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59 lines
1.3 KiB
Plaintext
59 lines
1.3 KiB
Plaintext
''This page is maintained for historic purposes. The keyword is not supported in QB64.''
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----
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The SIGNAL keyword was reserved for OS/2 systems (protected mode). See the example for more information about how and why it is used.
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{{PageSyntax}}
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:: [[ON]] SIGNAL(number) [[GOSUB]] line
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:: SIGNAL(number) [[ON]]
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*'''[[Keywords currently not supported by QB64|Not supported in QB64.]]'''
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* It will only work with compiler 6.00 and 6.00b and Basic PDS 7.00 when compiling in protected mode under OS/2. In all other situations, a SIGNAL statement results in an "Advanced feature unavailable" error message.
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''Example:''
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{{CodeStart}}
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'' ''
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{{Cl|PRINT}} "This program traps CTRL+BREAK in OS/2. Try it."
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{{Cl|ON}} SIGNAL(4) {{Cl|GOSUB}} trap
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{{Cl|SIGNAL}}(4) {{Cl|ON}}
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10 a$ = {{Cl|INKEY$}}
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{{Cl|IF...THEN|IF}} a$ = "" {{Cl|THEN}} {{Cl|GOTO}} 10
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{{Cl|END}}
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trap:
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{{Cl|PRINT}} "CTRL+BREAK trapped. Press any key to quit"
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{{Cl|RETURN}} '' ''
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{{CodeEnd}}
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''Output:'' It returns the following when Ctrl-Break is pressed
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{{OutputStart}}
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This program traps CTRL+BREAK in OS/2. Try it.
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CTRL+BREAK trapped. Press any key to quit
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{{OutputEnd}}
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''Error message in QB4.5 if not using OS 2:''
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{{OutputStart}}
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Advanced feature unavailable
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{{OutputEnd}}
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''Source:'' Microsoft KB41389 [[http://support.microsoft.com/kb/41389]]
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''See also:''
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* [[ON KEY (n)]]
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{{PageNavigation}}
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