🚀 go-pugleaf

"Matt Heling" <heli@_REMOVE_THIS_heling.de> wrote in message
news:3f82de8b@newsgroups.borland.com...

> I'm trying to write a component, which in one thread fetches data
> from some hardware (measurement data), whenever data should
> be ready to be fetched, stores the data immediately into memory
> buffer (a kind of a Fifo) and "tells" the other thread, it would now
> be allowed to read the data, when it would be ready to do so.

That's easy to do.  Simply store the data into a TThreadList so that the
data collecting is thread-safe, and then post a message to the main
component whenever data is available.  TThreadList makes sure that only 1
thread can access the data at any given time.  Or, if you're using BCB6
only, then there is a new TQueue class that is already a FIFO container,
just protect access to it using your own CriticalSection.  If the component
derives from TWinControl, then you can post the message to the component's
Handle and intercept the message in the WndProc() method.  Otherwise, call
AllocateHWnd() in the contructor to allocate a hidden window that you can
post to, and be sure to call DeallocateHWnd() in the destructor when the
window is no longer needed.


Gambit