DXF图元文件提取与显示(一)

#include "StdAfx.h"#include "DXFMeta.h"//图元名称const string DXFMeta::NAMES[MetaTypes]={"OTHER","LINE","CIRCLE","POLYLINE"};//************************************// 图元对象是所有图元的基类，针对DXF的行和偏移// 的字节数，利用虚函数读取相关图元信息来构建一// 个图元对象// Method:    DXFMeta// FullName:  DXFMeta::DXFMeta// Access:    public // Returns:   // Qualifier:// Parameter: UINT rCount所在DXF文件的行号// Parameter: UINT seekBytes所在DXF文件的字节// 偏移位置// Author:zhengzhe 2011-11-22//************************************DXFMeta::DXFMeta(UINT rCount,UINT seekBytes){m_rowEndIndex=m_rowStartIndex=rCount;m_memSeekEndPos=m_memSeekStartPos=seekBytes;type = OTHER;}DXFMeta::~DXFMeta(void){}//************************************// 获取图元名称// Method:    GetName// FullName:  DXFMeta::GetName// Access:    public // Returns:   std::string// Qualifier: const// Author:zhengzhe 2011-11-22//************************************std::string DXFMeta::GetName() const{return NAMES[GetMetaType()];}//************************************// 获取图元类型// Method:    GetMetaType// FullName:  DXFMeta::GetMetaType// Access:    public // Returns:   DXFMeta::DXFMetaType// Qualifier: const// Author:zhengzhe 2011-11-22//************************************DXFMeta::DXFMetaType DXFMeta::GetMetaType() const{return type;}//************************************// 读取一行信息的更新操作，增加一行，并更新读写指针// 偏移的字节数// Method:    IncrementCount// FullName:  DXFMeta::IncrementCount// Access:    public // Returns:   void// Qualifier:// Parameter: DXFMeta & meta// Parameter: char * tmp// Author:zhengzhe 2011-11-22//************************************void DXFMeta::IncrementCount( DXFMeta &meta, char * tmp ){++meta.m_rowEndIndex;meta.m_memSeekEndPos+=(strlen(tmp)+1)*sizeof(char);}//************************************// 获取线信息在文档中的结束位置的偏移字节数// Method:    GetSeekEndPos// FullName:  DXFLine::GetSeekEndPos// Access:    virtual public // Returns:   UINT// Qualifier: const// Author: zhengzhe  2011-11-21//************************************UINT DXFMeta::GetSeekEndPos() const{return m_memSeekEndPos;}//************************************// 获取信息结束的行号// Method:    GetRowEndIndex// FullName:  DXFMeta::GetRowEndIndex// Access:    public // Returns:   UINT// Qualifier: const// Author:zhengzhe 2011-11-21//************************************UINT DXFMeta::GetRowEndIndex() const{return m_rowEndIndex;}//************************************// 获取信息开始的行号// Method:    GetRowStartIndex// FullName:  DXFMeta::GetRowStartIndex// Access:    public // Returns:   UINT// Qualifier: const// Author:zhengzhe 2011-11-21//************************************UINT DXFMeta::GetRowStartIndex() const{return m_rowStartIndex;}//************************************// 获取未修改前信息数据的字节大小// Method:    GetOrgByteSize// FullName:  DXFMeta::GetOrgByteSize// Access:    public // Returns:   UINT// Qualifier: const// Author:zhengzhe 2011-11-21//************************************UINT DXFMeta::GetOrgByteSize() const{return m_orgByteSize;}//************************************// 获取修改后信息数据的字节大小// Method:    GetCurByteSize// FullName:  DXFMeta::GetCurByteSize// Access:    public // Returns:   UINT  字节数// Qualifier: const// Author:zhengzhe 2011-11-21//************************************UINT DXFMeta::GetCurByteSize() const{return m_curByteSize;}//************************************// 计算当前字节大小// Method:    CalCurByteSize// FullName:  DXFMeta::CalCurByteSize// Access:    public // Returns:   void// Qualifier:// Author:zhengzhe 2011-11-21//************************************void DXFMeta::CalCurByteSize(){m_curByteSize = m_memSeekEndPos-m_memSeekStartPos;}//************************************// 获取该线段描述开始在文档中偏移的字节位置// Method:    GetSeekStartPos :// FullName:  DXFLine::GetSeekStartPos// Access:    virtual public // Returns:   UINT// Qualifier: const// Author:zhengzhe 2011-11-21//************************************UINT DXFMeta::GetSeekStartPos() const{return m_memSeekStartPos;}//************************************// 显示图元基本信息// Method:    operator<<// FullName:  operator<<// Access:    public // Returns:   ostream&// Qualifier:// Parameter: ostream & os// Parameter: const DXFMeta & meta// Author:zhengzhe 2011-11-21//************************************ostream& operator<<( ostream& os,const DXFMeta& meta ){os<<"Meta Info:\n"<<"----------------------------------"<<"\n\tMeta Name:"<< meta.GetName()<<"\n\tOrgInfo Byte Size:"<<meta.GetOrgByteSize()<<"\tCurInfo Byte Size:"<<meta.GetCurByteSize()<<"\n\tStart At Line No:"<<meta.m_rowStartIndex<<"\tEnd At Line No:"<<meta.m_rowEndIndex<<"\n\tSeek Byte:"<<meta.GetSeekStartPos();return os;}

 

http://blog.csdn.net/password318/article/details/7009939