curs_refresh(3) 					     Library Functions Manual						   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  doup-
       date,  which  compares the virtual screen to the physical screen and does the actual update. If the programmer wants to output several win-
       dows 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)

																   curs_refresh(3)