[vtkusers] iam getting an error saying "trying to delete object with non zero reference count"

[david michell]

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 Hello everybody,
 Thanks you all for the help you have done for me.
 
 Iam working on a class that uses vtk. the code goes like this
 
 //all tehe #includes are here
 class cdraw
 {
 vtkLineSource **ls;
 vtkPolyDataMapper **map;
 vtkActor **act;
 vtkRenderer *rnd;
 vtkRenderWindowInteractor *rwi;
 vtkRenderWindow *rw
 int count;
 
 public:
 cdraw(int cnt)
 {
 count=cnt;
 int i;
 ls=new vtkLineSource *[cnt];
 act=new vtkActor *[cnt];
 map=new vtkPolyDataMapper *[cnt];
 
 rnd=vtkRenderer::New();
 
 for (i=0;i<cnt;i++)
 {
  ls[i]=vtkLineSource::New();
  act[i]=vtkActor::New();
  map[i]=vtkPolyDataMapper::New();
 
  ls[i]->SetPoint1((float)i,0.0,0.0);
  ls[i]->SetPoint2((float)i,10.0,0.0);
  map[i]->SetInput(ls[i]->GetOutput()); 
  act[i]->SetMapper(map[i]);
  rnd->AddActor(act[i]);
 
 }
 
 
 rw=vtkRenderWindow::New();
 rw->AddRenderer(rnd);
 
 rwi=vtkRenderWindowInteractor::New();
 rwi->SetRenderWindow(rw);
 
 }
 
 void render()
 {
 rwi->Initialize();
 rnd->Render();
 rwi->Start();
 }
 
 ~cdraw()
 {
   for (i=0;i<cnt;i++)
  {
   ls[i]->Delete();
   act[i]->Delete();
   map[i]->Delete();
  }
  delete[] ls;
  delete[] act;
  delete[] map;
 
  rnd->Delete();
  rwi->Delete();
  rw->Delete();
 
 }
 
 };
 
 
 
 void main()
 {
   cdraw *c;
   c=new cdraw(5);
   c->render();
   
   delete c;
}


when i exit from the code pressing "q" i get a window which displays the message
"trying to delete object with non zero refernce count"

please help
thanking you for the help
david michell