[求助]：关于AcDbLeader的问题[已解决]

habit

想用ARX程序创建引线标注， 觉得创建一个AcDbMText和一个AcDbLeader，但是如何把两者绑定和定位呢？哪位指点一下？

自己找到了答案，和大家共享

ads_point ads_ptBase, ads_ptRes;
AcGePoint3d ptLBegin, ptLEnd;
AcDbLeader* pLabel;
AcDbMText* pText;
AcDbBlockTable *pBlockTab;
AcDbBlockTableRecord *pBlockTabRec;

if(ads_getpoint(NULL, NULL, ads_ptBase) != RTNORM)
  return;
ptLBegin[0] = ads_ptBase[0];
ptLBegin[1] = ads_ptBase[1];

if(ads_getpoint(ads_ptBase, NULL, ads_ptRes) != RTNORM)
  return;
ptLEnd[0] = ads_ptRes[0];
ptLEnd[1] = ads_ptRes[1];

acdbCurDwg()->getBlockTable(pBlockTab, AcDb::kForWrite);
pBlockTab->getAt(ACDB_MODEL_SPACE, pBlockTabRec, AcDb::kForWrite);

pText = new AcDbMText;
pText->setTextHeight(1);
pText->setAttachment(AcDbMText::AttachmentPoint::kBottomLeft);
pText->setLocation(ptLEnd);
pText->setContents("Привет");
pBlockTabRec->appendAcDbEntity(idTmp, pText);
pText->close();

pLabel = new AcDbLeader;
pLabel->appendVertex(ptLBegin);
pLabel->appendVertex(ptLEnd);
pBlockTabRec->appendAcDbEntity(idRetVal, pLabel);
pLabel->close();

pBlockTab->close();
pBlockTabRec->close();

acdbOpenAcDbEntity(pEnt, idRetVal, AcDb::kForWrite);
AcDbLeader::cast(pEnt)->attachAnnotation(idTmp);
AcDbLeader::cast(pEnt)->evaluateLeader();
pEnt->close();