OpenEuphoria

Re: Win32 (GetAsyncKeyState)

• Posted by Molasses <molasses at ALPHALINK.COM.AU> May 20, 1999
• 557 views

Sorry that's not it.
GetAsyncKeyState takes a key value and returns true or false.

is_pressed = GetAsyncKeyState(VK_ESCAPE)

The problem being, if I'm only checking for the arrow keys and
escape and the user hits say enter then the arrow keys and escape
will stop responding.

I suppose after checking for the keys I need I could do this to clear
any other keys:

for i = 0 to 255 do
null = GetAsyncKeyState(i)
end for

But there's got to be a better way than that.

-molasses

----- Original Message -----
From: Adam Weeden <theskaman at MINDSPRING.COM>
To: <EUPHORIA at LISTSERV.MUOHIO.EDU>
Sent: Wednesday, 19 May 1999 3:13 pm
Subject: Re: Win32 (GetAsyncKeyState)


> It might be this.  In C (and its successor) whenever you are testing a
> variable against many values you use a switch statement like this:
>
> // Sorry abou the C code, necessary to show my point.
> // Assume we have already set value of key to what ASyncKeyState
> // returns.
>
> switch(key)
> {
>     case VALUE1:
>         {
>             // Do whatever you need to do for VALUE1
>         } break;
>     case VALUE2:
>         {
>             // Do whatever you need to do for VALUE2
>         } break;
>     default:
>         {
>             // If key doesnt match any of the above values do this
>         } break;
> }
>
> In Euphoria this could be wriiten as
> If key = VALUE1 then  -- Keep in mind VALUE1 in my example is a
>                                        -- constant so this is legal.
>
>         -- Do whatever you need to do for VALUE1
> elsif key = VALUE2 then
>         -- Do whatever you need to do for VALUE2
> else
>         -- If key doesnt match any of the above values do this
> end if
>
> My point is that maybe you need some sort of function that would parse a
> return value of GetAsyncKeyState that you do not need.
> Just a thought.