using System;

namespace chuankou { /// /// Class1 的摘要说明。 /// class send { /// /// 应用程序的主入口点。 /// [STAThread] static void Main(string[] args) { // // TODO: 在此处添加代码以启动应用程序 // chuankou.CommPort ss_port = new chuankou.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) {         Console.WriteLine("错误：" + e.Message); //return false; } try {         ss_port.Write(System.Text.Encoding.Default.GetBytes("xxxxxxxxxxxxx")); } catch(Exception e) {         Console.WriteLine("错误：" + e.Message); //return false; } Console.WriteLine("输出完毕"); Console.ReadLine();

} }

}

类文件

using System; using System.Runtime.InteropServices;

namespace chuankou { /// /// io 的摘要说明。 /// 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; } } }