Adding layer filters to dwg.

[kevin.putnam]

How can I create layer filters programmatically using ObjectARX?

[Alexander.Rivilis]

More then ten years ago I wrote next test code:

static void LayerFilterAdd(void)
{
  Acad::ErrorStatus es;
  AcLyLayerFilterManager *pLFMan = aclyGetLayerFilterManager(acdbCurDwg());
  if (!pLFMan) return;
  AcLyLayerFilter *pRoot = NULL, *pCurrent = NULL;
  if ((es = pLFMan->getFilters(pRoot,pCurrent)) != Acad::eOk)  {
    acutPrintf(_T("\npLFMan->getFilters(pRoot,pCurrent)=%s"),acadErrorStatusText(es));
    return;
  }
  AcLyLayerGroup *pNew = new AcLyLayerGroup();
  pNew->setName(_T("My Filters Group"));
  // Adding 5 layers
  {
      AcDbLayerTablePointer pLT(acdbCurDwg()->layerTableId(),AcDb::kForWrite);
      for (int i=0; i < 5; i++) {
        AcDbLayerTableRecord *pLTR = new AcDbLayerTableRecord();
        ACHAR layerName[512]; acutSPrintf(layerName,_T("New Layer %d"),i);
        pLTR->setName(layerName);
        AcDbObjectId eid;
        if (pLT->add(eid,pLTR) != Acad::eOk) {
          pLT->getAt(layerName,eid);
        }
        if (!eid.isNull()) {
          pLTR->close();
          pNew->addLayerId(eid);
        } else {
          delete pLTR;
        }
      }
  }
  pRoot->addNested(pNew);
  if ((es = pLFMan->setFilters(pRoot,pNew)) != Acad::eOk)  {
    acutPrintf(_T("\npLFMan->setFilters(pRoot,pNew)=%s"),acadErrorStatusText(es));
    return;
  }
}

Maybe it will be useful for you.

[Alexander.Rivilis]

Also this blog can be useful:

Creating and accessing layer filter information

[zhptj1986]

Very good!