#pragma once

#define WM_COMM_BREAK_DETECTED		WM_COMM_USER+1
#define WM_COMM_CTS_DETECTED		WM_COMM_USER+2
#define WM_COMM_DSR_DETECTED		WM_COMM_USER+3
#define WM_COMM_ERR_DETECTED		WM_COMM_USER+4
#define WM_COMM_RING_DETECTED		WM_COMM_USER+5
#define WM_COMM_RLSD_DETECTED		WM_COMM_USER+6
#define WM_COMM_RXCHAR				WM_COMM_USER+7
#define WM_COMM_RXFLAG_DETECTED		WM_COMM_USER+8
#define WM_COMM_TXEMPTY				WM_COMM_USER+9


class CSerialPort
{
public:
	CSerialPort(void);
	~CSerialPort(void);
private:
	DCB m_Dcb;
	UINT m_nBufferIn;
	UINT m_nBufferOut;
	COMMTIMEOUTS m_nTimeOut;
	volatile HANDLE m_hCommu;
	volatile UINT m_nPort;
	OVERLAPPED m_OvlpRead;
	OVERLAPPED m_OvlpWrite;
	//volatile HANDLE m_comHandle;
	void Init(void);
public:
	
	void Close(void);
private:
	// 記錄串口是否已經打開
	bool m_bOpen;
public:
	bool Open(UINT nPort,DWORD BaudRate=9600, BYTE ByteSize = 8, 
			  BYTE Parity = NOPARITY, BYTE StopBits = ONESTOPBIT);
	//call before opening the port
	void InitBufferSize(UINT nBufferIn, UINT nBufferOut);
	bool WriteData(BYTE* pWriteBuff, WORD nWrite);
				//發送數據時將清空發送和接收數據緩沖區，
				//并終止當前的發送和接收操作
	DWORD ReadData(BYTE* pReadBuff, WORD nRead);
	bool SetParityBit(BYTE nParity);
};