C#封装的一个串口操作类（可用于Win CE）
2008-01-25 16:16
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| 作者：未知 来源：月光软件站 加入时间：2005-2-28 月光软件站 |
| using System; using System.Runtime.InteropServices; namespace NativeDll { /// <summary> /// SerialPort 的摘要说明。 /// </summary> public class SerialPort { #region 申明要引用的和串口调用有关的API //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; private const int MAXBLOCK = 4096; private const uint PURGE_TXABORT = 0x0001; // Kill the pending/current writes to the comm port. private const uint PURGE_RXABORT = 0x0002; // Kill the pending/current reads to the comm port. private const uint PURGE_TXCLEAR = 0x0004; // Kill the transmit queue if there. private const uint PURGE_RXCLEAR = 0x0008; // Kill the typeahead buffer if there. [StructLayout(LayoutKind.Sequential)] private struct DCB { //taken from c struct in platform sdk public int DCBlength; // sizeof(DCB) public int BaudRate; // current baud rate 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 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; } [StructLayout(LayoutKind.Sequential)] private struct COMSTAT { /*public int fCtsHold; public int fDsrHold; public int fRlsdHold; public int fXoffHold; public int fXoffSent; public int fEof; public int fTxim; public int fReserved; public int cbInQue; public int cbOutQue;*/ // Should have a reverse, i don't know why!!!!! public int cbOutQue; public int cbInQue; public int fReserved; public int fTxim; public int fEof; public int fXoffSent; public int fXoffHold; public int fRlsdHold; public int fDsrHold; public int fCtsHold; } #if FULLFRAMEWORK [DllImport("kernel32")] 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 ); #else [DllImport("coredll")] 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 ); #endif #if FULLFRAMEWORK [DllImport("kernel32")] private static extern bool GetCommState( int hFile, // handle to communications device ref DCB lpDCB // device-control block ); #else [DllImport("coredll")] private static extern bool GetCommState( int hFile, // handle to communications device ref DCB lpDCB // device-control block ); #endif #if FULLFRAMEWORK [DllImport("kernel32")] private static extern bool BuildCommDCB( string lpDef, // device-control string ref DCB lpDCB // device-control block ); #else [DllImport("coredll")] private static extern bool BuildCommDCB( string lpDef, // device-control string ref DCB lpDCB // device-control block ); #endif #if FULLFRAMEWORK [DllImport("kernel32")] private static extern bool SetCommState( int hFile, // handle to communications device ref DCB lpDCB // device-control block ); #else [DllImport("coredll")] private static extern bool SetCommState( int hFile, // handle to communications device ref DCB lpDCB // device-control block ); #endif #if FULLFRAMEWORK [DllImport("kernel32")] private static extern bool GetCommTimeouts( int hFile, // handle to comm device ref COMMTIMEOUTS lpCommTimeouts // time-out values ); #else [DllImport("coredll")] private static extern bool GetCommTimeouts( int hFile, // handle to comm device ref COMMTIMEOUTS lpCommTimeouts // time-out values ); #endif #if FULLFRAMEWORK [DllImport("kernel32")] private static extern bool SetCommTimeouts( int hFile, // handle to comm device ref COMMTIMEOUTS lpCommTimeouts // time-out values ); #else [DllImport("coredll")] private static extern bool SetCommTimeouts( int hFile, // handle to comm device ref COMMTIMEOUTS lpCommTimeouts // time-out values ); #endif #if FULLFRAMEWORK [DllImport("kernel32")] 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 ); #else [DllImport("coredll")] 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 ); #endif #if FULLFRAMEWORK [DllImport("kernel32")] 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 ); #else [DllImport("coredll")] 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 ); #endif #if FULLFRAMEWORK [DllImport("kernel32")] private static extern bool CloseHandle( int hObject // handle to object ); #else [DllImport("coredll")] private static extern bool CloseHandle( int hObject // handle to object ); #endif #if FULLFRAMEWORK [DllImport("kernel32")] private static extern bool ClearCommError( int hFile, // handle to file ref int lpErrors, ref COMSTAT lpStat ); #else [DllImport("coredll")] private static extern bool ClearCommError( int hFile, // handle to file ref int lpErrors, ref COMSTAT lpStat ); #endif #if FULLFRAMEWORK [DllImport("kernel32")] private static extern bool PurgeComm( int hFile, // handle to file uint dwFlags ); #else [DllImport("coredll")] private static extern bool PurgeComm( int hFile, // handle to file uint dwFlags ); #endif #if FULLFRAMEWORK [DllImport("kernel32")] private static extern bool SetupComm( int hFile, int dwInQueue, int dwOutQueue ); #else [DllImport("coredll")] private static extern bool SetupComm( int hFile, int dwInQueue, int dwOutQueue ); #endif #endregion // SerialPort的成员变量 private int hComm = INVALID_HANDLE_VALUE; private bool bOpened = false; public bool Opened { get { return bOpened; } } /// <summary> ///串口的初始化函数 ///lpFileName 端口名 ///baudRate 波特率 ///parity 校验位 ///byteSize 数据位 ///stopBits 停止位 /// <summary> public bool OpenPort(string lpFileName,int baudRate,byte parity, byte byteSize, byte stopBits) { // OPEN THE COMM PORT. hComm = CreateFile(lpFileName ,GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0); // IF THE PORT CANNOT BE OPENED, BAIL OUT. if(hComm == INVALID_HANDLE_VALUE) { return false; } SetupComm(hComm, MAXBLOCK, MAXBLOCK); // SET THE COMM TIMEOUTS. COMMTIMEOUTS ctoCommPort = new COMMTIMEOUTS(); GetCommTimeouts(hComm,ref ctoCommPort); ctoCommPort.ReadIntervalTimeout = Int32.MaxValue; ctoCommPort.ReadTotalTimeoutConstant = 0; ctoCommPort.ReadTotalTimeoutMultiplier = 0; ctoCommPort.WriteTotalTimeoutMultiplier = 10; ctoCommPort.WriteTotalTimeoutConstant = 1000; SetCommTimeouts(hComm,ref ctoCommPort); // SET BAUD RATE, PARITY, WORD SIZE, AND STOP BITS. // THERE ARE OTHER WAYS OF DOING SETTING THESE BUT THIS IS THE EASIEST. // IF YOU WANT TO LATER ADD CODE FOR OTHER BAUD RATES, REMEMBER // THAT THE ARGUMENT FOR BuildCommDCB MUST BE A POINTER TO A STRING. // ALSO NOTE THAT BuildCommDCB() DEFAULTS TO NO HANDSHAKING. DCB dcbCommPort = new DCB(); dcbCommPort.DCBlength = Marshal.SizeOf(dcbCommPort); GetCommState(hComm, ref dcbCommPort); dcbCommPort.BaudRate = baudRate; dcbCommPort.Parity = parity; dcbCommPort.ByteSize = byteSize; dcbCommPort.StopBits = stopBits; SetCommState(hComm, ref dcbCommPort); PurgeComm(hComm, PURGE_RXCLEAR | PURGE_RXABORT); PurgeComm(hComm, PURGE_TXCLEAR | PURGE_TXABORT); bOpened = true; return true; } // 关闭串口 public bool ClosePort() { if (hComm == INVALID_HANDLE_VALUE) { return false; } if (CloseHandle(hComm)) { hComm = INVALID_HANDLE_VALUE; bOpened = false; return true; } else { return false; } } // 往串口写数据 public bool WritePort(byte[] WriteBytes) { if (hComm == INVALID_HANDLE_VALUE) { return false; } COMSTAT ComStat = new COMSTAT(); int dwErrorFlags = 0; ClearCommError(hComm, ref dwErrorFlags, ref ComStat); if (dwErrorFlags != 0) PurgeComm(hComm, PURGE_TXCLEAR | PURGE_TXABORT); OVERLAPPED ovlCommPort = new OVERLAPPED(); int BytesWritten = 0; return WriteFile(hComm, WriteBytes, WriteBytes.Length, ref BytesWritten, ref ovlCommPort); } // 从串口读数据 public bool ReadPort(int NumBytes, ref byte[] commRead) { if (hComm == INVALID_HANDLE_VALUE) { return false; } COMSTAT ComStat = new COMSTAT(); int dwErrorFlags = 0; ClearCommError(hComm, ref dwErrorFlags, ref ComStat); if (dwErrorFlags != 0) PurgeComm(hComm, PURGE_RXCLEAR | PURGE_RXABORT); if (ComStat.cbInQue > 0) { OVERLAPPED ovlCommPort = new OVERLAPPED(); int BytesRead = 0; return ReadFile(hComm, commRead, NumBytes, ref BytesRead, ref ovlCommPort); } else { return false; } } } } |
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