hwclasscom.h

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// COM.h: interface for the CHwClassCOM class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_COM_H__12A72EDD_A7FD_48A8_A0FC_AEBFCA2C5C25__INCLUDED_)
#define AFX_COM_H__12A72EDD_A7FD_48A8_A0FC_AEBFCA2C5C25__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000


#define MAX_COM_BUFSIZE 4096
#define INVALID_COM_NO	255		//无效的COM口
#define MAX_ANSWER_NUM	5		//发送应答码最大个数（一般是发1个字节）
#define MAX_RETYR_TIMES	5

class CHwClassCOM 
{
public:
	DWORD GetCommInputBuffLen();
	void ClearComm(BOOL bClearRead);
	int Write(LPVOID buf, DWORD dwSize);
	int Read(LPVOID buf,DWORD dwSize);
	BOOL WaitForDataToRead(int iBytes,int timeout = 5);
	CHwClassCOM();
	virtual ~CHwClassCOM();
	DWORD GetCommOutBufRemainBytes();

//属性
public:
	void ClearCommBufByRead();
	void Close();
	CString GetLastErrorString();
	virtual BOOL InitializeClass(int iComNO, int nBaudRate=56000);
	HANDLE m_handleCOM;
	int m_iComNO;
	
private:
	CString m_csError;
	COMMPROP m_CommProp;
	
};

#endif // !defined(AFX_COM_H__12A72EDD_A7FD_48A8_A0FC_AEBFCA2C5C25__INCLUDED_)