<div>Your problem is that MyFunction should be a class derived from vtkCommand.</div>
<div> </div>
<div>You should do somethinfg like this:</div>
<div> </div>
<div><font color="#0000ff" size="2">
<p>class</p></font><font size="2"> vtkStartCommand: </font><font color="#0000ff" size="2">public</font><font size="2"> vtkCommand<br>{<br> </font><font color="#0000ff" size="2">public</font><font size="2">:</font>
<p><font size="2"> <font color="#0000ff">static</font> vtkStartCommand *New() { <font color="#0000ff">return</font> <font color="#0000ff">new</font> vtkStartCommand; }</font></p>
<p><font size="2"><font color="#0000ff"> virtual</font> <font color="#0000ff">void</font> Execute(vtkObject * caller, <font color="#0000ff">unsigned</font> <font color="#0000ff">long</font>, <font color="#0000ff">void</font>
* <font color="#008000">/* callData */</font>)<br> </font><font size="2">{ <font color="#008000">std::cout << "Starting execution of " << caller->GetClassName() << std::endl; </font>}</font>
</p>
<p><font size="2">};</font></p></div>
<div><span class="gmail_quote"><font size="2">
<p>vtkSmartPointer<vtkStartCommand> sObserver = vtkSmartPointer<vtkStartCommand>::New();</p>
<p>Then somewhere in your code:</p>
<p>...</p><font size="2">
<p>sphereWidget->AddObserver(vtkCommand::StartEvent,sObserver);</p>
<p>...</p>
<p>I hope this helps,</p>
<p> Andrew</p>
<p> </p>
<p> </p></font></font></span></div>
<div><span class="gmail_quote"></span> </div>
<div><span class="gmail_quote">On 8/13/07, <b class="gmail_sendername">JohnMark</b> <<a href="mailto:zhaojunxp@hotmail.com">zhaojunxp@hotmail.com</a>> wrote:</span></div>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div>Hi,<br>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 :
<br> sphereWidget->AddObserver( InteractionEvent, MyFunction );<br>but there is a error : 'unsigned long __thiscall vtkObject::AddObserver(unsigned long,class vtkCommand *,float)' : cannot convert parameter 2 from 'void' to 'class vtkCommand *' .
<br>So why is it ? and how can I use the AddObserver() ? Could you give me an example ? thank you !<br><br>
<hr>
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</a><br><br></blockquote><br><br clear="all"><br>-- <br>___________________________________________<br>Andrew J. P. Maclean<br>Centre for Autonomous Systems<br>The Rose Street Building J04<br>The University of Sydney 2006 NSW
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