🚀 go-pugleaf

"Alistair" <Alistair@NoSpam.Sodoff> wrote:

>So what you are saying is that I have no way of including a function in my 
>class that is passed to the WINAPI CreateThread method?

No, that's not what he said.

What he was telling you is that a normal member function cannot be
passed to CreateThread, simply because it requires a free (aka 'global')
function. However, when it calls the function you supplied, it passes a
void* pointer, the same one you gave it when you called
::CreateThread().

You therefore want to use this pointer to carry around an object
pointer, as this:

  class MyThread
  {
     public:
              void         CreateThread();
              DWORD        ThreadProc2 ();
       static DWORD WINAPI ThreadProc  (void* Param);
  );

  void
  MyThread::CreateThread()
  {
     // ...     
     ::CreateThread(..., ..., ThreadProc, this, ..., ...);
  }

  DWORD 
  MyThread::ThreadProc(void* Param)
  {
     // static casting to member function
     return static_cast<MyThread*>(Param)->ThreadProc2();  
  }

  DWORD 
  MyThread::ThreadProc2()
  {
     // A normal member function you can do with as you like
  }

If you want multiple threads within a single object, it obviously gets a
little trickier, but using subobjects will sort that.

Alan Bellingham
-- 
ACCU Conference 2005 - 20-23 April, Randolph Hotel, Oxford, UK