Indeed, almost all of the mv* functions are macros;

The 'api/ncurses' script has redefined some of these for use in J, but hasn't 
done this consistently.

In fact it seems to be a little out of date, I also had to update it to read 
ncurses.so.6 rather than .5

My ncurses header still went to the trouble of declaring all the macros as 
library functions, which certainly explains the strange results !

________________________________
From: Programming <programming-boun...@forums.jsoftware.com> on behalf of bill 
lam <bbill....@gmail.com>
Sent: Friday, May 18, 2018 1:19:47 AM
To: Programming forum
Subject: Re: [Jprogramming] ncurses mvwaddch@newwin unexpected behaviour

some ncurses functions are implemented as macro. C compliers can expand
them into real function call during compilation but J can't. I'll look if
this is the reason why window functions failed.

On Fri, May 18, 2018, 6:48 AM james faure <james.fa...@epitech.eu> wrote:

> Hello,
> Just wrote a classic snake game in ncurses, however I came across
> something inexplicable - The code below hangs for a sec, then exits.
> The problem is presumably with the mvwaddch function. mvwaddstr also fails.
> I was able to circumvent this by simply using the default screen returned
> by initscr, but that isn't ideal!
>
> require 'api/ncurses'
> cocurrent 'ncurses'
>
> init =. monad define
>   stdscr_ncurses_ =: initscr''
>   w =. newwin 20;60;0;0
>
>   NB. Works fine:
>   NB. getch'' [ mvaddch 10 ; 10 ; '*'
>
>   NB. hangs for a second then exits, why ?
>   mvwaddch w ; 10 ; 10 ; '*'
>   wgetch < w
> )
>
> init''
>
> Thanks for any help,
> J4
>
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