$ERROR

The $ERROR metacommand triggers a compilation error.

Syntax

$ERROR message

Description

• 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.

Description

• 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 conditional $IF (or $ELSEIF) block is useless because the program will never compile in that case.

Examples

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

Output (IDE Status Area)

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

See also

• Metacommand
• $IF

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