Re: [AD] Problem with key_shifts on Windows.

[aj <aj@xxxxxxxxxx>]

can these problems be demonstrated/or not  in the /examples/exkeys.exe  ?



Andrei Ellman wrote:
> Hi,
>
> I have found a bug in the behaviour of the key_shifts variable in 
> Windows. Sometimes, the appropriate flag does not get set when a 
> shift/ctrl/alt key is pressed, and when the key is released, the flag 
> is set.
>
> When I run the attatched program on Windows (both W2K and W98), the 
> message to say if SHIFT/CTRL/ALT is held down is not displayed on 
> startup, not displayed when the key is pressed, but only displayed 
> once the key is released. Also, if a second SHIFT/CTRL/ALT key is 
> pressed while the first key is held down, then the flag for the first 
> key becomes set. If the first key is then released, the flag for the 
> second key is set. If however the second key is released before the 
> first key is released, then the flag for the second key is set.
>
> Another thing I notice is that as long as the flag for CTRL is set, 
> ESC does not work, and if the flag for ALT is set, neither ESC or 
> SPACE works (I've not tried any other keys).
>
> I have tried compiling my example with both MSVC6 and GCC 3.4.4 
> (Cygwin), and both exes produce the same result.
>
> However, I tried the DOS version (DJGPP under W98), and it behaved as 
> expected (the flags were unly set while the keys they represented were 
> held down).
>
> I am using Allegro 4.2.0 under both DJGPP, MSVC (both W98 and W2K) and 
> Cygwin.
>
> Also in the Windows, if ALT-GR is released, it sets both the ALT and 
> CTRL flags in key_shifts, but in the DOS version, ALT-GR only sets the 
> ALT flag when pressed. I have a UK keyboard.
>
> Incidentally, this bug manifests itself in the Allegro grabber under 
> Windows. I sometimes find that I end up selecting multiple-objects 
> when I only want to select one. If I hold down SHIFT, this problem 
> disappears.
>
> AE.