«

Cam wrote:
> I looked up 'top posting' and that was not what I was doing. My reply to
> someone who was kind enough to answer my question was placed under their
> reply.

Yes, it was. Your reply to John Harrison was _before_ the quoted text
(message id <>). That's why "Petec" noted
it to you.

> I shall, however, try to observe netiquette ...

Good.

V

Cam wrote:
>
> I looked up 'top posting' and that was not what I was doing. My reply to
> someone who was kind enough to answer my question was placed under their
> reply. I shall, however, try to observe netiquette ...
>

<pedantic mode on> Here is one of your posts:


Thanks John,

I'll give it a try.

If I want to try and learn non-platform specific C++, where's a good place
to start? Any good books?

Cheers,

Cam


"John Harrison" <> wrote in message
news:...
| > I have converted most of the code to run on the Sun system, but am
unable
| to
| > get the Sun system to recognise # include <conio.h>.
| >
| > Is conio.h a Microsoft only header?
|
| It's a platform specific header
|
| >
| > Will ncurses perform the same job as getche?
|
| It's also platform specific.
|
| Just use getchar as a replacement for getche. It does almost the same
thing
| and its standard so will work on any C++ platform. getchar is declared in
| the header <stdio.h>. There's no need for platform specific functions for
| what you are attempting.
|
| john
|
|
|

<pedantic mode off>

--
Karl Heinz Buchegger

"Cam" <retsigerymmudathotmaildotcom> wrote in message
news:...
>
> OK ... so I have been advised that conio.h and getche are platform
specific
> and that I should use stdio.h and getchar. The problem is that getchar
does
> not seem to work the same way that getche does. Getchar seems to require
> something other than just the keypress.
>

Typically getchar is buffered. It does read exactly one character, but
nothing is read until a whole line has been entered.

There is no exact equivalent for getche in standard C++. Given your
application I can't see the need though.

john

Cam wrote:
[snip]
> I need a non-platform specific function that will accept a single keypress
> and return the character code for the key pressed to allow the placement if
> individual characters into an array.
[snip]

>
> An alternative would be REALLY appreciated.
>
> Thanks to all,
>
> Cheers,
>
> Cam
>
>

Sorry, but there is no standard function for scanning a keyboard
to determine when a key has been pressed or to get the code of
the key that was pressed without buffering.

The problem is that not all platforms are required to have
keyboards. Of those that do have a keyboard, the operating
system will buffer the input so that a user can modify the
input before sending it to a program. This was to spare the
applications from having to process "input editing keystrokes".
Some operating systems allow users to change these settings.

However, you can have your program call a generic function,
such as "Get_Keypress". Inside this function will be a
platform specific call. Create one version for each platform.
Each version will be in a separate file (translation unit).
Have your linking phase include the appropriate file for
the platform you want. This is called creating a "wrapper".
It allows the rest of your program to use one function call
instead having to change the platform specific call everywhere
in your code.

An alternative, is to use preprocessor conditional statements
to isolate the function:

#if PLATFORM_MSDOS
#include <conio.h>

int Get_Keypress(void)
{
return getche();
}

#elseif PLATFORM_UNIX
//...
//...

#else
#include <exceptions>

int Get_Keypress(void)
{
throw std::runtime_error("Platform does not support keypress.");
}

#endif.

So to compile for MS-DOS platform, you would define PLATFORM_MSDOS
in the compiler's command line, such as "-DPLATFORM_MSDOS"


--
Thomas Matthews

C++ newsgroup welcome message:
http://www.slack.net/~shiva/welcome.txt
C++ Faq: http://www.parashift.com/c++-faq-lite
C Faq: http://www.eskimo.com/~scs/c-faq/top.html
alt.comp.lang.learn.c-c++ faq:
http://www.raos.demon.uk/acllc-c++/faq.html
Other sites:
http://www.josuttis.com -- C++ STL Library book

"Cam" <retsigerymmudathotmaildotcom> wrote:

> Hi Rolf,
>
> Please pardon my poor syntax ... I am teaching myself C++ as I go.
>
> The code was written for an assignment and I have written and compiled
> the code using MS VS.NET. The lecturer asked if I could compile the
> code to run on the Unix system used by the Uni.
>
> As the assignment has already been submitted, I do not consider asking
> the NG for help cheating. If I believed that it was cheating, I
> wouldn't do it!

That's good to hear. Anyway, I didn't suspect you were trying to cheat
with this question.

> I have not done a lot of work in C++ and was quite pleased with the
> fact that I was able to write the required code in the first place )
>
> The code was to get the user to input two signed, binary numbers and
> carry out arithmetic on these numbers without converting them to
> decimal to do the actual operations.
>
> I used getche to gather the input from the user and place each bit of
> the input into a separate array element. This made the binary
> processsing much easier.
>
> I have converted most of the code to run on the Sun system, but am
> unable to get the Sun system to recognise # include <conio.h>.
>
> Is conio.h a Microsoft only header?

Yes.

> Will ncurses perform the same job as getche?

I didn't find a funciton getche in ncurses, but there is a function
getch and some other similar functions. ncurses (or curses) is a Un*x
library for console input/output. I think it's avaiable for Windows and
other platforms, too. If it's installed on your Sun system, "man
ncurses" or "man curses" in a shell might get you started. The
function's man page might be available as curs_getch.
Note that this is actually off-topic here, because curses is not a part
of standard C++, so if you have further questions about it, you should
use another newsgroup, like e.g. comp.unix.programmer.

Rolf Magnus writes:

> > Is conio.h a Microsoft only header?
>
> Yes.

No. Borland uses the same header name.

"Cam" <retsigerymmudathotmaildotcom> wrote in message
news:...
> What's "top posting"?

If you quote someone (like I quoted you), then you should type below the
quote, not above it.

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On 2/12/2013 1:45 AM, ajim wrote:
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>

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