curs_refresh(3X)                 UNIX System V                 curs_refresh(3X)


NAME
      cursrefresh:  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 begline, int numlines);

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 addition 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 programmer 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 window, 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 anything 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 redrawln is preferred over redrawwin where a noisy communication
      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.



10/89                                                                    Page 1

curs_refresh(3X)                 UNIX System V                 curs_refresh(3X)


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), cursoutopts(3X)










































Page 2                                                                    10/89