[vtkusers] About vtkMultithreader

[童宇辰]

Hi All.
Can somebody show me an examle how to use vtkMultiThreader class;
I'm using VTK under Win32 and Microsoft Visual C++. Do I have to use
vtkMultiThreader class or can I use MFC CWinThread class?

When I use MFC CWinThread class , I have a trouble about
OPENGL..(wglMakeCurrent failed in MakeCurrent(), error)

Here is some code that I Write

vtkRenderer* Renderer = vtkRenderer::New();
CWinThread* pThread;
pThread=AfxBeginThread(ChildThread,(LPVOID)this,THREAD_PRIORITY_NORMAL);

ChildThread
{
    InitializeCriticalSection(&csObject);
    MyFunc();
    pThread=NULL;
}

MyFunc
{
    ....Do Something ...
    myDraw();
}

myDraw()
{
        ...
        Renderer->GetProps()->RemoveAllItems(); --->here have problem
        ...
}

The Problem Pipeline is ::
vtkWin32OpenGLRenderWindow::MakeCurrent();
{
// Try to avoid doing anything (for performance).
  HGLRC current = wglGetCurrentContext();
   if (this->ContextId != current)
    {
    if(this->IsPicking && current)
      {
      vtkErrorMacro("Attempting to call MakeCurrent for a different window"
                    " than the one doing the picking, this can causes
crashes"
                    " and/or bad pick results");
      }
    else
      {
      if (wglMakeCurrent(this->DeviceContext, this->ContextId) != TRUE)
        {
        LPVOID lpMsgBuf;
        ::FormatMessage(
          FORMAT_MESSAGE_ALLOCATE_BUFFER |
          FORMAT_MESSAGE_FROM_SYSTEM |
          FORMAT_MESSAGE_IGNORE_INSERTS,
          NULL,
          GetLastError(),
          MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
          (LPTSTR) &lpMsgBuf,
          0,
          NULL
          );
        vtkErrorMacro("wglMakeCurrent failed in MakeCurrent(), error: "
                      << (LPCTSTR)lpMsgBuf);
        ::LocalFree( lpMsgBuf );
        }
      }
    }
}

my GetLastError is 170 -->
The requested resource is in use.  ERROR_BUSY

Why?
How Can I Do?

Thank you very much....

Tung. Taiwan