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_wgetscreenbuf
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─────Run-Time Library───────────────────────────────────────────────────────
Include: <io.h>
Syntax: long _wgetscreenbuf( int wfh );
Returns: Current screen-buffer size (in bytes) or the value
_WINBUFINF, or -1 if not successful.
See also: _fwopen, _wabout, _wclose, _wgetexit, _wgetfocus,
_wgetsize, _wmenuclick, _wopen, _wsetexit, _wsetfocus,
_wsetscreenbuf, _wsetsize, _wyield
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