串口通讯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 (!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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