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82 lines
3.6 KiB
Text
82 lines
3.6 KiB
Text
'''Metacommands''' are program wide commands that start with $.
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==Legacy metacommands (QBasic/QuickBASIC)==
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===Syntax===
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:REM [[$INCLUDE]]: '[[QB.BI]]' 'loads a reference file or library
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:REM [[$DYNAMIC]] 'enables resizing of array dimensions with REDIM
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:REM [[$STATIC]] 'arrays cannot be resized once dimensioned
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===Description===
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* QBasic metacommands are normally used at the program start and are in effect throughout the program.
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* QBasic metacommands are always prefixed with <code>$</code> and MUST be commented with [[apostrophe|']] or [[REM]].
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* [[$INCLUDE]] is always followed by a colon and the full filename must be included in single quotes.
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* [[$DYNAMIC]] allows larger arrays that are changeable in size at runtime.
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* [[$STATIC]] makes all arrays unchangeable in size.
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* '''QBasic metacommands should have their own program line because they are commented.'''
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==QB64 metacommands==
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===Syntax===
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:[[$ASSERTS]][:CONSOLE] 'enables assertions
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:[[$CHECKING]]:{ON|OFF} 'disables QB64 C++ event and error checking (no spaces)
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:[[$COLOR]]:{0|32} 'adds named color constants to the program
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:[[$CONSOLE]][:ONLY] 'creates a QB64 console window throughout the program
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:[[$ERROR]] message 'triggers a compilation error, useful inside $IF blocks
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:[[$EXEICON]]:'iconfile.ico' 'embeds an .ICO file into the final executable (Windows only)
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:[[$IF]]...[[$END IF]] 'precompiler conditional directive
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:[[$LET]] variable = expression 'defines precompiler flags
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:[[$NOPREFIX]] 'allows QB64 keywords without the leading <code>_</code>
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:[[$RESIZE]]:{ON|OFF|STRETCH|SMOOTH} 'determines if re-sizing of the program screen by the user is allowed
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:[[$SCREENHIDE]] 'hides the QB64 program window throughout the program
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:[[$SCREENSHOW]] 'displays the main QB64 program window
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:[[$VERSIONINFO]]:key=value[, ...] 'embeds version info metadata into the final executable (Windows only)
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:[[$VIRTUALKEYBOARD]]:{ON|OFF} 'enables the virtual keyboard (Deprecated)
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===Description===
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* [[$INCLUDE]] can be used at the beginning or at the end of program SUB procedures.
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* [[$ASSERTS]] enables the [[_ASSERT]] macro.
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* [[$CHECKING]] '''OFF''' should only be used with '''errorless''' code where every CPU cycle counts! Use '''ON''' to re-enable event checking. Event checking can be turned OFF or ON throughout a program.
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* [[$COLOR]] includes named color constants in a program.
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* [[$CONSOLE]] creates a console window which can be turned off later with [[_CONSOLE]] OFF.
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* [[$EXEICON]] embeds a designated icon file into the compiled EXE file. (Windows ONLY)
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* [[$ERROR]] MESSAGE causes a compilation error whenever QB64 attempts to compile it, displaying MESSAGE to the user. This is useful if inside a $IF block, as the error can be conditional.
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* [[$IF]]...[[$END IF]] allows selective inclusion of code in the final program.
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* [[$LET]] used to set a flag variable for the precompiler.
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* [[$NOPREFIX]] allows all QB64 functions and statements to be used without the leading underscore (_).
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* [[$RESIZE]] allows a user to resize the program window. OFF is default.
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* [[$SCREENHIDE]] hides the QB64 program window throughout the program until [[$SCREENSHOW]] is used.
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* [[$VERSIONINFO]] adds metadata to Windows only binaries for identification purposes across the OS.
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* [[$VIRTUALKEYBOARD]] turns the virtual keyboard ON or OFF for use in touch-enabled devices. (DEPRECATED)
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* '''Do not comment out with [[apostrophe|']] or [[REM]] QB64-specific metacommands.'''
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{{PageSeeAlso}}
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* [[OPTION_BASE|OPTION BASE]], [[OPTION_EXPLICIT|OPTION _EXPLICIT]], [[OPTION_EXPLICITARRAY|OPTION _EXPLICITARRAY]]
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* [[Statement]], [[Function (explanatory)]]
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* [[REM]]
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* [[DIM]], [[REDIM]]
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* [[ON TIMER(n)]]
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{{PageNavigation}}
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