ObjectArxC++使用Xdata对自定义实体进行过滤筛选和批量操作
扩充数据又分为Xdata（eXtension data）和 Xrecord（eXtension record）两种。Xdata有一个重要功能是可以对自定义实体进行过滤筛选，然后对筛选出来的数据进行批量操作。使用Xdata对自定义实体进行批量操作过程如下。
主要思路是：
[*]创建自定义实体时增加扩展数据Xdata，同一种自定义实体可以添加不同的Xdata。
[*]批量处理时，根据Xdata扩展数据对数据进行过滤筛选。
代码示例如下：
[*]创建自定义实体时增加扩展数据Xdata
//zhaoanan 增加扩展数据Xdata
//将里程实体加入到块表记录中
//CZnUtility::addRailSlope(cthRailSlope, "ZDK1+222.45", "ZDK2+123.11", "20", 20.00, cthRailSlope->CString2double("30"), "123", cthRailSlope->position().x + 20, cthRailSlope->position().x + 50, 1);
AcDbObjectId dimensionId = CDwgDatabaseUtil::PostToModelSpace(cthRailSlope, m_pDb);
AcDbEntity* pEnt=NULL;
if (mysys->OpenAcDbEntity(dimensionId,pEnt,AcDb::kForRead))
{
CthRailSlope *pSlopeEnt = CthRailSlope::cast(pEnt);
pSlopeEnt->upgradeOpen();
//SlopeType=SlopeHead代表坡度头，SlopeType=SlopeBody代表坡度段
CString mSlopeType = _T("SlopeHead");
pSlopeEnt->setValue(_T("SlopeType"), mSlopeType);
mysys->SetXdata(pSlopeEnt, mSlopeType, _T("CthRailSlope"));
pSlopeEnt->downgradeOpen();
//关闭对象
if (pEnt != nullptr) {
pEnt->close();
}
}
//将里程实体加入到块表记录中
//cthRailSlope->AddRailSlope("ZDK1+222.45", "ZDK2+123.11", "20", 20.00, "30", cthRailSlope->position().x + 20, cthRailSlope->position().x + 50, 1);
AcDbObjectId pEntId = CDwgDatabaseUtil::PostToModelSpace(cthRailCurves, m_pDb);
//创建图层
CUserSystem mysys;
//打开编辑图元
AcDbEntity* pEnt=NULL;
if (mysys.OpenAcDbEntity(pEntId, pEnt, AcDb::kForRead))
{
CthEntity *pthEnt=CthEntity::cast(pEnt);
if (pthEnt != NULL)
{
pthEnt->upgradeOpen();
//增加扩展数据到数据字典，坡度方向、坡度、长度、里程、竖曲线半径
//设置类型和数值
pthEnt->setValue(_T("限速"), m_vlmtv);
pthEnt->setValue(_T("名称"), m_curves_name);
pthEnt->setValue(_T("长度"), m_length);
pthEnt->setValue(_T("半径"), m_radius);
pthEnt->setValue(_T("左里程"), m_left_kmpost);
pthEnt->setValue(_T("右里程"), m_right_kmpost);
//格式化曲线长度，格式化为保留两位小数
CString m_m_direction_str;
m_m_direction_str.Format(_T("%d"),m_direction);
pthEnt->setValue(_T("方向"), m_m_direction_str);
//CurvesType=CurvesHead代表曲线头，CurvesType=CurvesBody代表曲线段 add by zhaoanan 20210809 begin
CString mSlopeType = _T("CurvesBody");
pthEnt->setValue(_T("CurvesType"), mSlopeType);
mysys.SetXdata(pthEnt, mSlopeType, _T("CthRailCurves"));
//CurvesType=CurvesHead代表曲线头，CurvesType=CurvesBody代表曲线段 add by zhaoanan 20210809 end
pthEnt->downgradeOpen();
}
}批量处理时，根据Xdata扩展数据对数据进行过滤筛选//zhaoanan 删除全图所有坡度段
// - zhfzndraw_thdeleteallslopes command (do not rename)
//删除全图所有坡度段
static void zhfzndraw_thdeleteallslopes(void)
{
AcDbDatabase * m_pDb = acdbHostApplicationServices()->workingDatabase();
//添加块定义
acutPrintf(_T("\n删除全图所有坡度段")) ;
CUserSystem *mysys = new CUserSystem();
mysys->m_pDb = m_pDb;
//声明左边插入点
//struct resbuf *pRb ;
//pRb = acutBuildList(RTDXF0,_T("CthRailSlope"),0) ;
struct resbuf eb1,eb2,eb3;
char sbuf1,sbuf2;
eb1.restype=0;//实体类型
strcpy(sbuf1, "CthRailSlope");
eb1.resval.rstring=CZnUtility::ConvertCharPtrToAcharPtr(sbuf1);//实体为坡度段
eb1.rbnext = &eb2;
eb2.restype = -3;//使用扩展数据Xdata进行过滤
eb2.rbnext = &eb3;
eb3.restype = AcDb::kDxfRegAppName;//扩展数据中的字符串DXF码
strcpy(sbuf2, "SlopeBody");
eb3.resval.rstring=CZnUtility::ConvertCharPtrToAcharPtr(sbuf2); //扩展数据中的字符串
eb3.rbnext=NULL;
long iNum = 0 ;
CLongArray iArrayHandle;
iNum = mysys->GetSSEntHandle(_T("X"), NULL, NULL, &eb1, iArrayHandle) ;
//acutRelRb(pRb) ;
for (long i =0;i<iNum;i++)
{
long handleDi = iArrayHandle.GetAt(i);
AcDbEntity * pEnt = NULL ;
CthEntity * pthEnt = NULL;
if(mysys->OpenAcDbEntity(handleDi, pEnt, AcDb::kForRead))
{
//指定坡度端点
if(pEnt->isKindOf(CthRailSlope::desc()))
{
pthEnt = CthRailSlope::cast(pEnt) ;
pthEnt->upgradeOpen();
try
{
/*- 3删除公里标对象*/
pthEnt->upgradeOpen();
pthEnt->erase();
pthEnt->downgradeOpen();
pthEnt->close();
}
catch (...)
{
ads_printf(_T("\nunknown CException in zhfzndraw_thdeleteallslopes")) ;
}
}
if(pEnt!=NULL)
{
pEnt->close();
}
}
//AcDbObjectId dimensionId = CDwgDatabaseUtil::PostToModelSpace(cthRailSlope, m_pDb);
}
acedUpdateDisplay();
acutPrintf(_T("\n全图所有坡度段已删除！")) ;
//释放mysys空间
if (mysys != nullptr)
{
delete mysys;
}
}
参考意见和网页地址：
[*]https://blog.csdn.net/weixin_42366571/article/details/104229107
[*]https://blog.csdn.net/weixin_42366571/article/details/104364849
文档来源：51CTO技术博客https://blog.51cto.com/zhaoanan/3337519
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