OpenEuphoria

Re: Key Trapping in win32lib

• Posted by Grape_ Vine_ <g__vine at HOTMAIL.COM> Feb 27, 2000
• 461 views

I assume the onKeyPress is a key is held down??
(that is part of what i need)
Doing this in dos was faster, Once you figured out how....

J Reeves
Grape Vine
ICQ# 13728824


>From: David Cuny <dcuny at LANSET.COM>
>Reply-To: Euphoria Programming for MS-DOS <EUPHORIA at LISTSERV.MUOHIO.EDU>
>To: EUPHORIA at LISTSERV.MUOHIO.EDU
>Subject: Re: Key Trapping in win32lib
>Date: Sun, 27 Feb 2000 10:51:37 -0800
>
>J Reeves wrote:
>
>
> > How do i setup key trapping in win32lib?
>
>Win32Lib traps key events through two seperate events. You can get 'raw'
>key
>events through onKeyUp and onKeyDown, and ANSI key events through
>onKeyPress.
>
>It's a bit weird, but it's based on how Windows is designed. The main event
>loop for most Windows applications looks something like this:
>
>    -- read event queue until WM_QUIT message received
>    while GetEvent() != 0 do
>       -- trigger the application's callback
>       DispatchMessage()
>    end while
>
>Using this, your application ends up with only 'raw' (non-ANSI) keystrokes.
>Adding a call to TranslateMessage converts the keys to ANSI (it applies the
>right shift key flags to it, etc.):
>
>    -- read event queue until WM_QUIT message received
>    while GetEvent() != 0 do
>       -- convert the onKeyPress message
>       TranslateMessage()
>       -- trigger the application's callback
>       DispatchMessage()
>    end while
>
>But there is no 'ANSI' coding for the cursor keys, etc. So you need to use
>onKeyDown to trap non-printable characters, and onKeyPress to capture
>printable chars. At some point I may unify the code by adding an 'Ansi'
>flag
>to onKeyDown, but for now it's a bit clunky.
>
>Hope this helps!
>
>-- David Cuny




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