[vtkusers] A mistake

[Andrew Maclean]

Your problem is that MyFunction should be a class derived from vtkCommand.

You should do somethinfg like this:


class vtkStartCommand: public vtkCommand
{
  public:

  static vtkStartCommand *New() { return new vtkStartCommand; }

  virtual void Execute(vtkObject * caller, unsigned long, void * /* callData
*/)
 { std::cout << "Starting execution of " << caller->GetClassName() <<
std::endl; }

};

vtkSmartPointer<vtkStartCommand> sObserver =
vtkSmartPointer<vtkStartCommand>::New();

Then somewhere in your code:

...

sphereWidget->AddObserver(vtkCommand::StartEvent,sObserver);

...

I hope this helps,

  Andrew





On 8/13/07, JohnMark <zhaojunxp at hotmail.com> wrote:

> Hi,
> I am writing a program by vtkSphereWidget ( using C++ ) ,and I want to
> connect my render window with the mouse event , so I use the AddObserver()
> function , at the same time , I write a new function that could be invoked
> , its name is MyFunction() . As the usage of AddObserver() , my code is :
>         sphereWidget->AddObserver( InteractionEvent, MyFunction );
> but there is a error : 'unsigned long __thiscall
> vtkObject::AddObserver(unsigned long,class vtkCommand *,float)' : cannot
> convert parameter 2 from 'void' to 'class vtkCommand *' .
> So why is it ? and how can I use the AddObserver() ? Could you give me an
> example ? thank you !
>
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-- 
___________________________________________
Andrew J. P. Maclean
Centre for Autonomous Systems
The Rose Street Building J04
The University of Sydney  2006  NSW
AUSTRALIA
Ph: +61 2 9351 3283
Fax: +61 2 9351 7474
URL: http://www.acfr.usyd.edu.au/
___________________________________________
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