64 lines
2.6 KiB
HTML
64 lines
2.6 KiB
HTML
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<HTML>
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<HEAD><TITLE>QuickBASIC 3.0 - Long Entry</TITLE></HEAD>
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<BODY>
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<A HREF="ng16438.html">[<<Previous Entry]</A>
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<A HREF="ng320.html">[^^Up^^]</A>
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<A HREF="ng17428.html">[Next Entry>>]</A>
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<A HREF="menu.html" >[Menu]</A>
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<A HREF="info.html">[About The Guide]</A>
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<HR>
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<PRE>
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<B>KEY(n) Enable/Disable Key Trapping</B>
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<B>KEY</B>(<U>n</U>) {ON | OFF | STOP}
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Enables or disables the trapping of a specified key via ON KEY(<U>n</U>).
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<U>n</U> A numeric expression in the range 1 to 20, specifying the
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key to trap, as follows:
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1-10,30,31 Function keys F1 through F10, F11, F12
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11 Cursor Up
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12 Cursor Left
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13 Cursor Right
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14 Cursor Down
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15-25 Keys defined via KEY <U>n</U>, CHR$(<U>KBflag</U>) +
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CHR$(<U>scancode</U>)
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ON KEY(<U>n</U>) ON activates trapping. If an ON KEY(<U>n</U>) GOSUB
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statement has been executed, QuickBASIC checks before
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executing each statement to see if the specified key has
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been pressed. If it has, QuickBASIC performs the indicated
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GOSUB.
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OFF KEY(<U>n</U>) OFF deactivates trapping.
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STOP KEY(<U>n</U>) STOP also deactivates trapping, but QuickBASIC
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continues checking to see if the specified key has been
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pressed. If it has been pressed, a subsequent KEY(<U>n</U>) ON
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results in an immediate trap (provided an ON KEY(<U>n</U>)
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statement with a nonzero line number has been executed).
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-----------------------------------------------------------------------
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<B>Notes:</B> If the "Checking Between Statements" option is in effect,
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QB checks for communication activity after each statement.
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If the "Event Trapping" option is selected, QB checks
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after each new program line. If neither option is
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selected, no trapping takes place.
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For command-line compilation, /v enables checking after
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each statement, and /w enables checking after each new
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line. If neither switch is used, no trapping takes place.
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</PRE>
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<HR>
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<B>See Also:</B>
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<A HREF="ng1e384.html">ON KEY</A>
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<HR>
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This page created by ng2html v1.05, the Norton guide to HTML conversion utility.
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Written by <A HREF="http://www.acemake.com/hagbard">Dave Pearson</A>
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<HR>
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</BODY>
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</HTML>
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