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git-svn-id: https://svn.eiffel.com/eiffel-org/trunk@2030 abb3cda0-5349-4a8f-a601-0c33ac3a8c38
50 lines
1.3 KiB
Plaintext
50 lines
1.3 KiB
Plaintext
[[Property:uuid|5CA34C5D-30F1-4D6F-9FE4-B555E541EA8C]]
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[[Property:weight|4000]]
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[[Property:title|Managing CTRL+C in console application]]
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Normally, if the user use the CTRL+C keys, the Eiffel application detect it as an error and throw an exception of type <code>OPERATING_SYSTEM_SIGNAL_FAILURE</code>.
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To manage the CTRL+C keys, you can use a <code>rescue</code> clause to detect the exception and a <code>retry</code> mecanism to cancel the exception handeling done by the Eiffel runtime.
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To detect the exception, you can <code>inherit</code> from the <code>EXCEPTIONS</code> class and use an attachment test on <code>Exception_manager.last_exception</code>.
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<code>
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note
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description: "Show how to quit an application using CTRL+C (without trace)."
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author: "Louis Marchand"
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date: "Wed, 25 Apr 2018 23:12:33 +0000"
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revision: "0.1"
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class
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APPLICATION
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inherit
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EXCEPTIONS
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create
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make
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feature {NONE} -- Initialization
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make
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-- Launch `Current'.
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local
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l_ctrl_c:BOOLEAN
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do
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if not l_ctrl_c then
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from until False loop
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io.standard_default.put_string ("Press CTRL+C%N")
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io.input.read_line
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end
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else
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io.standard_default.put_string ("%NClosing...%N")
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end
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rescue
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if attached {OPERATING_SYSTEM_SIGNAL_FAILURE}
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Exception_manager.last_exception then
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l_ctrl_c := True
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retry
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end
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end
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end
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</code> |