c#收發串口數據的源碼(封裝了windows api的類)

在網上找的代碼，然後修改的。

//Comm.cs using System; using System.Runtime.InteropServices; namespace Comm { public class myCom { #region WINAPI常量 /// <summary> /// 寫標誌 /// </summary> private const uint GENERIC_READ = 0x80000000; /// <summary> /// 讀標誌 /// </summary> private const uint GENERIC_WRITE = 0x40000000; /// <summary> /// 打開已存在 /// </summary> private const int OPEN_EXISTING = 3; /// <summary> /// 無效句柄 /// </summary> private const int INVALID_HANDLE_VALUE = -1; #endregion #region 成員變量 /// <summary> /// 端口名稱(COM1,COM2...COM4...) /// </summary> public int PortNum; /// <summary> /// 波特率9600 /// </summary> public int BaudRate; /// <summary> /// 數據位4-8 /// </summary> public byte ByteSize; /// <summary> /// 奇偶校驗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> /// 超時長 /// </summary> public int ReadTimeout; /// <summary> /// COM口句柄 /// </summary> private int hComm = INVALID_HANDLE_VALUE; /// <summary> /// 串口是否已經打開 /// </summary> public bool Opened = false; #endregion /// <summary> /// 設備控制塊結構體類型 /// </summary> [StructLayout(LayoutKind.Sequential)] public struct DCB { /// <summary> /// DCB長度 /// </summary> public int DCBlength; /// <summary> /// 指定當前波特率 /// </summary> public int BaudRate; /// <summary> /// 指定是否允許二進制模式 /// </summary> public int fBinary; /// <summary> /// 指定是否允許奇偶校驗 /// </summary> public int fParity; /// <summary> /// 指定CTS是否用於檢測發送控制，當爲TRUE是CTS爲OFF，發送將被掛起。 /// </summary> public int fOutxCtsFlow; /// <summary> /// 指定CTS是否用於檢測發送控制 /// </summary> public int fOutxDsrFlow; /// <summary> /// DTR_CONTROL_DISABLE值將DTR置爲OFF, DTR_CONTROL_ENABLE值將DTR置爲ON, DTR_CONTROL_HANDSHAKE允許DTR"握手" /// </summary> public int fDtrControl; /// <summary> /// 當該值爲TRUE時DSR爲OFF時接收的字節被忽略 /// </summary> public int fDsrSensitivity; /// <summary> /// 指定當接收緩衝區已滿,並且驅動程序已經發送出XoffChar字符時發送是否停止。 /// TRUE時，在接收緩衝區接收到緩衝區已滿的字節XoffLim且驅動程序已經發送出 /// XoffChar字符中止接收字節之後，發送繼續進行。　FALSE時，在接收緩衝區接 /// 收到代表緩衝區已空的字節XonChar且驅動程序已經發送出恢復發送的XonChar之 /// 後，發送繼續進行。XOFF continues Tx /// </summary> public int fTXContinueOnXoff; /// <summary> /// TRUE時，接收到XoffChar之後便停止發送接收到XonChar之後將重新開始 XON/XOFF /// out flow control /// </summary> public int fOutX; /// <summary> /// TRUE時，接收緩衝區接收到代表緩衝區滿的XoffLim之後，XoffChar發送出去接收 /// 緩衝區接收到代表緩衝區空的XonLim之後，XonChar發送出去 XON/XOFF in flow control /// </summary> public int fInX; /// <summary> /// 該值爲TRUE且fParity爲TRUE時，用ErrorChar 成員指定的字符代替奇偶校驗錯誤 /// 的接收字符 enable error replacement /// </summary> public int fErrorChar; /// <summary> /// eTRUE時，接收時去掉空（0值）字節 enable null stripping /// </summary> public int fNull; /// <summary> /// RTS flow control RTS_CONTROL_DISABLE時,RTS置爲OFF RTS_CONTROL_ENABLE時, RTS置爲ON /// RTS_CONTROL_HANDSHAKE時,當接收緩衝區小於半滿時RTS爲ON當接收緩衝區超過四分之 /// 三滿時RTS爲OFF RTS_CONTROL_TOGGLE時,當接收緩衝區仍有剩餘字節時RTS爲ON ,否則 /// 缺省爲OFF /// </summary> public int fRtsControl; /// <summary> /// TRUE時,有錯誤發生時中止讀和寫操作 abort on error /// </summary> public int fAbortOnError; /// <summary> /// 未使用 /// </summary> public int fDummy2; /// <summary> /// 標誌位 /// </summary> public uint flags; /// <summary> /// 未使用,必須爲0 /// </summary> public ushort wReserved; /// <summary> /// 指定在XON字符發送這前接收緩衝區中可允許的最小字節數 /// </summary> public ushort XonLim; /// <summary> /// 指定在XOFF字符發送這前接收緩衝區中可允許的最小字節數 /// </summary> public ushort XoffLim; /// <summary> /// 指定端口當前使用的數據位 /// </summary> public byte ByteSize; /// <summary> /// 指定端口當前使用的奇偶校驗方法,可能爲:EVENPARITY,MARKPARITY,NOPARITY,ODDPARITY 0-4=no,odd,even,mark,space /// </summary> public byte Parity; /// <summary> /// 指定端口當前使用的停止位數,可能爲:ONESTOPBIT,ONE5STOPBITS,TWOSTOPBITS 0,1,2 = 1, 1.5, 2 /// </summary> public byte StopBits; /// <summary> /// 指定用於發送和接收字符XON的值 Tx and Rx XON character /// </summary> public char XonChar; /// <summary> /// 指定用於發送和接收字符XOFF值 Tx and Rx XOFF character /// </summary> public char XoffChar; /// <summary> /// 本字符用來代替接收到的奇偶校驗發生錯誤時的值 /// </summary> public char ErrorChar; /// <summary> /// 當沒有使用二進制模式時,本字符可用來指示數據的結束 /// </summary> public char EofChar; /// <summary> /// 當接收到此字符時,會產生一個事件 /// </summary> public char EvtChar; /// <summary> /// 未使用 /// </summary> public ushort wReserved1; } /// <summary> /// 串口超時時間結構體類型 /// </summary> [StructLayout(LayoutKind.Sequential)] private struct COMMTIMEOUTS { public int ReadIntervalTimeout; public int ReadTotalTimeoutMultiplier; public int ReadTotalTimeoutConstant; public int WriteTotalTimeoutMultiplier; public int WriteTotalTimeoutConstant; } /// <summary> /// 湓出緩衝區結構體類型 /// </summary> [StructLayout(LayoutKind.Sequential)] private struct OVERLAPPED { public int Internal; public int InternalHigh; public int Offset; public int OffsetHigh; public int hEvent; } /// <summary> /// 打開串口 /// </summary> /// <param name="lpFileName">要打開的串口名稱</param> /// <param name="dwDesiredAccess">指定串口的訪問方式，一般設置爲可讀可寫方式</param> /// <param name="dwShareMode">指定串口的共享模式，串口不能共享，所以設置爲0</param> /// <param name="lpSecurityAttributes">設置串口的安全屬性，WIN9X下不支持，應設爲NULL</param> /// <param name="dwCreationDisposition">對於串口通信，創建方式只能爲OPEN_EXISTING</param> /// <param name="dwFlagsAndAttributes">指定串口屬性與標誌，設置爲FILE_FLAG_OVERLAPPED(重疊I/O操作)，指定串口以異步方式通信</param> /// <param name="hTemplateFile">對於串口通信必須設置爲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> /// 得到串口狀態 /// </summary> /// <param name="hFile">通信設備句柄</param> /// <param name="lpDCB">設備控制塊DCB</param> [DllImport("kernel32.dll")] private static extern bool GetCommState(int hFile, ref DCB lpDCB); /// <summary> /// 建立串口設備控制塊 /// </summary> /// <param name="lpDef">設備控制字符串</param> /// <param name="lpDCB">設備控制塊</param> [DllImport("kernel32.dll")] private static extern bool BuildCommDCB(string lpDef, ref DCB lpDCB); /// <summary> /// 設置串口狀態 /// </summary> /// <param name="hFile">通信設備句柄</param> /// <param name="lpDCB">設備控制塊</param> [DllImport("kernel32.dll")] private static extern bool SetCommState(int hFile, ref DCB lpDCB); /// <summary> /// 讀取串口超時時間 /// </summary> /// <param name="hFile">通信設備句柄</param> /// <param name="lpCommTimeouts">超時時間</param> [DllImport("kernel32.dll")] private static extern bool GetCommTimeouts(int hFile, ref COMMTIMEOUTS lpCommTimeouts); /// <summary> /// 設置串口超時時間 /// </summary> /// <param name="hFile">通信設備句柄</param> /// <param name="lpCommTimeouts">超時時間</param> [DllImport("kernel32.dll")] private static extern bool SetCommTimeouts(int hFile, ref COMMTIMEOUTS lpCommTimeouts); /// <summary> /// 讀取串口數據 /// </summary> /// <param name="hFile">通信設備句柄</param> /// <param name="lpBuffer">數據緩衝區</param> /// <param name="nNumberOfBytesToRead">多少字節等待讀取</param> /// <param name="lpNumberOfBytesRead">讀取多少字節</param> /// <param name="lpOverlapped">溢出緩衝區</param> [DllImport("kernel32.dll")] private static extern bool ReadFile(int hFile, byte[] lpBuffer, int nNumberOfBytesToRead,ref int lpNumberOfBytesRead, ref OVERLAPPED lpOverlapped); /// <summary> /// 寫串口數據 /// </summary> /// <param name="hFile">通信設備句柄</param> /// <param name="lpBuffer">數據緩衝區</param> /// <param name="nNumberOfBytesToWrite">多少字節等待寫入</param> /// <param name="lpNumberOfBytesWritten">已經寫入多少字節</param> /// <param name="lpOverlapped">溢出緩衝區</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> /// 關閉串口 /// </summary> /// <param name="hObject">通信設備句柄</param> [DllImport("kernel32.dll")] private static extern bool CloseHandle(int hObject); /// <summary> /// 得到串口最後一次返回的錯誤 /// </summary> [DllImport("kernel32.dll")] private static extern uint GetLastError(); /// <summary> /// 建立與串口的連接 /// </summary> public bool Open() { DCB dcbCommPort = new DCB(); COMMTIMEOUTS ctoCommPort = new COMMTIMEOUTS(); // 打開串口 hComm = CreateFile("COM" + PortNum, GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0); if (hComm == INVALID_HANDLE_VALUE) { return false; } // 設置通信超時時間 GetCommTimeouts(hComm, ref ctoCommPort); ctoCommPort.ReadTotalTimeoutConstant = ReadTimeout; ctoCommPort.ReadTotalTimeoutMultiplier = 0; ctoCommPort.WriteTotalTimeoutMultiplier = 0; ctoCommPort.WriteTotalTimeoutConstant = 0; SetCommTimeouts(hComm, ref ctoCommPort); // 設置串口 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> /// 關閉串口,結束通訊 /// </summary> public bool Close() { if (hComm != INVALID_HANDLE_VALUE) { CloseHandle(hComm); Opened = false; return true; } return false; } /// <summary> /// 讀取串口返回的數據 /// </summary> /// <param name="NumBytes">數據長度</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口緩衝區數據 /// </summary> /// <returns></returns> public bool ClearPortData() { if (hComm != INVALID_HANDLE_VALUE) { return PurgeComm(hComm, 0); } return false; } /// <summary> /// 向串口寫數據 /// </summary> /// <param name="WriteBytes">數據數組</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; } } } }