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37 lines
1.2 KiB
Plaintext
37 lines
1.2 KiB
Plaintext
{{QBDLDATE:05-20-2022}}
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{{QBDLTIME:23:08:06}}
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The [[$ERROR]] metacommand triggers a compilation error.
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{{PageSyntax}}
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: [[$ERROR]] MESSAGE
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{{PageDescription}}
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* The Metacommand does '''not''' require a comment or REM before it.
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* MESSAGE is any text. Quotation marks are not required.
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* When QB64 tries to compile an $ERROR metacommand a compilation error is triggered and MESSAGE is shown to the user. This is useful in [[$IF]] blocks.
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{{PageDescription}}
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* If there is a particular situation where you know your program will not work properly, you can prevent the user compiling and give them a helpful error message instead by checking for the condition with [[$IF]].
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* An [[$ERROR]] directive not inside an [[$IF]] (or [[$ELSEIF]]) block is useless because the program will never compile.
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{{PageExamples}}
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{{CodeStart}}
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{{Cl|$IF}} VERSION < 2.1 OR WINDOWS = 0 THEN
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{{Cl|$ERROR}} Requires Windows QB64 version 2.1 or above
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{{Cl|$END IF}}
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{{CodeEnd}}
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''Output'': Compilation check failed: REQUIRES WINDOWS QB64 VERSION 2.1 OR ABOVE on line 2 (assuming your version of QB64 doesn't meet those requirements).
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{{PageSeeAlso}}
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* [[Metacommand]]
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* [[$IF]]
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{{PageNavigation}}
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