I am just starting off with VB5, and I just want to know how to cancel a
file write process in response to a keypress during a long file write. I
have tried to use  timer and the doevents to monitor keyboard activity, but
I seem to get nowhere.

I must be doing something very simple wrong.

Can anyone help?

Cyprien de Cosson.

I think the best thing to do is establish a loop and check for a flag every
so many cycles to see if the user pressed a "Cancel" button that you give
him.

Like:

For i=1 to a zillion
        'do some stuff like write to a file
        DoEvents  'need this somewhere to make sure you get the keypress and the
flag value setting
        If i mod 10 = 0 then  ' check every 10 loop cycles
                If blnFlag=True then  'see if the user has pressed a 'Cancel' button
                        Exit Sub
                End If
        End If
Next i

If you simply start a long process that you do not interrupt with code
(like streaming a long file and not yielding to the system), you won't have
much success.

Dave Burr
Lumisoft