Re: lynx-dev Spawning an external curses-based program

[Thomas Dickey]

On Mon, Sep 16, 2002 at 04:45:56PM -0700, Umar Qureshey wrote:
> I am running lynx on an embedded system with a small lcd.  I ran some

Perhaps there is a permissions problem (or other conflict) in reopening
the output device.   Have you tried other combinations of spawning a
subprocess?  The test/ncurses.c program in ncurses has a simple test
for spawning a shell; test/filter.c is even simpler, issuing shell
commands.

> ncurses test program alone and they seem to be working fine.  However,
> launching an ncurses-based program from lynx caused the program to run but
> no output to show on the screen.  The screen does not get cleared by
> initscr, mvprintw statements do not show on screen after calling a
> refresh(), etc.  I have lynx 2.8.4.1b and my system has 4MB RAM.  Linux is
> 2.4.18 and ncurses version 5.2.  The fact that lynx is working means that
> ncurses is ok.  There seems to be some sort of terminal problem.  As for the
> actual programming, I initialize with a call to initscr(), then I do a
> mvprintw() to stdscr, and then a refresh().  Should be simple enough to work
> but doesn't.
> 
> Regards,
> UQ
> 
> -----Original Message-----
> From: Thomas Dickey [mailto:address@hidden
> Sent: Monday, September 16, 2002 4:36 PM
> To: address@hidden
> Subject: Re: lynx-dev Spawning an external curses-based program
> 
> 
> > 
> > Hi,
> >   I was wondering if anyone has experienced problem launching an
> > ncurses-based external app from lynx.  My application is launched by lynx
> > but I do not see any ncurses output on the screen.  In fact, I don't even
> > see any output from a printf.  The only way my program can output to the
> > screen is to write to stderr.  I know lynx is ncurses-based so I wanted to
> > know if anything special needs to be done to make ncurses-based external
> > programs work.  I just want rudimentary ncurses functionality, nothing
> > fancy.  Any help appreciated.
> 
> I do this all the time; it is rare to encounter problems.  (more information
> may allow me to see it break, though)
> 
> -- 
> Thomas E. Dickey <address@hidden> <address@hidden>
> http://dickey.his.com
> ftp://dickey.his.com
> 
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-- 
Thomas E. Dickey <address@hidden>
http://invisible-island.net
ftp://invisible-island.net

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