How to render solid borders in NCURSES windows Post: 302330260

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Top Forums Programming How to render solid borders in NCURSES windows Post 302330260 by tetsujin on Tuesday 30th of June 2009 04:21:08 PM

06-30-2009

Registered User

Quote:

Originally Posted by ku@ntum

Anyone please.

I really need to know how can I make my ncurses to draw solid lines.

Kashif

What is the code you're using to try to draw the solid lines? Are you using the ACS constants defined by NCurses, or are you just writing out extended-ASCII character codes?

You might want to check out some existing source code that does this - for instance, the "menuconfig" code in the Linux kernel (/usr/src/linux/scripts/kconfig/lxdialog/) - grep for ACS and you can find where it is done.

Using the ACS constants from the ncurses header is the portable solution, it will work correctly or fail gracefully on different types of terminals as long as they're set up correctly.

If you really find using ACS constants too complicated, there's an alternate option: there's a character attribute constant defined in ncurses.h called "A_ALTCHARSET". When this attribute is active, it will allow you to write out characters from the whole PC character set range - including those glyphs associated with control characters and those in the upper half of the character set. This solution is not portable, however - it's only for text consoles on PCs.

Now, I don't know if this information will solve your problem. I haven't tested this stuff. If you want me to help you further, try this stuff out. If it still doesn't work then you can provide more information about what your code is doing, and maybe I can help you out.

Last edited by tetsujin; 06-30-2009 at 05:43 PM..

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LEARN ABOUT REDHAT

vlock

VLOCK(1)						      General Commands Manual							  VLOCK(1)

NAME

       vlock - Virtual Console lock program

SYNOPSIS

       vlock

       vlock [ -a,--all ] [ -c,--current ] [ -h,--help ] [ -v,--version ]

DESCRIPTION

       vlock  is  a  program  to lock one or more sessions on the Linux console.  This is especially useful for Linux machines which have multiple
       users with access to the console.  One user may lock his or her session(s) while still allowing other users to use the system on other vir-
       tual consoles.  If desired, the entire console may be locked and virtual console switching disabled.

       By  default,  only  the	current  VC  (virtual  console)  is locked.  With the -a,-all option all VCs are locked.  The locked VCs cannot be
       unlocked without the invoker's password or the root password.  The root password will always be able to unlock any or all  sessions.   And,
       for  the  paranoid,  vlock makes it a trying experience for those attempting to guess the password, so unauthorized access to session(s) is
       highly unlikely.

       Please note that it is entirely possible to completely lock yourself out of the console with the -a,--all option  if  you  cannot  remember
       your  password!	Unless you are able to kill vlock by logging in remotely via a serial terminal or network, a hard reset is the only method
       of ``unlocking'' the display.

       vlock works for console sessions primarily.  However, there is support for trying to lock non-console sessions as well,	but  that  support
       has not been well tested.

OPTIONS

       -a,--all

	      Lock all console sessions and disable VC switching.

       -c,--current

	      Lock the current session (this is the default).

       -h,--help

	      Print a brief help message.

       -v,--version

	      Print the version number of vlock.

AUTHOR

       Michael K. Johnson <johnsonm@redhat.com>

Linux User's Manual						    16 May 1996 							  VLOCK(1)