topic Re: Problem Loop Pline vertex! in ObjectARX Forum

Problem Loop Pline vertex!

D_D_K — Sat, 18 Jan 2020 08:19:56 GMT

Hi, I am trying to loop each vertex in pline by using this code but when i try converting Acdbobject to acdbpolyline2D like .Net pPline = (PLINE2D*)obj ; however ObjectIterator did not seem to work, so I was unable to loop though objectIterator.

Where did I go wrong, please help

Here is the code I use:

extern void Loopvertex()
{
ADSN adsEnt; ADSPT adspt;
acedEntSel(_T("Let select pline"), adsEnt, adspt);
ID plineid;
acdbGetObjectId(plineid, adsEnt);
PLINE2D* pPline;
Object* obj;
acdbOpenObject(obj, plineId, fR); //Read pline return Acdbobject
pPline = (PLINE2D*)obj;           //Convert Acdbobject to Acdb2dPline
ObjectI* pVertIter = pPline->vertexIterator();  // get ObjectIterator but failed
'continue code
}

Thanks in advance!

Re: Problem Loop Pline vertex!

Alexander.Rivilis — Sat, 18 Jan 2020 11:38:40 GMT

@D_D_K wrote:

Hi, I am trying to loop each vertex in pline by using this code but when i try converting Acdbobject to acdbpolyline2D like .Net pPline = (PLINE2D*)obj ; however ObjectIterator did not seem to work, so I was unable to loop though objectIterator.

Where did I go wrong, please help

Here is the code I use:
extern void Loopvertex()
{
ADSN adsEnt; ADSPT adspt;
acedEntSel(_T("Let select pline"), adsEnt, adspt);
ID plineid;
acdbGetObjectId(plineid, adsEnt);
PLINE2D* pPline;
Object* obj;
acdbOpenObject(obj, plineId, fR); //Read pline return Acdbobject
pPline = (PLINE2D*)obj;           //Convert Acdbobject to Acdb2dPline
ObjectI* pVertIter = pPline->vertexIterator();  // get ObjectIterator but failed
'continue code
}
Thanks in advance!

If you will using standard names of ObjectARX classes/structures - It will be easier to help you.

AcDb2dPolyline *pline = AcDb2dPolyline::cast(obj);
if (pline) {
  AcDbObjectIterator* vi = pline->vertexIterator();
  if (vi) {
   // iterate vertexies and after delete iterator
   for (vi->start(); !vi->done(); vi->step()) {
    // getting  vertex
   }
   delete vi;
  }
}

P.S.: Are you sure your's polyline is AcDb2dPolyline and not AcDbPolyline ???

Re: Problem Loop Pline vertex!

D_D_K — Sat, 18 Jan 2020 16:04:44 GMT

Hi, sorry I couldn't distinguish pline and pline2d. I tried drawing a pline on the screen and using this code and it seems to be pline because when I changed using getpointat () method now the code works.
Thanks so much for the help.