OpenEuphoria

1. RE: Window Notification Messages

• Posted by Brian Broker <bkb at cnw.com> Aug 08, 2001
• 524 views

Bernie,

Run this program and explain to me the difference...  I don't understand 
what the problem is.

include machine.e

atom a1, a2

a1 = allocate(4)
a2 = allocate(4)

poke4(a1,-520)
poke4(a2,#FFFFFDF8)

? peek4s(a1)
? peek4u(a1)
? peek4s(a2)
? peek4u(a2)

while get_key() = -1 do
  -- press any key to exit program (in case you saved as exw)
end while

-- Brian


Bernie Ryan wrote:
> 
> I have mentioned this before and I am still not satified with
> using negative decimal numbers in in place of the constants
> in the WM_NOTIFY codes ( NMHDR.code )
> 
> A Notification code is an UNSIGNED value.
> 
> In the windows COMMCTRL.H header
>   TTN_FIRST is defined as (0U-520U) -- for tooltips
> 
> In the win32lib 
>   TTN_FIRST is defined as -520
> 
> I think it should be #FFFFFDF8
> 
> Also I think that all of the notification codes in COMMCTRL.H header
> that are in this (0U-520U) form should NOT be defined with a minus
> value but in their long HEX form.
> 
> The reason for this is that if you are peeking at a NOTIFICATION
> message and you use peek4u ( the logical assumption when checking
> notification messages ) you will never see the CORRECT message
> to respond to; you have to use peek4s instead.
> 
> I think this can cause errors and confuse someone trying to write
> new code for the library
> 
> I searched through the window examples and win32lib but no one
> seems to be using these notification codes.
>  
> PS: Coming soon WIN32ERU.EX
> 
> Bernie
> Bernie
> 
> 
>