When we create a leader with attached MText, the main API is attachAnnotation , this function will only work if both the AcDbLeader and the AcDbMText are database resident. So we first create a leader and post it to database, then open the leader object and invoke attachAnnotation to attach the mtext. Below is an example that does this
void CreateLeaderAttachText(void)
{
ads_point adspt1, adspt2, entpt;
if(acedGetPoint(NULL,_T("\nSelect first point "),
adspt1) != RTNORM)
return;
if(acedGetPoint(NULL,_T("\nSelect Second point "),
adspt2) != RTNORM)
return;
AcGePoint3d point1, point2;
point1.set(adspt1[0],adspt1[1],0.0);
point2.set(adspt2[0],adspt2[1],0.0);
AcDbDatabase *pDb =
acdbHostApplicationServices()->workingDatabase();
//get model psace id
AcDbObjectId modelId;
modelId = acdbSymUtil()->blockModelSpaceId(pDb);
AcDbBlockTableRecord *pBlockTableRecord;
acdbOpenAcDbObject((AcDbObject*&)pBlockTableRecord,
modelId, AcDb::kForWrite);
AcDbObjectId mtextId;
AcDbMText *pMtext = new AcDbMText();
pMtext->setDatabaseDefaults () ;
pMtext->setContents(_T("TEXT STRING"));
pMtext->setLocation (point2);
pBlockTableRecord->appendAcDbEntity(mtextId, pMtext);
pMtext->close();
AcDbObjectId leaderId;
AcDbLeader *pLeader = new AcDbLeader();
pLeader->appendVertex(point1);
pLeader->appendVertex(point2);
pLeader->setDatabaseDefaults(pDb);
pBlockTableRecord->appendAcDbEntity(leaderId, pLeader);
pBlockTableRecord->close();
pLeader->close();
acdbOpenObject (pLeader, leaderId, AcDb::kForWrite) ;
pLeader->attachAnnotation(mtextId);
pLeader->evaluateLeader();
pLeader->close();
}
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