getch() in linux

getch() in linux

[Siddu]

Hi all,

Please help me understand whats the use of getch() in linux

the man page says this ! but couldnt comprehend much out of it

 The getch, wgetch, mvgetch and mvwgetch, routines read a character
from the window.  In no-delay mode, if no input is waiting,
 the value ERR is returned.  In delay mode, the program waits until
the system passes text through to the  program.   Depending
 on  the setting of cbreak, this is after one character (cbreak mode),
or after the first newline (nocbreak mode).  In half-de‐
 lay mode, the program waits until a character is typed or the
specified timeout has been reached.

what is delay mode they are talking about?

and can some one give me a simple example for it ?

do i ave to know abt ncurses to understand it ?


--
Regards,
~Sid~
I have never met a man so ignorant that i couldn't learn something from him




--
Regards,
~Sid~
I have never met a man so ignorant that i couldn't learn something from him
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Re: getch() in linux

[vinit dhatrak]

On Sat, Oct 24, 2009 at 3:04 PM, Siddu <siddu.sjce@gmail.com> wrote:
> Hi all,
>
> Please help me understand whats the use of getch() in linux
>
> the man page says this ! but couldnt comprehend much out of it
>
>  The getch, wgetch, mvgetch and mvwgetch, routines read a character
> from the window.  In no-delay mode, if no input is waiting,
>  the value ERR is returned.  In delay mode, the program waits until
> the system passes text through to the  program.   Depending
>  on  the setting of cbreak, this is after one character (cbreak mode),
> or after the first newline (nocbreak mode).  In half-de‐
>  lay mode, the program waits until a character is typed or the
> specified timeout has been reached.
>
> what is delay mode they are talking about?
>
> and can some one give me a simple example for it ?
>
> do i ave to know abt ncurses to understand it ?
>
>
> --
> Regards,
> ~Sid~
> I have never met a man so ignorant that i couldn't learn something from him
>
>
>
>
> --
> Regards,
> ~Sid~
> I have never met a man so ignorant that i couldn't learn something from him
> --
> To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

Yes, you have to know about ncurses to understand this function.
Have a look at this,

http://tldp.org/HOWTO/NCURSES-Programming-HOWTO/index.html

Also, check man pages for halfdelay or timeout.
A simple "Hello World" program will give you some idea.

-Vinit
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