C#票据打印类

using System; using System.Collections.Generic; using System.Text; using System.IO; using System.Windows.Forms; using Microsoft.Win32.SafeHandles; using System.Runtime.InteropServices; using System.ComponentModel; namespace Comm { public class TicketPrinter { public const short FILE_ATTRIBUTE_NORMAL = 0x80; public const short INVALID_HANDLE_VALUE = -1; public const uint GENERIC_READ = 0x80000000; public const uint GENERIC_WRITE = 0x40000000; public const uint CREATE_NEW = 1; public const uint CREATE_ALWAYS = 2; public const uint OPEN_EXISTING = 3; [DllImport("inpout32.dll", EntryPoint = "Out32")] private static extern void Output(int adress, int value); [DllImport("inpout32.dll", EntryPoint = "Inp32")] private static extern int Input(int adress); private SafeFileHandle TicketPrinterHandle = null; [DllImport("kernel32.dll", SetLastError = true)] static extern SafeFileHandle CreateFile( string lpFileName, uint dwDesiredAccess, uint dwShareMode, IntPtr lpSecurityAttributes, uint dwCreationDisposition, uint dwFlagsAndAttributes, IntPtr hTemplateFile); [DllImport("kernel32.dll", SetLastError = true)] private static extern bool WriteFile( SafeFileHandle hFile, // handle to file char[] lpBuffer, // data buffer int nNumberOfBytesToWrite, // number of bytes to write out int lpNumberOfBytesWritten, // number of bytes written IntPtr lpOverlapped // overlapped buffer ); [DllImport("kernel32.dll", SetLastError = true)] private static extern bool CloseHandle( SafeFileHandle hObject // handle to object ); private string _PPort = ""; public string Status = "正在检测"; public TicketPrinter() { } public void Create( string LPTName ) { _PPort = ""; TicketPrinterHandle = CreateFile( LPTName, GENERIC_WRITE, 0, IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero); if (TicketPrinterHandle.IsInvalid) { MessageBox.Show("票据打印机口不能打开！"); return; } _PPort = LPTName; } public void Close() { if (TicketPrinterHandle == null) return; if (TicketPrinterHandle.IsInvalid) return; CloseHandle(TicketPrinterHandle); } public void Print(string str) { Print(str, "left"); } public void Print(string str, string align) { if (TicketPrinterHandle == null) return; if (TicketPrinterHandle.IsInvalid) return; int PadCount = 30; PadCount -= StrLen( str ); if (align == "center") str = str.PadLeft(PadCount / 2 + str.Length, ' '); else if (align == "right") str = str.PadLeft(PadCount, ' '); /**/////////////////////////////////////////////////////////// // 7 6 5 4 3 2 1 0 // Busy nAck Paper-Out Select nError x x x /**/////////////////////////////////////////////////////////// //check Parallel port Status registers int RetryCount = 10; Retry: int sta = 0; if (_PPort == "LPT1") sta = Input(0x379); else if (_PPort == "LPT2") sta = Input(0x279); if( sta == 0x7F ) { Status = "未连接"; return; } if ((sta & 0x10) == 0) { Status = "未上电"; return; } if ((sta & 0x80) == 0) //Busy { Status = "打印机忙"; RetryCount--; if (RetryCount <= 0) return; goto Retry; } if ((sta & 0x20) != 0) //Paper-Out { Status = "打印机缺纸"; return; }