I was just wondering if there is any way of editing anything already
printed on the screen with out using the system("cls") command.
Aug 17 '06
51  3937 
On Thu, 17 Aug 2006, Thomas Dickey wrote:
Andrew Smallshaw <an*****@sdf.lo nestar.orgwrote :
>Most terminals, particularly modern ones, will clear the screen if
you simply send them a formfeed. It's not guaranteed, but it's a
you're confused. Whether you've observed a particular terminal driver,
or a user application is probably irrelevant.
I don't think Andrew is confused. I think you are.
Tak-Shing
On Thu, 17 Aug 2006, Herbert Rosenau wrote:
On Thu, 17 Aug 2006 00:33:37 UTC, "someone" <ra************ @gmail.com>
wrote:
>I was just wondering if there is any way of editing anything already
printed on the screen with out using the system("cls") command.
No, because C does know nothing about a screen, TTY, printer or other
devises. So you may ask in a group related to POSIX or to your OS to
get a solution beside standard C.
C does know about character display semantics (ISO 9899/1990
*and* 1999, 5.2.2), specifically backspaces ('\b'), form feeds
('\f'), and carriage returns ('\r'). So yes, it is possible to
``edit'' something already printed on a display device (however,
quality of implementation differs).
Tak-Shing
On Thu, 17 Aug 2006, Ancient_Hacker wrote:
someone wrote:
>I was just wondering if there is any way of editing anything already
printed on the screen with out using the system("cls") command.
There is no "C" way to do this, as C precedes most CRT terminals,
What about ISO 9899:1990, 5.2.2, where escape sequences for
display devices (such as '\f', '\b' and '\r') are defined? The
only problem with these are quality of implementation issues.
Tak-Shing
Tak-Shing Chan <t.****@gold.ac .ukwrote:
On Thu, 17 Aug 2006, Thomas Dickey wrote:
>Andrew Smallshaw <an*****@sdf.lo nestar.orgwrote :
>>Most terminals, particularly modern ones, will clear the screen if
you simply send them a formfeed. It's not guaranteed, but it's a
you're confused. Whether you've observed a particular terminal driver,
or a user application is probably irrelevant.
I don't think Andrew is confused. I think you are.
hmm. I have a list in mind. Which "modern" one clears the screen
when you send a form-feed to it?
--
Thomas E. Dickey http://invisible-island.net ftp://invisible-island.net
Thomas Dickey <di****@saltmin e.radix.netwrot e:
Tak-Shing Chan <t.****@gold.ac .ukwrote:
>On Thu, 17 Aug 2006, Thomas Dickey wrote:
>>Andrew Smallshaw <an*****@sdf.lo nestar.orgwrote :
Most terminals, particularly modern ones, will clear the screen if
you simply send them a formfeed. It's not guaranteed, but it's a
you're confused. Whether you've observed a particular terminal driver,
or a user application is probably irrelevant.
> I don't think Andrew is confused. I think you are.
hmm. I have a list in mind. Which "modern" one clears the screen
when you send a form-feed to it?
It occurs to me that you don't know
(googling to get a sense of your background makes that apparent).
A quick check shows putty doing this. vt100/etc don't. putty, of course,
is not a vt100 emulator (or xterm, etc). xterm and anything that emulates
vt100 will simply move the cursor to the next line.
There's some useful information on vt100.net which you might read before
wasting more bandwidth.
bye
--
Thomas E. Dickey http://invisible-island.net ftp://invisible-island.net
On Thu, 17 Aug 2006, Thomas Dickey wrote:
Tak-Shing Chan <t.****@gold.ac .ukwrote:
>On Thu, 17 Aug 2006, Thomas Dickey wrote:
>>Andrew Smallshaw <an*****@sdf.lo nestar.orgwrote :
Most terminals, particularly modern ones, will clear the screen if
you simply send them a formfeed. It's not guaranteed, but it's a
you're confused. Whether you've observed a particular terminal driver,
or a user application is probably irrelevant.
> I don't think Andrew is confused. I think you are.
hmm. I have a list in mind. Which "modern" one clears the screen
when you send a form-feed to it?
Andrew wrote: ``it's not guaranteed''. Which part of ``it's
not guaranteed'' you don't understand?
Tak-Shing
On Thu, 17 Aug 2006, Thomas Dickey wrote:
Thomas Dickey <di****@saltmin e.radix.netwrot e:
>Tak-Shing Chan <t.****@gold.ac .ukwrote:
>>On Thu, 17 Aug 2006, Thomas Dickey wrote:
>>>Andrew Smallshaw <an*****@sdf.lo nestar.orgwrote :
Most terminals, particularly modern ones, will clear the screen if
you simply send them a formfeed. It's not guaranteed, but it's a
you're confused. Whether you've observed a particular terminal driver,
or a user application is probably irrelevant.
>> I don't think Andrew is confused. I think you are.
>hmm. I have a list in mind. Which "modern" one clears the screen
when you send a form-feed to it?
It occurs to me that you don't know
(googling to get a sense of your background makes that apparent).
A quick check shows putty doing this. vt100/etc don't. putty, of course,
is not a vt100 emulator (or xterm, etc). xterm and anything that emulates
vt100 will simply move the cursor to the next line.
There's some useful information on vt100.net which you might read before
wasting more bandwidth.
All irrelevant to my point. By the way, PuTTY is more
"modern" than vt100, but I suppose you are not aware of this
(judging from what you wrote above).
Tak-Shing
Tak-Shing Chan <t.****@gold.ac .ukwrote:
On Thu, 17 Aug 2006, Thomas Dickey wrote:
>Tak-Shing Chan <t.****@gold.ac .ukwrote:
>>On Thu, 17 Aug 2006, Thomas Dickey wrote:
>>>Andrew Smallshaw <an*****@sdf.lo nestar.orgwrote :
Most terminals, particularly modern ones, will clear the screen if
you simply send them a formfeed. It's not guaranteed, but it's a
you're confused. Whether you've observed a particular terminal driver,
or a user application is probably irrelevant.
>> I don't think Andrew is confused. I think you are.
hmm. I have a list in mind. Which "modern" one clears the screen
when you send a form-feed to it?
Andrew wrote: ``it's not guaranteed''. Which part of ``it's
not guaranteed'' you don't understand?
Indeed. You don't know the answer to my question, so you're attempting
to justify it by changing the question.
--
Thomas E. Dickey http://invisible-island.net ftp://invisible-island.net
On Thu, 17 Aug 2006, Thomas Dickey wrote:
Tak-Shing Chan <t.****@gold.ac .ukwrote:
>On Thu, 17 Aug 2006, Thomas Dickey wrote:
>>Tak-Shing Chan <t.****@gold.ac .ukwrote:
On Thu, 17 Aug 2006, Thomas Dickey wrote:
Andrew Smallshaw <an*****@sdf.lo nestar.orgwrote :
>
>Most terminals, particularly modern ones, will clear the screen if
>you simply send them a formfeed. It's not guaranteed, but it's a
>
you're confused. Whether you've observed a particular terminal driver,
or a user application is probably irrelevant.
I don't think Andrew is confused. I think you are.
hmm. I have a list in mind. Which "modern" one clears the screen
when you send a form-feed to it?
> Andrew wrote: ``it's not guaranteed''. Which part of ``it's
not guaranteed'' you don't understand?
Indeed. You don't know the answer to my question, so you're attempting
to justify it by changing the question.
I don't need to know the answer, since Steve Summit's C-FAQ
19.4 covered this (``for clearing the screen, a halfway portable
solution is to print a form-feed character ('\f'), which will
cause some displays to clear''). Presumably, those displays that
would clear are still in use.
Tak-Shing
Tak-Shing Chan <t.****@gold.ac .ukwrote:
I don't need to know the answer, since Steve Summit's C-FAQ
rofl...
19.4 covered this (``for clearing the screen, a halfway portable
solution is to print a form-feed character ('\f'), which will
cause some displays to clear''). Presumably, those displays that
would clear are still in use.
The faq does contain some archaisms (and outright errors).
p.s: appeals to authority are generally regarded as inferior to direct
observation - something to consider if you choose to pursue a
technical career ;-)
--
Thomas E. Dickey http://invisible-island.net ftp://invisible-island.net This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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