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====== XSection ======

**//Inherited from//**  [[class::domain::nitem|NItem]],

**//Inherited by//**  NULL

**//Friend class//**  NULL

**//Description//**

XSection是定义杆梁截面的基类，它提供了杆梁截面对象的通用接口，它的类型标识前缀为CSEC。截面对象一般在用户设置单元属性时指定。

XT已预置了T型、C型、H型、管状、圆型、矩形、L型以及方框型的截面形状，除此以外用户可以通过继承XSection扩展新的截面类型，重新实现基类函数接口即可。

**//Public interface//**
  * [[xsection#xsection1|XSection]](ulong id,int tid)
  * virtual const SectionAttribute * [[xsection#getattribute|getAttribute]]() const = 0
  * virtual void [[xsection#setattribute|setAttribute]](const SectionAttribute * atb) = 0
  * virtual void [[xsection#write|write]](H5IO * io, H5Obj * grp)
  * virtual bool [[xsection#read|read]](H5IO * io, H5Obj * grp)
  * virtual void [[xsection#write|write]](XBinaryIO * io)
  * virtual ErrorCode [[xsection#read|read]](XBinaryIO * io)

----

{{anchor:xsection1}}
**XSection(ulong id,int tid)**
  *function: 构造函数
  *parameters: 
    - [i]ulong id: 对象ID
    - [i]int tid: 截面类型
  *return value: 无

{{anchor:getattribute}}
**virtual const SectionAttribute * getAttribute() const = 0**
  *function: 虚函数接口，访问截面对象的属性
  *parameters: NULL
  *return value: 截面对象的属性

{{anchor:setattribute}}
**virtual void setAttribute(const SectionAttribute * atb) = 0**
  *function: 虚函数接口，设置截面对象的属性
  *parameters: 
    - [i]const SectionAttribute * atb: 截面对象的属性
  *return value: 无

{{anchor:write}}
**virtual void write(H5IO * io, H5Obj * grp)**
  *function: 将对象数据写入到HDF5文件中
  *parameters: 
    - [i]H5IO * io: HDF5文件句柄
    - [i] H5Obj * grp: 对应的HDF5节点
  *return value: 无

{{anchor:read}}
**virtual bool read(H5IO * io, H5Obj * grp)**
  *function: 从HDF5文件中读取对象数据
  *parameters: 
    - [i]H5IO * io: HDF5文件句柄
    - [i] H5Obj * grp: 对应的HDF5节点
  *return value: 如成功读取返回true，否则返回false

{{anchor:write}}
**virtual void write(XBinaryIO * io)**
  *function: 将对象数据写入到二进制文件中
  *parameters: 
    - [i]XBinaryIO * io: 二进制文件句柄
  *return value: 无

{{anchor:read}}
**virtual ErrorCode read(XBinaryIO * io)**
  *function: 从二进制文件中读取对象数据
  *parameters: 
    - [i]XBinaryIO * io: 二进制文件句柄
  *return value: 如成功读取返回Error_None, 否则返回相应错误码
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