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  38 <TITLE>curs_scr_dump 3x 2023-12-30 ncurses 6.4 Library calls</TITLE>
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  43 <H1 class="no-header">curs_scr_dump 3x 2023-12-30 ncurses 6.4 Library calls</H1>
  44 <PRE>
  45 <STRONG><A HREF="curs_scr_dump.3x.html">curs_scr_dump(3x)</A></STRONG>                Library calls               <STRONG><A HREF="curs_scr_dump.3x.html">curs_scr_dump(3x)</A></STRONG>
  46
  47
  48
  49
  50 </PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
  51        <STRONG>scr_dump</STRONG>,  <STRONG>scr_restore</STRONG>,  <STRONG>scr_init</STRONG>, <STRONG>scr_set</STRONG> - read/write a <EM>curses</EM> screen
  52        from/to a file
  53
  54
  55 </PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
  56        <STRONG>#include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>
  57
  58        <STRONG>int</STRONG> <STRONG>scr_dump(const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>filename</EM><STRONG>);</STRONG>
  59        <STRONG>int</STRONG> <STRONG>scr_restore(const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>filename</EM><STRONG>);</STRONG>
  60        <STRONG>int</STRONG> <STRONG>scr_init(const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>filename</EM><STRONG>);</STRONG>
  61        <STRONG>int</STRONG> <STRONG>scr_set(const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>filename</EM><STRONG>);</STRONG>
  62
  63
  64 </PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
  65        <EM>curses</EM> provides applications the ability to write the contents  of  the
  66        screen  to  a  file and read them back.  To read/write a window (rather
  67        than the whole screen) from/to a file, use <STRONG><A HREF="curs_util.3x.html">getwin(3x)</A></STRONG>  and  <STRONG><A HREF="curs_util.3x.html">putwin(3x)</A></STRONG>,
  68        respectively.
  69
  70
  71 </PRE><H3><a name="h3-scr_dump">scr_dump</a></H3><PRE>
  72        <STRONG>scr_dump</STRONG>  writes  to  <EM>filename</EM>  the contents of the virtual screen; see
  73        <STRONG><A HREF="curs_variables.3x.html">curscr(3x)</A></STRONG>.
  74
  75
  76 </PRE><H3><a name="h3-scr_restore">scr_restore</a></H3><PRE>
  77        <STRONG>scr_restore</STRONG> updates the virtual  screen  to  contain  the  contents  of
  78        <EM>filename</EM>  (if  it  was  validly  written with <STRONG>scr_dump</STRONG>).  No refresh is
  79        performed;  after  performing  any  further   desired   updates,   call
  80        <STRONG><A HREF="curs_refresh.3x.html">doupdate(3x)</A></STRONG> or similar.
  81
  82
  83 </PRE><H3><a name="h3-scr_init">scr_init</a></H3><PRE>
  84        <STRONG>scr_init</STRONG>  reads <EM>filename,</EM> using it to initialize <EM>curses</EM> data structures
  85        describing the state of the terminal screen.  If these data are  valid,
  86        <EM>curses</EM>  bases  its next update of the screen on this information rather
  87        than clearing it and starting from scratch.
  88
  89        The data fail the validity check
  90
  91        <STRONG>o</STRONG>   if the terminal employs <EM>terminfo</EM> capabilities <STRONG>exit_ca_mode</STRONG>  (<STRONG>rmcup</STRONG>)
  92            or <STRONG>non_rev_rmcup</STRONG> (<STRONG>nrrmc</STRONG>) are defined, or
  93
  94        <STRONG>o</STRONG>   if  <EM>curses</EM>  knows  that  the terminal has been written to since the
  95            preceding <STRONG>scr_dump</STRONG> call.
  96
  97        <STRONG>scr_init</STRONG> could be used after <STRONG><A HREF="curs_initscr.3x.html">initscr(3x)</A></STRONG>  or  <STRONG>system(3)</STRONG>  to  share  the
  98        screen with another process that has done a <STRONG>scr_dump</STRONG> after <STRONG><A HREF="curs_initscr.3x.html">endwin(3x)</A></STRONG>.
  99
 100
 101 </PRE><H3><a name="h3-scr_set">scr_set</a></H3><PRE>
 102        The  <STRONG>scr_set</STRONG>  routine is a combination of <STRONG>scr_restore</STRONG> and <STRONG>scr_init</STRONG>.  It
 103        tells the program that the information in <EM>filename</EM> is what is currently
 104        on the screen, and also what the program wants on the screen.  This can
 105        be thought of as a screen inheritance function.
 106
 107
 108 </PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
 109        These functions return <STRONG>OK</STRONG> on success and <STRONG>ERR</STRONG> on failure.
 110
 111        X/Open defines no failure conditions.   In  this  implementation,  each
 112        function fails if it cannot open <EM>filename.</EM>
 113
 114
 115 </PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
 116        <STRONG>scr_init</STRONG>, <STRONG>scr_set</STRONG>, and <STRONG>scr_restore</STRONG> may be macros.
 117
 118
 119 </PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
 120        X/Open Curses, Issue 4, describes these functions.
 121
 122        SVr4 omitted the <EM>const</EM> qualifiers.
 123
 124        SVr4  documentation  describes <STRONG>scr_init</STRONG> such that the dump data is also
 125        considered invalid "if the time-stamp of the tty is old" but  does  not
 126        define "old".
 127
 128
 129 </PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
 130        <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>,    <STRONG><A HREF="curs_initscr.3x.html">curs_initscr(3x)</A></STRONG>,    <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>,    <STRONG><A HREF="curs_util.3x.html">curs_util(3x)</A></STRONG>,
 131        <STRONG>system(3)</STRONG>, <STRONG><A HREF="scr_dump.5.html">scr_dump(5)</A></STRONG>
 132
 133
 134
 135 ncurses 6.4                       2023-12-30                 <STRONG><A HREF="curs_scr_dump.3x.html">curs_scr_dump(3x)</A></STRONG>
 136 </PRE>
 137 <div class="nav">
 138 <ul>
 139 <li><a href="#h2-NAME">NAME</a></li>
 140 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
 141 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
 142 <ul>
 143 <li><a href="#h3-scr_dump">scr_dump</a></li>
 144 <li><a href="#h3-scr_restore">scr_restore</a></li>
 145 <li><a href="#h3-scr_init">scr_init</a></li>
 146 <li><a href="#h3-scr_set">scr_set</a></li>
 147 </ul>
 148 </li>
 149 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
 150 <li><a href="#h2-NOTES">NOTES</a></li>
 151 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
 152 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
 153 </ul>
 154 </div>
 155 </BODY>
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