myfiled.cpp

在UBTUNTU下

#include "stdafx.h"
#include "MyFiled.h"

CMyFiled::CMyFiled()
{
	m_fdFile=-1;
}

CMyFiled::~CMyFiled()
{
	Close();
}

bool CMyFiled::Create(const char *pszFileName,int iAttrMode)
{
	Close();
	m_fdFile=open(pszFileName,O_CREAT|O_WRONLY|O_TRUNC,iAttrMode);
	return m_fdFile>=0;
}

bool CMyFiled::Open(const char *pszFileName,
				    int iOpenFlags)
{
	Close();
	m_fdFile=open(pszFileName,iOpenFlags);
	return m_fdFile >= 0;
}

int CMyFiled::Read(void *pvData,int iSize)
{
	return read(m_fdFile,pvData,iSize);
}

int CMyFiled::Write(const void *pvData,int iSize)
{
	return write(m_fdFile,pvData,iSize);
}

bool CMyFiled::Seek(int iSize,int iMode)
{
	return lseek(m_fdFile,iSize,iMode) >-1 ;
}

bool CMyFiled::IsOpened()
{
	return m_fdFile >= 0;
}

void CMyFiled::Close()
{
	if(m_fdFile >=0)
	{
		close(m_fdFile);
		m_fdFile=-1;
	}
}

CMyFiled &CMyFiled::operator<<(int i)
{
	Write(&i,sizeof(i));
	return *this;
}

CMyFiled &CMyFiled::operator<<(const char *pszBuf)
{
	//注意是strlen+1，把结束标记也写进去，
	//为读操作>>做准备
	Write(pszBuf,strlen(pszBuf)+1);
	return *this;
}

CMyFiled &CMyFiled::operator>>(int &i)
{
	Read(&i,sizeof(i));
	return *this;
}

CMyFiled &CMyFiled::operator>>(char *pszBuf)
{
	while(Read(pszBuf,1) == 1)
	{
		if(*pszBuf == '\0')
			break;
		pszBuf++;
	}
	*pszBuf=0;
	return *this;
}