  33:         [DllImport("winspool.drv", CharSet = CharSet.Unicode, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
  34:         public static extern long EndPagePrinter(IntPtr hPrinter);
  35:  
  36:         [DllImport("winspool.drv", CharSet = CharSet.Unicode, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
  37:         public static extern long EndDocPrinter(IntPtr hPrinter);
  38:  
  39:         [DllImport("winspool.drv", CharSet = CharSet.Unicode, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
  40:         public static extern long ClosePrinter(IntPtr hPrinter);
  41:  
  42:         public void PrintESC(int type)
  43:         {
  44:             System.IntPtr lhPrinter = new System.IntPtr();
  45:             DOCINFO di = new DOCINFO();
  46:             int pcWritten = 0;
  47:             di.pDocName = "进退纸Document";
  48:             di.pDataType = "RAW";
  49:  
  50:             try
  51:             {
  52:                 PrintDirect.OpenPrinter(this.PrintPort, ref lhPrinter, 0);
  53:                 if (lhPrinter == IntPtr.Zero)
  54:                 {
  55:                     MessageBox.Show(string.Format("没有连接打印机或者打印机端口不是{0}!", this.PrintPort),
  56:                         "提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
  57:                     return;
  58:                 }
  59:                 PrintDirect.StartDocPrinter(lhPrinter, 1, ref di);
  60:                 PrintDirect.StartPagePrinter(lhPrinter);
  61:                 string send = string.Empty;
  62:                 for (int j = 0; j < 3; j++)
  63:                 {
  64:                     switch (type)
  65:                     {
  66:                         case 0:
  67:                             send = "" + (char)(27) + (char)(64) + (char)(27) + 'j' + (char)(180);//退纸
  68:                             break;
  69:                         case 1:
  70:                             send = "" + (char)(27) + (char)(64) + (char)(27) + 'J' + (char)(180);//进纸
  71:                             break;
  72:                         case 2:
  73:                             send = "" + (char)(27) + (char)(64) + (char)(12);   //换行(未测试)
  74:                             break;
  75:                         default:
  76:                             send = "" + (char)(27) + (char)(64) + (char)(12);   //换行(未测试)
  77:                             break;
  78:                     }
  79:                     byte[] buf = new byte[80];
  80:                     for (int i = 0; i < send.Length; i++)
  81:                     {
  82:                         buf[i] = (byte)send[i];
  83:                     }
  84:                     PrintDirect.WritePrinter(lhPrinter, send, send.Length, ref pcWritten);
  85:                 }
  86:             }
  87:             catch (Exception e)
  88:             {
  89:                 MessageBox.Show(e.Message);
  90:             }
  91:             finally
  92:             {
  93:                 if (lhPrinter != IntPtr.Zero)
  94:                 {
  95:                     PrintDirect.EndPagePrinter(lhPrinter);
  96:                     PrintDirect.EndDocPrinter(lhPrinter);
  97:                     PrintDirect.ClosePrinter(lhPrinter);
  98:                 }
  99:             }
 100:         }
 101:     }

 

posted on 2011-06-26 00:00 Silent Void 阅读(...) 评论(...) 编辑 收藏