$ERROR: Difference between revisions

Revision as of 16:04, 15 June 2022

The $ERROR metacommand triggers a compilation error.

$ERROR Message

This Metacommand does not require a comment or REM before it.
Message is any text. Quotation marks are not required.
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.

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.
An $ERROR directive not inside an $IF (or $ELSEIF) block is useless because the program will never compile.

$IF VERSION < 2.1 OR WINDOWS = 0 THEN
    $ERROR Requires Windows QB64 version 2.1 or above
$END IF

Output (IDE Status Line): Compilation check failed: REQUIRES WINDOWS QB64 VERSION 2.1 OR ABOVE on line 2 (assuming your version of QB64 doesn't meet those requirements).

@@ Line 23: / Line 23: @@
 {{Cl|$END IF}}
 {{CodeEnd}}
-''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).
+;Output (IDE Status Line):Compilation check failed: REQUIRES WINDOWS QB64 VERSION 2.1 OR ABOVE on line 2 (assuming your version of QB64 doesn't meet those requirements).