archive.h

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/////////////////////////////////////////////////////////////////////////////
//  Name: archive.h
//  Copyright: wellgain
//  Author: bet
//  Date: 2003-10-10
//  Description:  the interface for class CArchive 
/////////////////////////////////////////////////////////////////////////////

#ifndef _WG_ARCHIVE_H_
#define _WG_ARCHIVE_H_

#include <stdio.h>

/////////////////////////////////////////////////////////////////////////////
#define NO_ERROR	0
#define ERR_EOF		-1
typedef unsigned int UINT;


//归档类
class CArchive
{
public:
	enum Mode { store = 0, load = 1 };	
	enum seek_dir { beg=SEEK_SET, cur=SEEK_CUR, end=SEEK_END };

	CArchive(FILE* pFile, CArchive::Mode nMode);
	~CArchive();
// Attributes 
	inline bool IsLoading() const { return (m_nMode==load); }
	inline bool IsStoring() const { return (m_nMode!=load); }
	inline FILE* GetFile()  const { return m_pFile; } 	
	
// Operations
	UINT Read(void* lpBuf, UINT nLen);
	UINT Write(const void* lpBuf, UINT nLen);
	void WriteCount(UINT nCount);
	UINT ReadCount();	
	void WriteString(char* lpsz);
	char* ReadString(char* lpsz, UINT nMax);
	long Tell()	const;
	void Flush();	
	int Seek(long offset, CArchive::seek_dir dir);  
	void Close();

	// error operations
	inline void Clear() 			{ m_nErrorNo = NO_ERROR; }
	inline int GetErrorNo() const	{ return m_nErrorNo; }
	
	// ! operation, means are there errors
	inline bool operator! () const 	{ return (m_nErrorNo!=NO_ERROR); }
	inline operator void *() const	
		{ if(m_nErrorNo==NO_ERROR)	return (void*)this;	return 0; }
	
	// insertion operations	
	CArchive& operator<<(char ch);
	CArchive& operator<<(bool b);
	CArchive& operator<<(int i);	
	CArchive& operator<<(long l);
	CArchive& operator<<(float f);
	CArchive& operator<<(double d);

	// extraction operations
	CArchive& operator>>(char& ch);
	CArchive& operator>>(bool& b);
	CArchive& operator>>(int& i);
	CArchive& operator>>(long& l);
	CArchive& operator>>(float& f);
	CArchive& operator>>(double& d);

protected:
	CArchive();
	// archive objects cannot be copied or assigned
	CArchive(const CArchive& arSrc);
	void operator=(const CArchive& arSrc);

private:	
	UINT m_nMode;
	FILE* m_pFile;
	int m_nErrorNo;
};



#endif //_WG_ARCHIVE_H_