keypad.3cur

<B>Digital的Unix操作系统VAX 4.2源码</B>

.TH keypad 3cur 
.SH Name
keypad \- enable keypad
.SH Syntax
.br
.B
#include <cursesX.h>
.PP
.B
int keypad(win, bf)
.br
.B
WINDOW \(**win;
.br
.B
bool bf;
.SH Description
.NXR "keypad subroutine"
This option enables the keypad of the user's terminal.
If the keypad is enabled, 
pressing a function key 
(such as an arrow key)
will return a single value representing the function key.
For example, pressing the left arrow key results in the
value 
KEY_LEFT being returned..
For more information see the
.I
Guide to X/Open Curses Screen-Handling.
.R
.PP
The routine 
.PN getch 
is used to return the character.
If 
the keypad
is disabled,
.PN curses
does not treat function keys as special keys and the program
interprets the escape sequences itself.
Keypad layout is terminal dependent;
some terminals do not even have a keypad.
.SH Return Values
The
.PN keypad
function returns OK on success and ERR on error.
.SH See Also
getch(3cur)
.br
.I Guide to X/Open Curses Screen-Handling