Different scan code behavior in X and console

Different scan code behavior in X and console

[郭晓峰]

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Hi there,

Sorry to bother. Not sure whether it is correct to post this question
to the mail list, but can't find a suitable linux console user mail
list for discussing this. If you have good mail list to suggest,
please help me to forward. Thanks!

The question is: I tried to make my emacs have the same key response
on both X and console (ssh pts). However, I can't find scan code for
"Ctrl-PageDown" in console mode. I attached the code for testing the
scan code, and below is different behavior in X and console:

============= X ===========
Press a Key 338   // Just type <PageDown>
Press a Key 27
Press a Key 91
Press a Key 54
Press a Key 59
Press a Key 53
Press a Key 126  // 6-chars for <Ctrl-PageDown>
============ Console =========
Press a Key 338  // Same for <PageDown>
Press a Key         // No response for <Ctrl-PageDown>

Any idea on this? Greatly appreciate your replies, your suggested
readings, and so on!

Best Regards,
Lamu Guo

=============Below is text of the code, for easily reading to skip
attachment=================

#include <stdlib.h>
#include <ctype.h>
#include <curses.h>

int main(void)
{
  WINDOW *_window = initscr();
  int _rows;
  int _cols;

  cbreak();

  /* Accept all keys */
  keypad(_window, true);

  /* Don't echo things that are typed */
  noecho();

  /* Get the screen dimensions */
  getmaxyx(_window, _rows, _cols);

  /* Don't display cursor */
  curs_set(0);

  for (;;)
  {
    printw("Press a Key ");
    refresh();
    int key = wgetch(_window);
    printw("%d \n", key);
  }

  endwin();

  return 0;
}

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#include <stdlib.h>
#include <ctype.h>
#include <curses.h>

int main(void)
{
  WINDOW *_window = initscr();
  int _rows;
  int _cols;

  cbreak();

  /* Accept all keys */
  keypad(_window, true);

  /* Don't echo things that are typed */
  noecho();

  /* Get the screen dimensions */
  getmaxyx(_window, _rows, _cols);

  /* Don't display cursor */
  curs_set(0);

  for (;;)
  {
    printw("Press a Key ");
    refresh();
    int key = wgetch(_window);
    printw("%d \n", key);
  }

  endwin();

  return 0;
}

Re: Different scan code behavior in X and console

[郭晓峰]

OK, I got it. Ctrl-PageDown is remapped by Mac and Windows, it works in Linux.

Please skip this problem, it doesn't related to Linux.

On Sat, Jan 14, 2012 at 4:52 PM, 郭晓峰 <lamuguo@gmail.com> wrote:
> Hi there,
>
> Sorry to bother. Not sure whether it is correct to post this question
> to the mail list, but can't find a suitable linux console user mail
> list for discussing this. If you have good mail list to suggest,
> please help me to forward. Thanks!
>
> The question is: I tried to make my emacs have the same key response
> on both X and console (ssh pts). However, I can't find scan code for
> "Ctrl-PageDown" in console mode. I attached the code for testing the
> scan code, and below is different behavior in X and console:
>
> ============= X ===========
> Press a Key 338   // Just type <PageDown>
> Press a Key 27
> Press a Key 91
> Press a Key 54
> Press a Key 59
> Press a Key 53
> Press a Key 126  // 6-chars for <Ctrl-PageDown>
> ============ Console =========
> Press a Key 338  // Same for <PageDown>
> Press a Key         // No response for <Ctrl-PageDown>
>
> Any idea on this? Greatly appreciate your replies, your suggested
> readings, and so on!
>
> Best Regards,
> Lamu Guo
>
> =============Below is text of the code, for easily reading to skip
> attachment=================
>
> #include <stdlib.h>
> #include <ctype.h>
> #include <curses.h>
>
> int main(void)
> {
>  WINDOW *_window = initscr();
>  int _rows;
>  int _cols;
>
>  cbreak();
>
>  /* Accept all keys */
>  keypad(_window, true);
>
>  /* Don't echo things that are typed */
>  noecho();
>
>  /* Get the screen dimensions */
>  getmaxyx(_window, _rows, _cols);
>
>  /* Don't display cursor */
>  curs_set(0);
>
>  for (;;)
>  {
>    printw("Press a Key ");
>    refresh();
>    int key = wgetch(_window);
>    printw("%d \n", key);
>  }
>
>  endwin();
>
>  return 0;
> }
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