>Hi Mike,
>
>>>How do you define a handler for the undefined WM_ messages in straight VFP? Inquring minds and all that?
>>
>>Like you would with any other language, I suppose
>
>In any other language you would install either a system hook or create a new Window Class. Both don't work in VFP as you need an address to a procedure in machine code. There's indeed one solution that could work in VFP, but it's not only slow, but also not reliable as it bases on polling the message queue using PeekMessage and eventually WaitMessage(). Since I've not tested this practically, I can't think of what kind of effect it might have on VFP itself since suspending the thread to wait for messages might interfere with VFP.

The approach of constantly polling with PeekMessage() is one I hadn't thought of; it'd eat VFP's performance doing it, and couldn't be used in conjunction with any operation that executed as an atomic statement in VFP. I remember you writing an FLL at one point that dealt with either this issue or the issue of using some of the enumeration functions that required a callback and required parallel execution with VFP code; do you have a pointer to that lying about?

>
>Christof