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Perl in a Nutshell

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Win32 Modules and Extensions
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$cons->WriteAttr(attrs, col, row)

Writes the attributes contained in the string attrs, beginning at col, row, without affecting the characters that are on screen. The string attrs can be the result of a ReadAttr function, or you can build your own attribute string; in this case, keep in mind that every attribute is treated as a character, not a number (see example). Returns the number of attributes written, or undef on error.

$CONSOLE->WriteAttr($attrs, 0, 0);
# note the use of chr()...
$attrs = chr($FG_BLACK | $BG_WHITE) x 80; 
$CONSOLE->WriteAttr($attrs, 0, 0);

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