ESC/P打印：程序控制打印机自动进退纸

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:     }

 

标签: ESC/P,打印,自动进纸,自动退纸