Index for Section 3

Alphabetical listing for C

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curs_refresh(3)
NAME
  curs_refresh, doupdate, redrawwin, refresh, wrefresh, wnoutrefresh,
  wredrawln - Refresh Curses windows and lines

SYNOPSIS
  #include <curses.h>

  int doupdate(
	  void );

  int redrawwin(
	  WINDOW *win );

  int refresh(
	  void );

  int wrefresh(
	  WINDOW *win );

  int wnoutrefresh(
	  WINDOW *win );

  int wredrawln(
	  WINDOW *win,
	  int beg_line,
	  int num_lines );

LIBRARY
  Curses Library (libcurses)

STANDARDS
  Interfaces documented on this reference page conform to industry standards
  as follows:

  doupdate, redrawwin, wredrawln, refresh, wrefresh,
  wnoutrefresh:	 XCURSES4.2

  Refer to the standards(5) reference page for more information about
  industry standards and associated tags.

DESCRIPTION
  Applications must call the refresh and wrefresh routines (or the
  wnoutrefresh and doupdate routines) to get any output on the terminal.
  Other Curses routines only manipulate data structures. The wrefresh routine
  copies the specified window to the physical terminal screen, taking into
  account what is already there in order to do optimizations. The refresh
  routine does the same operation on stdscr.  Unless leaveok is enabled,
  Curses leaves the physical cursor of the terminal 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
  specified 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 wants 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.  If the program
  first calls wnoutrefresh for each window, it is then possible to call
  doupdate once, resulting in only one burst of output, with transmission of
  fewer characters overall and less use of CPU time. If the win argument to
  wrefresh is the global variable curscr, Curses immediately clears the
  screen and repaints the window from scratch.

  The redrawwin routine tells Curses that some screen lines are corrupted and
  should be thrown away before anything is written over them. This routine
  could be used in programs, such as editors, that need 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. In this case, redrawing only several lines offers the possibility
  that they would appear unblemished.

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

  Note that refresh may be a macro.

RETURN VALUES
  All routines return the integer ERR upon failure and OK upon successful
  completion.

SEE ALSO
  Functions: curses(3), curs_outopts(3)

  Others: standards(5)

Index for Section 3

Alphabetical listing for C

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