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From: =?UTF-8?B?QmrDtnJuIEx1bmRpbg==?= <b.f.lundin@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Get_Immediate has  raised  CONSTRAINT_ERROR : s-wchcnv.adb:207
 explicit raise
Date: Thu, 19 Feb 2015 22:37:04 +0100
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Date: 2015-02-19T22:37:04+01:00
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On 2015-02-18 18:29, darek wrote:
> Dear All,
>   reading from a keyboard  keys such as arrow keys, PgUp, PgDn, etc. seems to be a small challenge in Ada.  For this purpose one of the  Get_Immediate procedures from the Ada.Text_IO shall be used. For the keyboard we can use either 
>   - procedure Get_Immediate  (Item : out Character) 
>                or
>   - procedure Get_Immediate  (Item      : out Character; Available : out Boolean)
> 

if you use SDL, I think it will do the trick. I have some code that does

      SDL.Events.PollEventVP (PollEvent_Result, Event);
      exit when PollEvent_Result = 0;
      case Event.The_Type is
         when SDL.Events.KEYDOWN =>
           declare
             -- player 0 -> w,a,s,z
             -- player 1 -> up,left,rigt,down
             Name_Of_Key : String :=
C.Strings.Value(SDL.Keyboard.GetKeyName(Event.key.keysym.sym));
           begin
             Log("Game.Handle_Events"," Key down: '" & Name_Of_Key & "'");
             if    Name_Of_Key = "up" then
               Game.Player(Player_Idx).Game_Obj_Ptr.Heading := Up;
             elsif Name_Of_Key = "right" then
               Game.Player(Player_Idx).Game_Obj_Ptr.Heading := Right;
             elsif Name_Of_Key = "down" then
               Game.Player(Player_Idx).Game_Obj_Ptr.Heading := Down;
             elsif Name_Of_Key = "left" then
....




--
Björn