C#串口通信编程类(修改版)

这是从网上down下来的一个串口通信类，发现close函数忘记了设置Opened属性为false
还有后面string转byte[]和byte[]转string的函数有错误，索性删掉了
修改后的串口通信类如下：
下一篇将把我的测试程序主程序部分全部代码贴出来
可以坚强勇敢的用来实现串口通信。

using System;
using System.Runtime.InteropServices;

namespace BusApp
{
/// <summary>
///
/// </summary>
public class mycom
{
public mycom()
{
   //
   // TODO: 在此处添加构造函数逻辑
   //
}
public int PortNum; //1,2,3,4
public int BaudRate; //1200,2400,4800,9600
public byte ByteSize; //8 bits
public byte Parity; // 0-4=no,odd,even,mark,space
public byte StopBits; // 0,1,2 = 1, 1.5, 2
public int ReadTimeout; //10

//comm port win32 file handle
private int hComm = -1;

public bool Opened = false;

//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;

[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
   public int fOutxDsrFlow;      // DSR output flow control
   public int fDtrControl;       // DTR flow control type
   public int fDsrSensitivity;   // DSR sensitivity
   public int fTXContinueOnXoff; // XOFF continues Tx
   public int fOutX;          // XON/XOFF out flow control
   public int fInX;           // XON/XOFF in flow control
   public int fErrorChar;     // enable error replacement
   public int fNull;          // enable null stripping
   public int fRtsControl;     // RTS flow control
   public int fAbortOnError;   // abort on error
   public int fDummy2;        // reserved
   public ushort wReserved;          // not currently used
   public ushort XonLim;             // transmit XON threshold
   public ushort XoffLim;            // transmit XOFF threshold
   public byte ByteSize;           // number of bits/byte, 4-8
   public byte Parity;             // 0-4=no,odd,even,mark,space
   public byte StopBits;           // 0,1,2 = 1, 1.5, 2
   public char XonChar;            // Tx and Rx XON character
   public char XoffChar;           // Tx and Rx XOFF character
   public char ErrorChar;          // error replacement character
   public char EofChar;            // end of input character
   public char EvtChar;            // received event character
   public ushort wReserved1;         // reserved; do not use
}

[StructLayout(LayoutKind.Sequential)]
   private struct COMMTIMEOUTS
{
   public int ReadIntervalTimeout;
   public int ReadTotalTimeoutMultiplier;
   public int ReadTotalTimeoutConstant;
   public int WriteTotalTimeoutMultiplier;
   public int WriteTotalTimeoutConstant;
}

[StructLayout(LayoutKind.Sequential)]
   private struct OVERLAPPED
{
   public int Internal;
   public int InternalHigh;
   public int Offset;
   public int OffsetHigh;
   public int hEvent;
}

[DllImport("kernel32.dll")]
private static extern int CreateFile(
   string lpFileName,                         // file name
   uint dwDesiredAccess,                      // access mode
   int dwShareMode,                          // share mode
   int lpSecurityAttributes, // SD
   int dwCreationDisposition,                // how to create
   int dwFlagsAndAttributes,                 // file attributes
   int hTemplateFile                        // handle to template file
   );
[DllImport("kernel32.dll")]
private static extern bool GetCommState(
   int hFile, // handle to communications device
   ref DCB lpDCB    // device-control block
   );
[DllImport("kernel32.dll")]
private static extern bool BuildCommDCB(
   string lpDef, // device-control string
   ref DCB lpDCB     // device-control block
   );
[DllImport("kernel32.dll")]
private static extern bool SetCommState(
   int hFile, // handle to communications device
   ref DCB lpDCB    // device-control block
   );
[DllImport("kernel32.dll")]
private static extern bool GetCommTimeouts(
   int hFile,                  // handle to comm device
   ref COMMTIMEOUTS lpCommTimeouts // time-out values
补充：软件开发 , C# ,