C#串口通讯类

串口通讯类：

using System;using System.Runtime.InteropServices;namespace JustinIO {
  class CommPort { public string PortNum;
  public int BaudRate;
  public byte ByteSize;
  public byte Parity; // 0-4=no,odd,even,mark,space
  public byte StopBits; // 0,1,2 = 1, 1.5, 2
  public int ReadTimeout;

//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)]
  public struct DCB {
  //taken from c struct in platform sdk
  public int DCBlength; // sizeof(DCB)
  public int BaudRate; // 指定当前波特率 current baud rate
  // these are the c struct bit fields, bit twiddle flag to set
  public int fBinary; // 指定是否允许二进制模式,在windows95中必须主TRUE binary mode, no EOF check
  public int fParity; // 指定是否允许奇偶校验 enable parity checking
  public int fOutxCtsFlow; // 指定CTS是否用于检测发送控制，当为TRUE是CTS为OFF，发送将被挂起。 CTS output flow control
  public int fOutxDsrFlow; // 指定CTS是否用于检测发送控制 DSR output flow control
  public int fDtrControl; // DTR_CONTROL_DISABLE值将DTR置为OFF, DTR_CONTROL_ENABLE值将DTR置为ON, DTR_CONTROL_HANDSHAKE允许DTR"握手" DTR flow control type
  public int fDsrSensitivity; // 当该值为TRUE时DSR为OFF时接收的字节被忽略 DSR sensitivity
  public int fTXContinueOnXoff; // 指定当接收缓冲区已满,并且驱动程序已经发送出XoffChar字符时发送是否停止。TRUE时，在接收缓冲区接收到缓冲区已满的字节XoffLim且驱动程序已经发送出XoffChar字符中止接收字节之后，发送继续进行。　FALSE时，在接收缓冲区接收到代表缓冲区已空的字节XonChar且驱动程序已经发送出恢复发送的XonChar之后，发送继续进行。XOFF continues Tx
  public int fOutX; // TRUE时，接收到XoffChar之后便停止发送接收到XonChar之后将重新开始 XON/XOFF out flow control
  public int fInX; // TRUE时，接收缓冲区接收到代表缓冲区满的XoffLim之后，XoffChar发送出去接收缓冲区接收到代表缓冲区空的XonLim之后，XonChar发送出去 XON/XOFF in flow control
  public int fErrorChar; // 该值为TRUE且fParity为TRUE时，用ErrorChar 成员指定的字符代替奇偶校验错误的接收字符 enable error replacement
  public int fNull; // eTRUE时，接收时去掉空（0值）字节 enable null stripping
  public int fRtsControl; // RTS flow control
  /*RTS_CONTROL_DISABLE时,RTS置为OFF
  　 RTS_CONTROL_ENABLE时, RTS置为ON
  　　 RTS_CONTROL_HANDSHAKE时,
  　　 当接收缓冲区小于半满时RTS为ON
  　 　 当接收缓冲区超过四分之三满时RTS为OFF
  　　 RTS_CONTROL_TOGGLE时,
  　　 当接收缓冲区仍有剩余字节时RTS为ON ,否则缺省为OFF*/ public int fAbortOnError; // TRUE时,有错误发生时中止读和写操作 abort on error
  public int fDummy2; // 未使用 reserved

public uint flags;
  public ushort wReserved; // 未使用,必须为0 not currently used
  public ushort XonLim; // 指定在XON字符发送这前接收缓冲区中可允许的最小字节数 transmit XON threshold
  public ushort XoffLim; // 指定在XOFF字符发送这前接收缓冲区中可允许的最小字节数 transmit XOFF threshold
  public byte ByteSize; // 指定端口当前使用的数据位 number of bits/byte, 4-8
  public byte Parity; // 指定端口当前使用的奇偶校验方法,可能为:EVENPARITY,MARKPARITY,NOPARITY,ODDPARITY 0-4=no,odd,even,mark,space
  public byte StopBits; // 指定端口当前使用的停止位数,可能为:ONESTOPBIT,ONE5STOPBITS,TWOSTOPBITS 0,1,2 = 1, 1.5, 2
  public char XonChar; // 指定用于发送和接收字符XON的值 Tx and Rx XON character
  public char XoffChar; // 指定用于发送和接收字符XOFF值 Tx and Rx XOFF character
  public char ErrorChar; // 本字符用来代替接收到的奇偶校验发生错误时的值 error replacement character
  public char EofChar; // 当没有使用二进制模式时,本字符可用来指示数据的结束 end of input character
  public char EvtChar; // 当接收到此字符时,会产生一个事件 received event character
  public ushort wReserved1; // 未使用 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, // 要打开的串口名称
  uint dwDesiredAccess, // 指定串口的访问方式，一般设置为可读可写方式
  int dwShareMode, // 指定串口的共享模式，串口不能共享，所以设置为0
  int lpSecurityAttributes, // 设置串口的安全属性，WIN9X下不支持，应设为NULL
  int dwCreationDisposition, // 对于串口通信，创建方式只能为OPEN_EXISTING
  int dwFlagsAndAttributes, // 指定串口属性与标志，设置为FILE_FLAG_OVERLAPPED(重叠I/O操作)，指定串口以异步方式通信
  int hTemplateFile // 对于串口通信必须设置为NULL
  );
  [DllImport("kernel32.dll")]
  private static extern bool GetCommState(
  int hFile, //通信设备句柄
  ref DCB lpDCB // 设备控制块DCB
  );
  [DllImport("kernel32.dll")]
  private static extern bool BuildCommDCB(
  string lpDef, // 设备控制字符串
  ref DCB lpDCB // 设备控制块
  );
  [DllImport("kernel32.dll")]
  private static extern bool SetCommState(
  int hFile, // 通信设备句柄
  ref DCB lpDCB // 设备控制块
  );
  [DllImport("kernel32.dll")]
  private static extern bool GetCommTimeouts(
  int hFile, // 通信设备句柄 handle to comm device
  ref COMMTIMEOUTS lpCommTimeouts // 超时时间 time-out values
  );
  [DllImport("kernel32.dll")]
  private static extern bool SetCommTimeouts(
  int hFile, // 通信设备句柄 handle to comm device
  ref COMMTIMEOUTS lpCommTimeouts // 超时时间 time-out values
  );
  [DllImport("kernel32.dll")]
  private static extern bool ReadFile(
  int hFile, // 通信设备句柄 handle to file
  byte[] lpBuffer, // 数据缓冲区 data buffer
  int nNumberOfBytesToRead, // 多少字节等待读取 number of bytes to read
  ref int lpNumberOfBytesRead, // 读取多少字节 number of bytes read
  ref OVERLAPPED lpOverlapped // 溢出缓冲区 overlapped buffer
  );
  [DllImport("kernel32.dll")]
  private static extern bool WriteFile(
  int hFile, // 通信设备句柄 handle to file
  byte[] lpBuffer, // 数据缓冲区 data buffer
  int nNumberOfBytesToWrite, // 多少字节等待写入 number of bytes to write
  ref int lpNumberOfBytesWritten, // 已经写入多少字节 number of bytes written
  ref OVERLAPPED lpOverlapped // 溢出缓冲区 overlapped buffer
  );
  [DllImport("kernel32.dll")]
  private static extern bool CloseHandle(
  int hObject // handle to object
  );
  [DllImport("kernel32.dll")]
  private static extern uint GetLastError();

public void Open()
  {

DCB dcbCommPort = new DCB();
  COMMTIMEOUTS ctoCommPort = new COMMTIMEOUTS();

// 打开串口 OPEN THE COMM PORT.
  hComm = CreateFile(PortNum ,GENERIC_READ | GENERIC_WRITE,0, 0,OPEN_EXISTING,0,0);
  // 如果串口没有打开，就打开 IF THE PORT CANNOT BE OPENED, BAIL OUT.
  if(hComm == INVALID_HANDLE_VALUE)
  {
  throw(new ApplicationException("非法操作，不能打开串口！"));
  }

// 设置通信超时时间 SET THE COMM TIMEOUTS.
  GetCommTimeouts(hComm,ref ctoCommPort);
  ctoCommPort.ReadTotalTimeoutConstant = ReadTimeout;
  ctoCommPort.ReadTotalTimeoutMultiplier = 0;
  ctoCommPort.WriteTotalTimeoutMultiplier = 0;
  ctoCommPort.WriteTotalTimeoutConstant = 0;
  SetCommTimeouts(hComm,ref ctoCommPort);

// 设置串口 SET BAUD RATE, PARITY, WORD SIZE, AND STOP BITS.
  GetCommState(hComm, ref dcbCommPort);
  dcbCommPort.BaudRate=BaudRate;
  dcbCommPort.flags=0;
  //dcb.fBinary=1;
  dcbCommPort.flags|=1;
  if (Parity>0)
  {
  //dcb.fParity=1
  dcbCommPort.flags|=2;
  }
  dcbCommPort.Parity=Parity;
  dcbCommPort.ByteSize=ByteSize;
  dcbCommPort.StopBits=StopBits;
  if (!SetCommState(hComm, ref dcbCommPort))
  {
  //uint ErrorNum=GetLastError();
  throw(new ApplicationException("非法操作，不能打开串口！"));
  }
  //unremark to see if setting took correctly
  //DCB dcbCommPort2 = new DCB();
  //GetCommState(hComm, ref dcbCommPort2);
  Opened = true;
  }

public void Close() {
  if (hComm!=INVALID_HANDLE_VALUE) {
  CloseHandle(hComm);
  }
  }

public byte[] Read(int NumBytes) {
  byte[] BufBytes;
  byte[] OutBytes;
  BufBytes = new byte[NumBytes];
  if (hComm!=INVALID_HANDLE_VALUE) {
  OVERLAPPED ovlCommPort = new OVERLAPPED();
  int BytesRead=0;
  ReadFile(hComm,BufBytes,NumBytes,ref BytesRead,ref ovlCommPort);
  OutBytes = new byte[BytesRead];
  Array.Copy(BufBytes,OutBytes,BytesRead);
  }
  else {
  throw(new ApplicationException("串口未打开！"));
  }
  return OutBytes;
  }

public void Write(byte[] WriteBytes) {
  if (hComm!=INVALID_HANDLE_VALUE) {
  OVERLAPPED ovlCommPort = new OVERLAPPED();
  int BytesWritten = 0;
  WriteFile(hComm,WriteBytes,WriteBytes.Length,ref BytesWritten,ref ovlCommPort);
  }
  else {
  throw(new ApplicationException("串口未打开！"));
  }
  }
  } class HexCon {
  // 把十六进制字符串转换成字节型和把字节型转换成十六进制字符串 converter hex string to byte and byte to hex string
  public static string ByteToString(byte[] InBytes) {
  string StringOut="";
  foreach (byte InByte in InBytes) {
  StringOut=StringOut + String.Format("{0:X2} ",InByte);
  }
  return StringOut;
  }
  public static byte[] StringToByte(string InString) {
  string[] ByteStrings;
  ByteStrings = InString.Split(" ".ToCharArray());
  byte[] ByteOut;
  ByteOut = new byte[ByteStrings.Length-1];
  for (int i = 0;i==ByteStrings.Length-1;i++) {
  ByteOut[i] = Convert.ToByte(("0x" + ByteStrings[i]));
  }
  return ByteOut;
  }
  }
  }

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