comaccess.h

利用vb进行串口编程书籍以及配套书籍源代码

// ComAccess.h: interface for the CComAccess class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_COMACCESS_H__F15FFC6E_D059_4E57_97CD_A672C05FF9B7__INCLUDED_)
#define AFX_COMACCESS_H__F15FFC6E_D059_4E57_97CD_A672C05FF9B7__INCLUDED_

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


class CComAccess 
{
private:

	HANDLE      m_hCom; // Device handle 

	OVERLAPPED  m_ov;   // A structure that contains informations which are
	                    // used for asynchronous input and output operations

	TCHAR       m_lpszErrorMessage[256];

public:

	CComAccess();
	CComAccess(LPCSTR lpszPortNum);

	~CComAccess();
			                        // For more definitions see <winbase.h>
	BOOL	Open(LPCSTR lpszPortNum	= "com1",
			     DWORD  dwBaudRate  = CBR_9600, 
			     BYTE   byParity    = NOPARITY,
			     BYTE   byStopBits  = ONESTOPBIT,
			     BYTE   byByteSize  = 8);

	VOID	Close();
	
	DWORD	WriteData(LPCVOID pdata, DWORD len);
	DWORD	ReadData(LPVOID  pdest, DWORD len, DWORD dwMaxWait = 500);

	LPSTR	GetErrorMessage(VOID) { return m_lpszErrorMessage; }

private:

	VOID	ErrorToString(LPCSTR lpszMessage);

	BOOL	IsNT(VOID);
};

#endif // !defined(AFX_COMACCESS_H__F15FFC6E_D059_4E57_97CD_A672C05FF9B7__INCLUDED_)