[erlang-questions] gs:read

dae <>
Sat Aug 11 18:00:23 CEST 2007


Newbie question:

I am looking at the docs for gs
and am trying to modify ex9
(copied below from
/lib/gs-1.5.7/doc/html/gs_chapter8.html).

I want the window to stay open after sending
a name tuple to the console, so another name
tuple can be sent.  I don't want the window
to close unless I click the cancel button
(or the top-right X button).

I've tried adding loop(Pid) at the end of the two receive
clauses which call Text=gs:read(entry,text), but get strange
results. (this on XP, using werl).

Can someone show me how to do it? Thanks.
----------
from the docs:

-module(ex9).
-copyright('Copyright (c) 1991-97 Ericsson Telecom AB').
-vsn('$Revision: /main/release/2 $ ').

-export([start/0,init/1]).

start() ->
     spawn(ex9, init, [self()]),
     receive
         {entry_reply, Reply} -> Reply
     end.

init(Pid) ->
     S = gs:start(),
     Win = gs:create(window,S,[{title,"Entry Demo"},
                               {width,150},{height,100}]),
     gs:create(label,Win,[{label,{text,"What's your name?"}},
                          {width,150}]),
     gs:create(entry,entry,Win,[{x,10},{y,30},{width,130},
                                {keypress,true}]),
     gs:create(button,ok,Win,[{width,45},{y,60},{x,10},
                              {label,{text,"Ok"}}]),
     gs:create(button,cancel,Win,[{width,60},{y,60},{x,80},
                                  {label,{text,"Cancel"}}]),
     gs:config(Win,{map,true}),
     loop(Pid).

loop(Pid) ->
     receive
         {gs,entry,keypress,_,['Return'|_]} ->
             Text=gs:read(entry,text),
             Pid ! {entry_reply,{name,Text}};
         {gs,entry,keypress,_,_} -> % all other keypresses
             loop(Pid);
         {gs,ok,click,_,_} ->
             Text=gs:read(entry,text),
             Pid ! {entry_reply,{name,Text}};
         {gs,cancel,click,_,_} ->
             Pid ! {entry_reply,cancel};
         X ->
             io:format("Got X=~w~n",[X]),
             loop(Pid)
     end.




More information about the erlang-questions mailing list