get osnap points using ObjectARX

// - CGDgetOsnapPoint.getOsnapPoint command (do not rename)
static void CGDgetOsnapPointgetOsnapPoint(void)
    {
    // Add your code for command CGDgetOsnapPoint.getOsnapPoint here
        AcDbDatabase *pDb = acdbHostApplicationServices()->workingDatabase();
        AcDbBlockTable *pBT = NULL;
        AcDbBlockTableRecord *pBTR = NULL;
        Acad::ErrorStatus es;
        es = pDb->getSymbolTable (pBT,AcDb::kForRead );
        if(es != Acad::eOk)
            {
            acutPrintf("get block table failure,exit\n");
            return ;
            }
        es = pBT->getAt (ACDB_MODEL_SPACE,pBTR,AcDb::kForWrite );
        if(es != Acad::eOk)
            {
            acutPrintf("get block table record failure,exit\n");
            return ;
            }

        AcGePoint3d pnt1,pnt2,pnt;

        pnt1.set(8.0, 7.0, 0.0);
        pnt2.set(7.0, 7.0, 0.0);
        pnt.set(9.0,8.0,0.0);

        AcDbLine *pLine = new AcDbLine(pnt1,pnt2);
        AcDbObjectId idLine = AcDbObjectId::kNull ;
        pBTR->appendAcDbEntity (idLine,pLine);

        AcGePoint3dArray snapPoints;

        AcDbIntArray geomIds;

        es = pLine->getOsnapPoints(AcDb::kOsModePerp, 0, pnt, pnt, AcGeMatrix3d::kIdentity, snapPoints, geomIds);

        for(int i = 0;i<snapPoints.length();i++)
            {
            acutPrintf("/nthe point is %.2f,%f.2,%.2f/n",snapPoints[i].x ,snapPoints[i].y,snapPoints[i].z );
            }

        pLine->close ();
        pBTR->close();
        pBT->close();

    ///END OF COMMAND FUNCTION
    }