C#串口通讯.doc

C#串口通信打开串口： 函数原型：public void Open() 说明：打开事先设置好的端口 示例： using JustinIO; static JustinIO.CommPort ss_port = new JustinIO.CommPort(); ss_port.PortNum = COM1; /端口号 ss_port.BaudRate = 19200; /串口通信波特率 ss_port.ByteSize = 8; /数据位 ss_port.Parity = 0; /奇偶校验 ss_port.StopBits = 1;/停止位 ss_port.ReadTimeout = 1000; /读超时 try if (ss_port.Opened) ss_port.Close(); ss_port.Open(); /打开串口 else ss_port.Open();/打开串口 return true; catch(Exception e) MessageBox.Show(错误： + e.Message); return false; 写串口： 函数原型：public void Write(byte WriteBytes) WriteBytes 就是你的写入的字节，注意，字符串要转换成字节数组才能进行通信 示例： ss_port.Write(Encoding.ASCII.GetBytes(AT+CGMIr); /获取手机品牌 读串口： 函数原型：public byte Read(int NumBytes) NumBytes 读入缓存数，注意读取来的是字节数组，要实际应用中要进行字符转换 示例： string response = Encoding.ASCII.GetString(ss_port.Read(128); /读取128个字节缓存 关闭串口： 函数原型：ss_port.Close() 示例： ss_port.Close(); 整合代码： using System; using System.Runtime.InteropServices; namespace JustinIO class CommPort public int 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; / current baud rate /* these are the c struct bit fields, bit twiddle flag to set 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 uint flags; 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 ); DllImport(kernel32.dll) private static extern bool SetCommTimeouts( int hFile, / handle to comm device ref COMMTIMEOUTS lpCommTimeouts / time-out values ); DllImport(kernel32.dll) private static extern bool ReadFile( int hFile, / handle to file byte lpBuffer, / data buffer int nNumberOfBytesToRead, / number of bytes to read ref int lpNumberOfBytesRead, / number of bytes read ref OVERLAPPED lpOverlapped / overlapped buffer ); DllImport(kernel32.dll) private static extern bool WriteFile( int hFile, / handle to file byte lpBuffer, / data buffer int nNumberOfBytesToWrite, / number of bytes to write ref int lpNumberOfBytesWritten, / number of bytes written ref OVERLAPPED lpOverlapped / 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(); / OPEN THE COMM PORT. hComm = CreateFile(COM + PortNum ,GENERIC_READ | GENERIC_WRITE,0, 0,OPEN_EXISTING,0,0); / IF THE PORT CANNOT BE OPENED, BAIL OUT. if(hComm = INVALID_HANDLE_VALUE) throw(new ApplicationException(Comm Port Can Not Be Opened); / SET THE COMM TIMEOUTS. GetCommTimeouts(hComm,ref ctoCommPort); ctoCommPort.ReadTotalTimeoutConstant = ReadTimeout; ctoCommPort.ReadTotalTimeoutMultiplier = 0; ctoCommPort.WriteTotalTimeoutMultiplier = 0; ctoCommPort.WriteTotalTimeoutConstant = 0; SetCommTimeouts(hComm,ref ctoCommPort); / 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 (Parity0) /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(Comm Port Can Not Be Opened); /unremark to see if setting took correctly /DCB dcbCommPort2 = new DCB(); /GetCommState(hComm, ref dcbCommPort2); Opened = true; public void Close() if (hComm!=INVALI