c#收发串口数据的源码(封装了windows api的类)

在网上找的代码，然后修改的。

//Comm.csusing System;using System.Runtime.InteropServices;namespace Comm{public class myCom{ #region WINAPI常量 /// <summary> /// 写标志 /// </summary> private const uint GENERIC_READ = 0x80000000; /// <summary> /// 读标志 /// </summary> private const uint GENERIC_WRITE = 0x40000000; /// <summary> /// 打开已存在 /// </summary> private const int OPEN_EXISTING = 3; /// <summary> /// 无效句柄 /// </summary> private const int INVALID_HANDLE_VALUE = -1; #endregion #region 成员变量 /// <summary> /// 端口名称(COM1,COM2...COM4...) /// </summary> public int PortNum; /// <summary> /// 波特率9600 /// </summary> public int BaudRate; /// <summary> /// 数据位4-8 /// </summary> public byte ByteSize; /// <summary> /// 奇偶校验0-4=no,odd,even,mark,space /// </summary> public byte Parity; /// <summary> /// 停止位 /// </summary> public byte StopBits; // 0,1,2 = 1, 1.5, 2 /// <summary> /// 超时长 /// </summary> public int ReadTimeout; /// <summary> /// COM口句柄 /// </summary> private int hComm = INVALID_HANDLE_VALUE; /// <summary> /// 串口是否已经打开 /// </summary> public bool Opened = false; #endregion /// <summary> /// 设备控制块结构体类型 /// </summary> [StructLayout(LayoutKind.Sequential)] public struct DCB { /// <summary> /// DCB长度 /// </summary> public int DCBlength; /// <summary> /// 指定当前波特率 /// </summary> public int BaudRate; /// <summary> /// 指定是否允许二进制模式 /// </summary> public int fBinary; /// <summary> /// 指定是否允许奇偶校验 /// </summary> public int fParity; /// <summary> /// 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。 /// </summary> public int fOutxCtsFlow; /// <summary> /// 指定CTS是否用于检测发送控制 /// </summary> public int fOutxDsrFlow; /// <summary> /// 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" /// </summary> public int fDtrControl; /// <summary> /// 当该值为TRUE时DSR为OFF时接收的字节被忽略 /// </summary> public int fDsrSensitivity; /// <summary> /// 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 /// </summary> public int fTXContinueOnXoff; /// <summary> /// 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 /// </summary> public int fOutX; /// <summary> /// 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 /// </summary> public int fInX; /// <summary> /// 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 /// </summary> public int fErrorChar; /// <summary> /// eTRUE时，接收时去掉空（0值）字节 enable null stripping /// </summary> public int fNull; /// <summary> /// 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 /// </summary> public int fRtsControl; /// <summary> /// TRUE时,有错误发生时中止读和写操作 abort on error /// </summary> public int fAbortOnError; /// <summary> /// 未使用 /// </summary> public int fDummy2; /// <summary> /// 标志位 /// </summary> public uint flags; /// <summary> /// 未使用,必须为0 /// </summary> public ushort wReserved; /// <summary> /// 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 /// </summary> public ushort XonLim; /// <summary> /// 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 /// </summary> public ushort XoffLim; /// <summary> /// 指定端口当前使用的数据位 /// </summary> public byte ByteSize; /// <summary> /// 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 /// </summary> public byte Parity; /// <summary> /// 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 /// </summary> public byte StopBits; /// <summary> /// 指定用于发送和接收字符XON的值 Tx and Rx XON character /// </summary> public char XonChar; /// <summary> /// 指定用于发送和接收字符XOFF值 Tx and Rx XOFF character /// </summary> public char XoffChar; /// <summary> /// 本字符用来代替接收到的奇偶校验发生错误时的值 /// </summary> public char ErrorChar; /// <summary> /// 当没有使用二进制模式时,本字符可用来指示数据的结束 /// </summary> public char EofChar; /// <summary> /// 当接收到此字符时,会产生一个事件 /// </summary> public char EvtChar; /// <summary> /// 未使用 /// </summary> public ushort wReserved1; } /// <summary> /// 串口超时时间结构体类型 /// </summary> [StructLayout(LayoutKind.Sequential)] private struct COMMTIMEOUTS { public int ReadIntervalTimeout; public int ReadTotalTimeoutMultiplier; public int ReadTotalTimeoutConstant; public int WriteTotalTimeoutMultiplier; public int WriteTotalTimeoutConstant; } /// <summary> /// 湓出缓冲区结构体类型 /// </summary> [StructLayout(LayoutKind.Sequential)] private struct OVERLAPPED { public int Internal; public int InternalHigh; public int Offset; public int OffsetHigh; public int hEvent; } /// <summary> /// 打开串口 /// </summary> /// <param name="lpFileName">要打开的串口名称</param> /// <param name="dwDesiredAccess">指定串口的访问方式，一般设置为可读可写方式</param> /// <param name="dwShareMode">指定串口的共享模式，串口不能共享，所以设置为0</param> /// <param name="lpSecurityAttributes">设置串口的安全属性，WIN9X下不支持，应设为NULL</param> /// <param name="dwCreationDisposition">对于串口通信，创建方式只能为OPEN_EXISTING</param> /// <param name="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</param> /// <param name="hTemplateFile">对于串口通信必须设置为NULL</param> [DllImport("kernel32.dll")] private static extern int CreateFile(string lpFileName, uint dwDesiredAccess, int dwShareMode, int lpSecurityAttributes, int dwCreationDisposition, int dwFlagsAndAttributes, int hTemplateFile); /// <summary> /// 得到串口状态 /// </summary> /// <param name="hFile">通信设备句柄</param> /// <param name="lpDCB">设备控制块DCB</param> [DllImport("kernel32.dll")] private static extern bool GetCommState(int hFile, ref DCB lpDCB); /// <summary> /// 建立串口设备控制块 /// </summary> /// <param name="lpDef">设备控制字符串</param> /// <param name="lpDCB">设备控制块</param> [DllImport("kernel32.dll")] private static extern bool BuildCommDCB(string lpDef, ref DCB lpDCB); /// <summary> /// 设置串口状态 /// </summary> /// <param name="hFile">通信设备句柄</param> /// <param name="lpDCB">设备控制块</param> [DllImport("kernel32.dll")] private static extern bool SetCommState(int hFile, ref DCB lpDCB); /// <summary> /// 读取串口超时时间 /// </summary> /// <param name="hFile">通信设备句柄</param> /// <param name="lpCommTimeouts">超时时间</param> [DllImport("kernel32.dll")] private static extern bool GetCommTimeouts(int hFile, ref COMMTIMEOUTS lpCommTimeouts); /// <summary> /// 设置串口超时时间 /// </summary> /// <param name="hFile">通信设备句柄</param> /// <param name="lpCommTimeouts">超时时间</param> [DllImport("kernel32.dll")] private static extern bool SetCommTimeouts(int hFile, ref COMMTIMEOUTS lpCommTimeouts); /// <summary> /// 读取串口数据 /// </summary> /// <param name="hFile">通信设备句柄</param> /// <param name="lpBuffer">数据缓冲区</param> /// <param name="nNumberOfBytesToRead">多少字节等待读取</param> /// <param name="lpNumberOfBytesRead">读取多少字节</param> /// <param name="lpOverlapped">溢出缓冲区</param> [DllImport("kernel32.dll")] private static extern bool ReadFile(int hFile, byte[] lpBuffer, int nNumberOfBytesToRead,ref int lpNumberOfBytesRead, ref OVERLAPPED lpOverlapped); /// <summary> /// 写串口数据 /// </summary> /// <param name="hFile">通信设备句柄</param> /// <param name="lpBuffer">数据缓冲区</param> /// <param name="nNumberOfBytesToWrite">多少字节等待写入</param> /// <param name="lpNumberOfBytesWritten">已经写入多少字节</param> /// <param name="lpOverlapped">溢出缓冲区</param> [DllImport("kernel32.dll")] private static extern bool WriteFile(int hFile, byte[] lpBuffer, int nNumberOfBytesToWrite,ref int lpNumberOfBytesWritten, ref OVERLAPPED lpOverlapped); [DllImport("kernel32.dll", SetLastError = true)] private static extern bool FlushFileBuffers(int hFile); [DllImport("kernel32.dll", SetLastError = true)] private static extern bool PurgeComm(int hFile, uint dwFlags); /// <summary> /// 关闭串口 /// </summary> /// <param name="hObject">通信设备句柄</param> [DllImport("kernel32.dll")] private static extern bool CloseHandle(int hObject); /// <summary> /// 得到串口最后一次返回的错误 /// </summary> [DllImport("kernel32.dll")] private static extern uint GetLastError(); /// <summary> /// 建立与串口的连接 /// </summary> public bool Open() { DCB dcbCommPort = new DCB(); COMMTIMEOUTS ctoCommPort = new COMMTIMEOUTS(); // 打开串口 hComm = CreateFile("COM" + PortNum, GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0); if (hComm == INVALID_HANDLE_VALUE) { return false; } // 设置通信超时时间 GetCommTimeouts(hComm, ref ctoCommPort); ctoCommPort.ReadTotalTimeoutConstant = ReadTimeout; ctoCommPort.ReadTotalTimeoutMultiplier = 0; ctoCommPort.WriteTotalTimeoutMultiplier = 0; ctoCommPort.WriteTotalTimeoutConstant = 0; SetCommTimeouts(hComm, ref ctoCommPort); // 设置串口 GetCommState(hComm, ref dcbCommPort); dcbCommPort.fOutxCtsFlow = 524800; dcbCommPort.BaudRate = BaudRate; dcbCommPort.flags = 0; dcbCommPort.flags |= 1; if (Parity > 0) { dcbCommPort.flags |= 2; } dcbCommPort.Parity = Parity; dcbCommPort.ByteSize = ByteSize; dcbCommPort.StopBits = StopBits; dcbCommPort.fOutxCtsFlow = 524800; if (!SetCommState(hComm, ref dcbCommPort)) { return false; } Opened = true; return true; } /// <summary> /// 关闭串口,结束通讯 /// </summary> public bool Close() { if (hComm != INVALID_HANDLE_VALUE) { CloseHandle(hComm); Opened = false; return true; } return false; } /// <summary> /// 读取串口返回的数据 /// </summary> /// <param name="NumBytes">数据长度</param> 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); return OutBytes; } else { return new byte[0]; } } /// <summary> /// 清空COM口缓冲区数据 /// </summary> /// <returns></returns> public bool ClearPortData() { if (hComm != INVALID_HANDLE_VALUE) { return PurgeComm(hComm, 0); } return false; } /// <summary> /// 向串口写数据 /// </summary> /// <param name="WriteBytes">数据数组</param> public int Write(byte[] WriteBytes) { bool result; if (hComm != INVALID_HANDLE_VALUE) { OVERLAPPED ovlCommPort = new OVERLAPPED(); int BytesWritten = 0; WriteFile(hComm, WriteBytes, WriteBytes.Length, ref BytesWritten, ref ovlCommPort); return BytesWritten; } else { return 0; } }}}