commport.txt

高手写的wince6.0下的串口程序

这是我项目中实际用的代码，你可以参考一下：

Code Snippet

    public class CommPort
    {
        /// <summary>
        /// 端口名称(COM1,COM2...COM4...)
        /// </summary>
        public string Port = "COM1:";
        /// <summary>
        /// 波特率9600
        /// </summary>
        public int BaudRate = 9600;
        /// <summary>
        /// 数据位4-8
        /// </summary>
        public byte ByteSize = 8; //4-8 
        /// <summary>
        /// 奇偶校验0-4=no,odd,even,mark,space 
        /// </summary>
        public byte Parity = 0;   //0-4=no,odd,even,mark,space 
        /// <summary>
        /// 停止位
        /// </summary>
        public byte StopBits = 0;   //0,1,2 = 1, 1.5, 2 
        /// <summary>
        /// 超时长
        /// </summary>
        public int ReadTimeout = 200;
        /// <summary>
        /// 串口是否已经打开
        /// </summary>
        public bool Opened = false;
        /// <summary>
        /// COM口句柄
        /// </summary>
        private int hComm = -1;

        #region "API相关定义"
        private const string DLLPATH = "\\windows\\coredll.dll"; // "kernel32";

        /// <summary>
        /// WINAPI常量,写标志
        /// </summary>
        private const uint GENERIC_READ = 0x80000000;
        /// <summary>
        /// WINAPI常量,读标志
        /// </summary>
        private const uint GENERIC_WRITE = 0x40000000;
        /// <summary>
        /// WINAPI常量,打开已存在
        /// </summary>
        private const int OPEN_EXISTING = 3;
        /// <summary>
        /// WINAPI常量,无效句柄
        /// </summary>
        private const int INVALID_HANDLE_VALUE = -1;

        private const int PURGE_RXABORT = 0x2;
        private const int PURGE_RXCLEAR = 0x8;
        private const int PURGE_TXABORT = 0x1;
        private const int PURGE_TXCLEAR = 0x4;

        /// <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;
            #region "标志"
            ///// <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;
            #endregion
            /// <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 byte XonChar;
            /// <summary>
            /// 指定用于发送和接收字符XOFF值 Tx and Rx XOFF character 
            /// </summary>
            public byte 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 byte 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 byte EofChar;
            /// <summary>
            /// 当接收到此字符时,会产生一个事件
            /// </summary>
            public byte 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>
        /// 溢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(DLLPATH)]
        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(DLLPATH)]
        private static extern bool GetCommState(int hFile, ref DCB lpDCB);

        /// <summary>
        /// 建立串口设备控制块(嵌入版没有)
        /// </summary>
        /// <param name="lpDef">设备控制字符串</param>
        /// <param name="lpDCB">设备控制块</param>
        //[DllImport(DLLPATH)]
        //private static extern bool BuildCommDCB(string lpDef, ref DCB lpDCB);

        /// <summary>