Работа с последовательным портом. - C#

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Формулировка задачи:

Коллеги...подскажите пожалуйста.Как из VS2005 в C#,работать споследовательным портом,если можно по-подробней. Может у кого нить есть хорошее описание пространств имен System.IO.Ports ? а то никакой информации не нашел,желательно с примерами. Проблема в общем вот какая, нужно написать программу на C# для работы с промышленным контроллером нашего производства(модуль вода -вывода).Этот модуль работает в протоколе modbus rtu.Програма должна выполнять его первоначальную настройку.То есть подключаем его к COM порту компа,запускаем прогу и настраиваем...меняем уставки вводим в ячейки памяти контроллера необходимые значения,а так же считываем с него информацию разного рода из его ячеек.Все это надо делать через последовательные порт,а как с ним работать в C#???

Решение задачи: «Работа с последовательным портом.»

textual
Листинг программы 
using System;
using System.Windows.Forms;
using System.IO;
using System.Data;
using System.Runtime.InteropServices;
 
public int Download(byte[] Buffer, int Length)
  {
   IntPtr hPort=(IntPtr)Win32Com.INVALID_HANDLE_VALUE;
   IntPtr ptrUWO = IntPtr.Zero;
   Win32Com.DCB PortDCB = new Win32Com.DCB();
   Win32Com.COMMTIMEOUTS CommTimeouts = new Win32Com.COMMTIMEOUTS();
    
   
   hPort = Win32Com.CreateFile("COM1:", Win32Com.GENERIC_READ | Win32Com.GENERIC_WRITE, 0, IntPtr.Zero,
     Win32Com.OPEN_EXISTING, 0, IntPtr.Zero);
   
    if (hPort == (IntPtr)Win32Com.INVALID_HANDLE_VALUE) 
    {
     Put_Error("Error:COM1 port could not be opened!");
     return -1;
    }
    else  
    {//порт не занят
     Win32Com.GetCommState(hPort,ref PortDCB);
     //заполняем нужные поля
     PortDCB.BaudRate=38400;//скорость передачи
     PortDCB.ByteSize = 8;//размер бита
     PortDCB.Parity = 0;//no parity
     PortDCB.StopBits = 0; //1 stopbit
     if (!Win32Com.SetCommState(hPort, ref PortDCB))
     {
      Put_Error("Error:COM1 port could not be opened!");
      return -1;
     }
     uint sent = 0;
     if((!Win32Com.WriteFile(hPort,Buffer,(uint)Length,out sent,ptrUWO))||(Length!=(int)sent))
     
    {
      Put_Error("Error:Can't write file into COM1 port!");
      return -1;
     
     }
     //закрываем порт
     Win32Com.CancelIo(hPort);
     if (!Win32Com.CloseHandle(hPort))
     {
      Put_Error("Warning:Can't close COM1 port!");
      return -1;
     
     }
     
    }
 
   
   return 1;
  }
 }
 internal class Win32Com 
 {
  /// <summary>
  /// Opening Testing and Closing the Port Handle.
  /// </summary>
  [DllImport("kernel32.dll", SetLastError=true)]
  internal static extern IntPtr CreateFile(String lpFileName, UInt32 dwDesiredAccess, UInt32 dwShareMode,
   IntPtr lpSecurityAttributes, UInt32 dwCreationDisposition, UInt32 dwFlagsAndAttributes,
   IntPtr hTemplateFile);
  //Constants for errors:
  internal const UInt32 ERROR_FILE_NOT_FOUND = 2;
  internal const UInt32 ERROR_INVALID_NAME = 123;
  internal const UInt32 ERROR_ACCESS_DENIED = 5;
  internal const UInt32 ERROR_IO_PENDING = 997;
  //Constants for return value:
  internal const Int32 INVALID_HANDLE_VALUE = -1;
  //Constants for dwFlagsAndAttributes:
  internal const UInt32 FILE_FLAG_OVERLAPPED = 0x40000000;
  //Constants for dwCreationDisposition:
  internal const UInt32 OPEN_EXISTING = 3;
  //Constants for dwDesiredAccess:
  internal const UInt32 GENERIC_READ = 0x80000000;
  internal const UInt32 GENERIC_WRITE = 0x40000000;
  [DllImport("kernel32.dll")]
  internal static extern Boolean CloseHandle(IntPtr hObject);
  /// <summary>
  /// Manipulating the communications settings.
  /// </summary>
  [DllImport("kernel32.dll")]
  internal static extern Boolean GetCommState(IntPtr hFile, ref DCB lpDCB);
  [DllImport("kernel32.dll")]
  internal static extern Boolean GetCommTimeouts(IntPtr hFile, out COMMTIMEOUTS lpCommTimeouts);
  [DllImport("kernel32.dll")]
  internal static extern Boolean BuildCommDCBAndTimeouts(String lpDef, ref DCB lpDCB, ref COMMTIMEOUTS lpCommTimeouts);
  [DllImport("kernel32.dll")]
  internal static extern Boolean SetCommState(IntPtr hFile, [In] ref DCB lpDCB);
  [DllImport("kernel32.dll")]
  internal static extern Boolean SetCommTimeouts(IntPtr hFile, [In] ref COMMTIMEOUTS lpCommTimeouts);
  [DllImport("kernel32.dll")]
  internal static extern Boolean SetupComm(IntPtr hFile, UInt32 dwInQueue, UInt32 dwOutQueue);
  [StructLayout( LayoutKind.Sequential )] internal struct COMMTIMEOUTS 
  {
   //JH1.1: Changed Int32 to UInt32 to allow setting to MAXDWORD
   internal UInt32 ReadIntervalTimeout;
   internal UInt32 ReadTotalTimeoutMultiplier;
   internal UInt32 ReadTotalTimeoutConstant;
   internal UInt32 WriteTotalTimeoutMultiplier;
   internal UInt32 WriteTotalTimeoutConstant;
  }
  //JH1.1: Added to enable use of "return immediately" timeout.
  internal const UInt32 MAXDWORD = 0xffffffff;
  [StructLayout( LayoutKind.Sequential )] internal struct DCB 
  {
   internal Int32 DCBlength;
   internal Int32 BaudRate;
   internal Int32 PackedValues;
   internal Int16 wReserved;
   internal Int16 XonLim;
   internal Int16 XoffLim;
   internal Byte  ByteSize;
   internal Byte  Parity;
   internal Byte  StopBits;
   internal Byte XonChar;
   internal Byte XoffChar;
   internal Byte ErrorChar;
   internal Byte EofChar;
   internal Byte EvtChar;
   internal Int16 wReserved1;
   internal void init(bool parity, bool outCTS, bool outDSR, int dtr, bool inDSR, bool txc, bool xOut,
    bool xIn, int rts)
   {
    DCBlength = 28; PackedValues = 0x8001;
    if (parity) PackedValues |= 0x0002;
    if (outCTS) PackedValues |= 0x0004;
    if (outDSR) PackedValues |= 0x0008;
    PackedValues |= ((dtr & 0x0003) << 4);
    if (inDSR) PackedValues |= 0x0040;
    if (txc) PackedValues |= 0x0080;
    if (xOut) PackedValues |= 0x0100;
    if (xIn) PackedValues |= 0x0200;
    PackedValues |= ((rts & 0x0003) << 12);
   }
  }
  /// <summary>
  /// Reading and writing.
  /// </summary>
  [DllImport("kernel32.dll", SetLastError=true)]
  internal static extern Boolean WriteFile(IntPtr fFile, Byte[] lpBuffer, UInt32 nNumberOfBytesToWrite,
   out UInt32 lpNumberOfBytesWritten, IntPtr lpOverlapped);
  [StructLayout( LayoutKind.Sequential )] internal struct OVERLAPPED 
  {
   internal UIntPtr Internal;
   internal UIntPtr InternalHigh;
   internal UInt32 Offset;
   internal UInt32 OffsetHigh;
   internal IntPtr hEvent;
  }
  [DllImport("kernel32.dll")]
  internal static extern Boolean SetCommMask(IntPtr hFile, UInt32 dwEvtMask);
  // Constants for dwEvtMask:
  internal const UInt32 EV_RXCHAR = 0x0001;
  internal const UInt32 EV_RXFLAG = 0x0002;
  internal const UInt32 EV_TXEMPTY = 0x0004;
  internal const UInt32 EV_CTS = 0x0008;
  internal const UInt32 EV_DSR = 0x0010;
  internal const UInt32 EV_RLSD = 0x0020;
  internal const UInt32 EV_BREAK = 0x0040;
  internal const UInt32 EV_ERR = 0x0080;
  internal const UInt32 EV_RING = 0x0100;
  internal const UInt32 EV_PERR = 0x0200;
  internal const UInt32 EV_RX80FULL = 0x0400;
  internal const UInt32 EV_EVENT1 = 0x0800;
  internal const UInt32 EV_EVENT2 = 0x1000;
  [DllImport("kernel32.dll", SetLastError=true)]
  internal static extern Boolean WaitCommEvent(IntPtr hFile, IntPtr lpEvtMask, IntPtr lpOverlapped);
  [DllImport("kernel32.dll")]
  internal static extern Boolean CancelIo(IntPtr hFile);
  
  [DllImport("kernel32.dll", SetLastError=true)]
  internal static extern Boolean ReadFile(IntPtr hFile, [Out] Byte[] lpBuffer, UInt32 nNumberOfBytesToRead,
   out UInt32 nNumberOfBytesRead, IntPtr lpOverlapped);
  [DllImport("kernel32.dll")]
  internal static extern Boolean TransmitCommChar(IntPtr hFile, Byte cChar);
  /// <summary>
  /// Control port functions.
  /// </summary>
  [DllImport("kernel32.dll")]
  internal static extern Boolean EscapeCommFunction(IntPtr hFile, UInt32 dwFunc);
  // Constants for dwFunc:
  internal const UInt32 SETXOFF = 1;
  internal const UInt32 SETXON = 2;
  internal const UInt32 SETRTS = 3;
  internal const UInt32 CLRRTS = 4;
  internal const UInt32 SETDTR = 5;
  internal const UInt32 CLRDTR = 6;
  internal const UInt32 RESETDEV = 7;
  internal const UInt32 SETBREAK = 8;
  internal const UInt32 CLRBREAK = 9;
  
  [DllImport("kernel32.dll")]
  internal static extern Boolean GetCommModemStatus(IntPtr hFile, out UInt32 lpModemStat);
  // Constants for lpModemStat:
  internal const UInt32 MS_CTS_ON = 0x0010;
  internal const UInt32 MS_DSR_ON = 0x0020;
  internal const UInt32 MS_RING_ON = 0x0040;
  internal const UInt32 MS_RLSD_ON = 0x0080;
  /// <summary>
  /// Status Functions.
  /// </summary>
  [DllImport("kernel32.dll", SetLastError=true)]
  internal static extern Boolean GetOverlappedResult(IntPtr hFile, IntPtr lpOverlapped,
   out UInt32 nNumberOfBytesTransferred, Boolean bWait);
  [DllImport("kernel32.dll")]
  internal static extern Boolean ClearCommError(IntPtr hFile, out UInt32 lpErrors, IntPtr lpStat);
  [DllImport("kernel32.dll")]
  internal static extern Boolean ClearCommError(IntPtr hFile, out UInt32 lpErrors, out COMSTAT cs);
  //Constants for lpErrors:
  internal const UInt32 CE_RXOVER = 0x0001;
  internal const UInt32 CE_OVERRUN = 0x0002;
  internal const UInt32 CE_RXPARITY = 0x0004;
  internal const UInt32 CE_FRAME = 0x0008;
  internal const UInt32 CE_BREAK = 0x0010;
  internal const UInt32 CE_TXFULL = 0x0100;
  internal const UInt32 CE_PTO = 0x0200;
  internal const UInt32 CE_IOE = 0x0400;
  internal const UInt32 CE_DNS = 0x0800;
  internal const UInt32 CE_OOP = 0x1000;
  internal const UInt32 CE_MODE = 0x8000;
  [StructLayout( LayoutKind.Sequential )] internal struct COMSTAT 
  {
   internal const uint fCtsHold = 0x1;
   internal const uint fDsrHold = 0x2;
   internal const uint fRlsdHold = 0x4;
   internal const uint fXoffHold = 0x8;
   internal const uint fXoffSent = 0x10;
   internal const uint fEof = 0x20;
   internal const uint fTxim = 0x40;
   internal UInt32 Flags;
   internal UInt32 cbInQue;
   internal UInt32 cbOutQue;
  }
  [DllImport("kernel32.dll")]
  internal static extern Boolean GetCommProperties(IntPtr hFile, out COMMPROP cp);
  [StructLayout( LayoutKind.Sequential )] internal struct COMMPROP
  {
   internal UInt16 wPacketLength; 
   internal UInt16 wPacketVersion; 
   internal UInt32 dwServiceMask; 
   internal UInt32 dwReserved1; 
   internal UInt32 dwMaxTxQueue; 
   internal UInt32 dwMaxRxQueue; 
   internal UInt32 dwMaxBaud; 
   internal UInt32 dwProvSubType; 
   internal UInt32 dwProvCapabilities; 
   internal UInt32 dwSettableParams; 
   internal UInt32 dwSettableBaud; 
   internal UInt16 wSettableData; 
   internal UInt16 wSettableStopParity; 
   internal UInt32 dwCurrentTxQueue; 
   internal UInt32 dwCurrentRxQueue; 
   internal UInt32 dwProvSpec1; 
   internal UInt32 dwProvSpec2; 
   internal Byte wcProvChar; 
  }
}

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