using System;
using System.Drawing;
using System.Collections;
using System.Windows.Forms;
using System.Data;
using System.Runtime.InteropServices; 
using System.Threading;

namespace SerialAPI 
{ 
	/// <summary> 
	/// SerialPort 的摘要說明。 
	/// </summary> 
	public class SerialPort 
	{ 
		#region 申明要引用的和串口調用有關的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的成員變量 
		private int hComm = INVALID_HANDLE_VALUE; 
		private bool bOpened = false; 

		public bool Opened 
		{ 
			get 
			{ 
				return bOpened; 
			} 
		} 

		/// <summary> 
		///串口的初始化函數 
		///lpFileName 端口名 
		///baudRate 波特率 
		///parity 校驗位 
		///byteSize 數據位 
		///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;