Re: curses.h, beep() returns ERR, flash() casuses segment fault.
On Wed, Aug 27, 2008 at 07:10:40PM -0700, Christopher Joyner wrote:
I do not get the OK from beep, and flash crashes the program.
This is my code:
#include curses.h
int main(int argc,char** argv)
{
initscr();/* see also filter() and newterm() */
if(beep()!=OK)
// printf(No OK\n); fflush(stdout);
printw(No OK\n);
if(flash()!=OK)
// printf(No Flash\n); fflush(stdout);
printw(No Flash\n);
getch();
endwin();
return 0;
}
--
Thomas E. Dickey
http://invisible-island.net
ftp://invisible-island.net
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curses.h, beep() returns ERR, flash() casuses segment fault.
I do not get the OK from beep, and flash crashes the program.
This is my code:
#include curses.h
int main(int argc,char** argv)
{
if(beep()!=OK)
printf(No OK\n); fflush(stdout);
if(flash()!=OK)
printf(No Flash\n); fflush(stdout);
return 0;
}
In Love in Jesus Christ, Or Lord and Savior.
For God so loved the world, that he gave his only *begotten Son, that whosoever
believeth in him should not perish, but have everlasting life.
--John 3:16
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Re: curses.h, beep() returns ERR, flash() casuses segment fault.
Good morning!
On Wed, 27 Aug 2008 19:10:40 -0700 (PDT), Christopher Joyner [EMAIL
PROTECTED] wrote:
I do not get the OK from beep, and flash crashes the program.
This is my code:
#include curses.h
int main(int argc,char** argv)
{
if(beep()!=OK)
printf(No OK\n); fflush(stdout);
if(flash()!=OK)
printf(No Flash\n); fflush(stdout);
return 0;
}
First of all, fflush seems to need a definition from stdio.h.
I'm not sure if it's included by default (such as -lc is).
I tried to link with -lcurses and -lncurses and I can reproduce
the error you mentioned:
/* beepflash.c */
#include stdio.h
#include curses.h
int main(int argc, char **argv)
{
printf(beep: %d\n, beep());
fflush(stdout);
printf(flash: %d\n, flash());
fflush(stdout);
return 0;
}
% cc -Wall -lncurses -o beepflash beepflash.c
% ./beepflash
-1
Segmentation fault (core dumped)
Allthough I did a lot of programming with NCurses, I'm not sure
where this error comes from. My old programs do work with the
ncurses installation I have (compile + run), but none of them
uses flash() or beep(). I found out that no ncurses package is
installed.
So I did
# pkg_add -r ncurses
to install devel/ncurses (ncurses-5.6_2) and repeated the compile
process - same result. So I went to check the main difference
between my working programs and your code, because I noticed that
if I put a beep() and a flash() call into my program, they worked
as expected.
Solution: Prior to any call to the ncurses library, put these
into your code:
initscr();
cbreak();
noecho();
nonl();
intrflush(stdscr, FALSE);
keypad(stdscr, TRUE);
start_color();
I'm not sure which are essential to make beep() and flash() work
as expected, but you can easily find out which ones you don't need.
Explaination: The ncurses library / seesion doesn't seem to be
initialized correctly, that's why beep() didn't work and flash()
caused a segmentation fault.
--
Polytropon
From Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...
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Re: curses.h, beep() returns ERR, flash() casuses segment fault.
On Wednesday 27 August 2008 22:10:40 Christopher Joyner wrote:
I do not get the OK from beep, and flash crashes the program.
This is my code:
First, take a look on the manual page...
#include curses.h
int main(int argc,char** argv)
{
if(beep()!=OK)
printf(No OK\n); fflush(stdout);
if(flash()!=OK)
printf(No Flash\n); fflush(stdout);
return 0;
}
Well, try:
#include stdlib.h
#include stdio.h
#include curses.h
int
main(int argc,char** argv)
{
/* in curses(3X) manual page... */
initscr();
if (beep() != OK)
printf(No OK\n); fflush(stdout);
if (flash() != OK)
printf(No Flash\n); fflush(stdout);
return 0;
}
And read the curses manual page, you forgot to init
the screen.
In Love in Jesus Christ, Or Lord and Savior.
For God so loved the world, that he gave his only *begotten
Son, that whosoever believeth in him should not perish, but
have everlasting life. --John 3:16
[SNIP]
Regards,
--
.O. | Daniel Molina Wegener | C/C++ Developer
..O | dmw [at] unete [dot] cl | FOSS Coding Adict
OOO | FreeBSD Linux User| Standards Rocks!
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