Curses Library Functions                    cursrefresh(3CURSES)



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

SYNOPSIS
     cc [ flag ... ] file ... -lcurses [ library ... ]
     #include 

     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 termi-
     nal, as other routines merely  manipulate  data  structures.
     The routine wrefresh() copies the named window to the physi-
     cal 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 ter-
     minal 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 vir-
     tual  screen  to  the  physical  screen  and does the actual
     update. If the programmer wishes to output  several  windows



SunOS 5.11          Last change: 31 Dec 1996                    1






Curses Library Functions                    cursrefresh(3CURSES)



     at  once,  a series of calls to wrefresh() results in alter-
     nating  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 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
     redrawln()  is preferred over redrawwin() where a noisy com-
     munication 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 VALUES
     All routines return the integer  ER  upon  failure  and  an
     integer value other than ER upon successful completion.

ATRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     
           ATRIBUTE TYPE               ATRIBUTE VALUE       
    
     MT-Level                     Unsafe                      
    


SEE ALSO
     cursoutopts(3CURSES), curses(3CURSES), attributes(5)

NOTES
     The header   automatically  includes  the  headers
      and .


     Note that refresh() and redrawwin() may be macros.







SunOS 5.11          Last change: 31 Dec 1996                    2