Re: AfxBeginThread Question

From:

"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp>

Newsgroups:

microsoft.public.vc.mfc

Date:

Tue, 06 Jun 2006 10:49:27 -0400

Message-ID:

<eIelKiXiGHA.4416@TK2MSFTNGP02.phx.gbl>

Saul775 wrote:

void MyClass::DoYourFunction(CButton *button)
{
  while (button->GetCheck() == BST_CHECKED)
  {
    //Interface with COM/OLE
  }
}

But this loop will never end as this function call is not multithreaded.
I've been working with old Win32 function calls such as _beginthread and
making the function call static and changing the arguments to void's, but for
some reason, WaitForSingleObject isn't working correctly, so I'm looking at
AfxBeginThread.

Is it possible to still call AfxBeginThread on my function call WITHOUT
deriving the class from CWinThread? That's a lot of overhead that is
unnecessary for my simple function call. I know I would need to change the
return type and arguments as follows...

UINT MyClass::DoYourFunction(LPVOID pVoid)
{
  CButton *btn;
  btn = (CButton*)pVoid;
  ...
}

Thank you.

Notice that AfxBeginThread has two prototypes. The one that accepts an
AFX_THREADPROC argument creates a worker thread and does not require you
to derive a class from CWinThread. You simply pass the name of a
function as the AFX_THREADPROC parameter. (The function must be static.)

MFC threads should not access a window created in the main thread: it
can create a deadlock. Your worker thread should check a bool or an
event instead of directly accessing the button.

--
Scott McPhillips [VC++ MVP]