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