curs_refresh(3X)                                 curs_refresh(3X)



NAME
     curs_refresh:  refresh, wrefresh, wnoutrefresh, doupdate,
     redrawwin, wredrawln - refresh curses windows and lines

SYNOPSIS
     #include <curses.h>

     int refresh(void);
     int wrefresh(WINDOW *win);
     int wnoutrefresh(WINDOW *win);
     int doupdate(void);
     int redrawwin(WINDOW *win);
     int wredrawln(WINDOW *win, int beg_line, int num_lines);

DESCRIPTION
     The refresh and wrefresh routines (or wnoutrefresh and
     doupdate) must be called to get any output on the terminal,
     as other routines merely manipulate data structures.  The
     routine wrefresh copies the named window to the physical
     terminal screen, taking into account what is already there
     in order to do optimizations.  The refresh routine is the
     same, using stdscr as the default window.  Unless leaveok
     has been enabled, the physical cursor of the terminal is
     left at the location of the cursor for that window.

     The wnoutrefresh and doupdate routines allow multiple
     updates with more efficiency than wrefresh alone.  In addi-
     tion to all the window structures, curses keeps two data
     structures representing the terminal screen:  a physical
     screen, describing what is actually on the screen, and a
     virtual screen, describing what the programmer wants to have
     on the screen.

     The routine wrefresh works by first calling wnoutrefresh,
     which copies the named window to the virtual screen, and
     then calling doupdate, which compares the virtual screen to
     the physical screen and does the actual update.  If the pro-
     grammer wishes to output several windows at once, a series
     of calls to wrefresh results in alternating calls to
     wnoutrefresh and doupdate, causing several bursts of output
     to the screen.  By first calling wnoutrefresh for each win-
     dow, it is then possible to call doupdate once, resulting in
     only one burst of output, with fewer total characters
     transmitted and less CPU time used.  If the win argument to
     wrefresh is the global variable curscr, the screen is
     immediately cleared and repainted from scratch.

     The redrawwin routine indicates to curses that some screen
     lines are corrupted and should be thrown away before any-
     thing is written over them.  These routines could be used
     for programs such as editors, which want a command to redraw
     some part of the screen or the entire screen.  The routine



Page 1                        CX/UX Programmer's Reference Manual

curs_refresh(3X)                                 curs_refresh(3X)



     redrawln is preferred over redrawwin where a noisy communi-
     cation line exists and redrawing the entire window could be
     subject to even more communication noise.  Just redrawing
     several lines offers the possibility that they would show up
     unblemished.

RETURN VALUE
     All routines return the integer ERR upon failure and an
     integer value other than ERR upon successful completion.

NOTES
     The header file <curses.h> automatically includes the header
     files <stdio.h> and <unctrl.h>.

     Note that refresh and redrawwin may be macros.

SEE ALSO
     curses(3X), curs_outopts(3X).





































Page 2                        CX/UX Programmer's Reference Manual