短信收发类无错版JustinIO.cs

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 (!BuildCommDCB("9600,n,8,1  ", ref  dcbCommPort))
            //{
            //    throw (new ApplicationException("非法操作，不能打开串口！  "));
            //} 

            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;
  }
 }
}