Re: pass parameter between main thread and working thread
keith <keith@discussions.microsoft.com> wrote:
I started a working thread by
AfxBeginThread(ThreadProc, GetSafeHwnd());
In the ThreadProc function, I sent a user message
::PostMessage((HWND)pParam, WM_THREADFINISHED, 0, 0)
when it is done and a main thread function handles the message.
note: WM_THREADFINISHED is user defined message.
The problem is how to pass parameter from main thread to the working
thread and vice versa.
Well, you managed to pass an HWND from main thread to worker. If you
need more parameters, just define a struct with a field for each
parameter, set up those fields, then pass the struct's pointer to
AfxBeginThread.
In the other direction, note the last two parameters of PostMessage. You
can pass arbitrary values there (e.g. again a pointer to the struct
containing additional information). Or, you can simply have extra fields
in the structure you passed to AfxBeginThread, and have the worker
thread fill them in. When the thread finishes, the main thread can read
the values back from the structure (make sure it lives long enough).
--
With best wishes,
Igor Tandetnik
With sufficient thrust, pigs fly just fine. However, this is not
necessarily a good idea. It is hard to be sure where they are going to
land, and it could be dangerous sitting under them as they fly
overhead. -- RFC 1925