diskfilestream.cpp

自己写的一个IO库

// DiskFile.cpp: implementation of the CDiskFile class.
//
//////////////////////////////////////////////////////////////////////

#include "../include/DiskFileStream.h"

using namespace IMS_IO;

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CDiskFileStream::CDiskFileStream()
{

}

CDiskFileStream::~CDiskFileStream()
{
	this->m_fp = NULL;
}

bool CDiskFileStream::open(const char *pHandler,int length,char *pFlag)
{
	this->m_fp = fopen(pHandler,pFlag);
	if(!this->m_fp)
		return false;
	return true;
}

int CDiskFileStream::seek(long offset,int origin)
{
	if(!this->m_fp)
		return -1;
	int nVlaue = fseek(this->m_fp,offset,origin);
	if(nVlaue != 0)
		return -2;
	return nVlaue;
}

int CDiskFileStream::read(void *pBuffer,int size,int count)
{
	if(!this->m_fp)
		return -1;
	
	return fread(pBuffer,size,count,this->m_fp);
}

bool CDiskFileStream::close()
{
	if(!this->m_fp)
		return true;
	fclose(this->m_fp);
	return true;
}

long CDiskFileStream::length()
{
	if(!this->m_fp)
		return -1;
	fseek(this->m_fp,0,SEEK_END);
	long len = ftell(this->m_fp);
	return len;
}

long CDiskFileStream::getPos()
{
	fpos_t filepos; 
	fgetpos(this->m_fp, &filepos); 	
	int nFilePos = 0;
	
#ifdef WIN32
	nFilePos = (long)filepos;
#else
	nFilePos = (long)(filepos.__pos);
#endif
	return nFilePos;
}