AcDbGripData::setAppData(void * appData)
AcDbGripData::set appData(void * appData)appData可以是什么类型？可以是类/结构吗？谁负责释放内存？谢谢
**** Hidden Message ***** 不Acad不会删除appdata指针
它可以是您想要的任何东西，只要它不为空
Acad不会释放资源，但您可以释放项目...如果需要...在您的自定义对象的析构函数
中 所以这很酷。这有点像在抓地力中存储自己的自定义类。
像
这样简单的东西//
class MyAppData
{
private:
int m_val;
public:
MyAppData (int val): m_val(val){}
virtual ~MyAppData(){ }
void printval(void){acutPrintf(_T("\nGrip# %ld"),m_val);}
int Val() const { return m_val; }
};
然后
Acad::ErrorStatus ExtCircle::getGripPoints (
AcDbGripDataPtrArray &grips, const double curViewUnitSize, const int gripSize,
const AcGeVector3d &curViewDir, const int bitflags) const
{
assertReadEnabled () ;
AcDbGripData *pGrpCenter = new AcDbGripData();
pGrpCenter->setGripPoint(this->center());
pGrpCenter->setAppData((void*)new MyAppData(100));
grips.append(pGrpCenter);
double ang = 0.0;
for(int idx = 1 ; idx center();
p.x += this->radius() *cos(ang);
p.y += this->radius() *sin(ang);
ang += 6.28318531 / 32;
pGrp->setGripPoint(p);
// give the AcDbGripData a ptr
pGrp->setAppData((void*)_data);
pGrp->setAlternateBasePoint(newAcGePoint3d(this->center()));
grips.append(pGrp);
// keep a copy of ptr to free later
ptrs->push_back(_data);
}
return Acad::eOk;
}
然后
Acad::ErrorStatus ExtCircle::moveGripPointsAt (
const AcDbVoidPtrArray &gripAppData, const AcGeVector3d &offset,
const int bitflags) {
assertWriteEnabled();
for(int i = 0; i Val())
{
case 100:
transformBy(AcGeMatrix3d::translation(offset));
break;
default:
this->setRadius(offset.length());
}
// run a method from the class
p->printval();
}
return Acad::eOk;
}
页:
[1]