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| '''Metacommands''' are program wide commands that start with $. | | '''{{Text|Metacommands|blue}} are commands that start with {{Text|dollar sign ($)|blue}}. Those commands usually switch the program between different operation modes/behavior or provide extended functionality.''' |
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| ==Legacy Metacommands (QBasic/QuickBASIC)== | | ==Legacy Metacommands (QBasic/QuickBASIC)== |
| ===Syntax===
| | :*Legacy metacommands are normally used at the program start, they should have their own program line and must be commented with an ''[[Apostrophe|']]'' or [[REM]]. |
| :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. | |
| * QBasic Metacommands are always prefixed with $ and MUST be commented with an apostrophe or [[REM]].
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| * [[$INCLUDE]] is always followed by a colon and the full text code file name is commented on both sides.
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| * [[$DYNAMIC]] allows larger arrays that are changeable in size at runtime.
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| * [[$STATIC]] makes all arrays unchangeable in size.
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| * '''QBasic metacommands should have their own program line because they are commented.'''
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| ==QB64 Metacommands== | | ==QB64 Metacommands== |
| ===Syntax===
| | :*QB64 metacommands must not necessarily used at the program start. However, it's still the best location for some of it (see individual descriptions). |
| :[[$CHECKING]]{OFF|ON} 'disables QB64 C++ event and error checking (no spaces) | | :*QB64 metacommands must not be commented with an ''[[Apostrophe|']]'' or [[REM]], but should have their own program line too. |
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| :[[$CONSOLE]] 'creates a QB64 console window throughout the program
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| :[[$RESIZE]]:{ON|OFF} 'determines if re-sizing of the program screen by the user is allowed(no spaces)
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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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| :[[$EXEICON]]:'iconfile.ico' 'embeds an .ICO file into the final executable (Windows only)
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| :[[$VERSIONINFO]]:key=value 'embeds version info metadata into the final executable (Windows only)
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| :[[$IF]]...[[$END IF]] 'precompiler directive
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| ===Description=== | | ==OB64 Precompiler Commands== |
| * [[$INCLUDE]] can be used at the beginning or at the end of program SUB procedures.
| | :*These are a special type of ''{{Text|QB64 Metacommands|blue}}'', which allow for conditional compiling, hence including or excluding certain code sections depending on given conditions. |
| * [[$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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| * [[$CONSOLE]] creates a console window which can be turned off later with [[_CONSOLE]] OFF.
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| * [[$RESIZE]]:ON allows a user to resize the program window. OFF is default. | |
| * [[$SCREENHIDE]] hides the QB64 program window throughout the program until [[$SCREENSHOW]] is used.
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| * [[$IF]]...[[$END IF]] allows selective inclusion of code in the final program.
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| * '''Do not comment out with ' or [[REM]] QB64-specific metacommands.'''
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| * [[DIM]], [[REDIM]] | | * [[DIM]], [[REDIM]] |
| * [[ON TIMER(n)]] | | * [[ON TIMER(n)]] |
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| {{PageNavigation}} | | {{PageNavigation}} |
Metacommands are commands that start with dollar sign ($). Those commands usually switch the program between different operation modes/behavior or provide extended functionality.
Legacy Metacommands (QBasic/QuickBASIC)
- Legacy metacommands are normally used at the program start, they should have their own program line and must be commented with an ' or REM.
QB64 Metacommands
- QB64 metacommands must not necessarily used at the program start. However, it's still the best location for some of it (see individual descriptions).
- QB64 metacommands must not be commented with an ' or REM, but should have their own program line too.
OB64 Precompiler Commands
- These are a special type of QB64 Metacommands, which allow for conditional compiling, hence including or excluding certain code sections depending on given conditions.
See also
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Keyword Reference - Alphabetical
Keyword Reference - By usage
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