C#封装的一个串口操作类（可用于Win CE）

C#封装的一个串口操作类（可用于Win CE）(1)

using System;
using System.Runtime.InteropServices;

namespace NativeDll
{
 /// <summary>
 /// SerialPort 的摘要说明。
 /// </summary>
 public class SerialPort
 {
  #region 申明要引用的和串口调用有关的API
  //win32 api constants
  private const uint GENERIC_READ = 0x80000000;
  private const uint GENERIC_WRITE = 0x40000000;
  private const int OPEN_EXISTING = 3;      
  private const int INVALID_HANDLE_VALUE = -1;
  private const int MAXBLOCK = 4096;

  private const uint PURGE_TXABORT = 0x0001;  // Kill the pending/current writes to the comm port.
  private const uint PURGE_RXABORT = 0x0002;  // Kill the pending/current reads to the comm port.
  private const uint PURGE_TXCLEAR = 0x0004;  // Kill the transmit queue if there.
  private const uint PURGE_RXCLEAR = 0x0008;  // Kill the typeahead buffer if there.
      
  [StrUCtLayout(LayoutKind.Sequential)]
   private struct DCB 
  {
   //taken from c struct in platform sdk 
   public int DCBlength;           // sizeof(DCB) 
   public int BaudRate;            // current baud rate 
   public int fBinary;          // binary mode, no EOF check 
   public int fParity;          // enable parity checking 
   public int fOutxCtsFlow;      // CTS output flow control