ObjectArx创建指定块

ObjectArx创建自定义块

一. 目的

仿照AutoCad的Block命令，实现简版创建块功能!

二. 开发环境

Win7操作系统，AutoCad2012， VS2008, ObjectArx_SDK_2012

三. 相关函数简介

1) int acedSSGet (const ACHAR *str, const void *pt1,const void *pt2, const struct resbuf *filter,ads_name ss);

选择集，个人理解：就是让你一次可以选择多个实体，与之相似的acedEntSel()一次只能选择一个实体

2) int acedSSName (const ads_name ss, AdInt32 i, ads_name entres)

既然选择了多个实体，我怎么得到其中的每一个实体呢？次函数即可让你得到选择实体中的任一个，参数二相当于索引，参数三就是还回的实体名

3）Acad::ErrorStatus acdbGetObjectId(AcDbObjectId& objId,const ads_name objName);

通过实体名获取实体ID，与之相同的另外几个函数（指针，句柄，ads_name之间的转换）

acdbopenAcDbEntity，objectid，getAcDbObject，acdbGetObjectid，acdbGetAdsName等

四.代码实现流程

1) 首先我们得获取实体，保存这些实体的ID，实现代码：

void MyBlock::GetPickEntity(AcDbObjectIdArray &idObjectArray)
{
ads_name adsName;
AdInt32 ssLen;
acedSSGet(NULL, NULL, NULL, NULL, adsName);
acedSSLength(adsName, &ssLen);
idObjectArray.removeAll();
for (INT32 i = 0; i < ssLen; i++)
{
ads_name entityName;
acedSSName(adsName, i, entityName);
AcDbObjectId entityID;
acdbGetObjectId(entityID, entityName);
idObjectArray.append(entityID);
}
acedSSFree(adsName);

2) 从当前块表中查看是否已存在此块名记录，没有则创建新的块表记录，将选择的实体Clone一份，插入到新的

块表记录中，切记，关闭所有的数据库对象，实现代码（代码有点渣）：

Acad::ErrorStatus MyBlock::CreateBlock(const CString &strBlockName, const AcDbObjectIdArray &idObjectArray)
{
AcDbBlockTable *pBlockTable = NULL;
Acad::ErrorStatus es = acdbHostApplicationServices()->workingDatabase()->getBlockTable(pBlockTable, AcDb::kForRead);
if (Acad::eOk != es)
{
return es;
}
if (Adesk::kTrue == pBlockTable->has(strBlockName))
{
pBlockTable->close();
return es;
}
AcDbBlockTableRecord *pBlockTableRcd = new AcDbBlockTableRecord();
es = pBlockTableRcd->setName(strBlockName);
es = pBlockTableRcd->setOrigin(AcGePoint3d::kOrigin);
es = pBlockTable->upgradeOpen();
if (Acad::eOk != es)
{
pBlockTableRcd->close();
pBlockTable->close();
return es;
}
es = pBlockTable->add(pBlockTableRcd);
if (Acad::eOk != es)
{
pBlockTable->close();
pBlockTableRcd->close();
return es;
}
pBlockTable->close();
AcGeMatrix3d mat;
mat.setToIdentity();
for (INT32 i = 0; i < idObjectArray.length(); i++)
{
AcDbEntity *pEntity = NULL;
es = acdbOpenAcDbEntity(pEntity, idObjectArray.at(i), AcDb::kForRead);
if (Acad::eOk != es)
{
acDocManager->unlockDocument(curDoc());
pBlockTableRcd->close();
return es;
}

AcDbEntity *pNewEntity = AcDbEntity::cast(pEntity->clone());
es = pBlockTableRcd->appendAcDbEntity(pNewEntity);
if (Acad::eOk != es)
{
acDocManager->unlockDocument(curDoc());
pBlockTableRcd->close();
pEntity->close();
pNewEntity->close();
return es;
}
pEntity->close();
pNewEntity->close();
}
pBlockTableRcd->close();
return es;