mirror of
https://github.com/QB64Official/qb64.git
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99 lines
4.1 KiB
Text
99 lines
4.1 KiB
Text
{{DISPLAYTITLE:_FREEFONT}}
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The [[_FREEFONT]] statement frees a font handle that was created by [[_LOADFONT]].
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{{PageSyntax}}
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:[[_FREEFONT]] ({{Parameter|fontHandle&}})
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{{PageDescription}}
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* Unloads fonts that are no longer in use or needed in order to free program memory and resources.
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* You cannot free a font which is in use. Change the font to a QB64 default font size before freeing the handle (see example below).
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* Predefined '''QB64''' font handle numbers can be used before freeing a font:
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**'''_FONT 8 ''' - default font for [[SCREEN (statement)|SCREEN]] 1, 2, 7, 8 or 13
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**'''_FONT 14''' - default font for [[SCREEN (statement)|SCREEN]] 9 or 10
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**'''_FONT 16''' - default font for [[SCREEN (statement)|SCREEN]] 0 ({{KW|WIDTH}} 80, 25 text only), 11 or 12
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**'''_FONT 9, 15''' and '''17''' are the double width versions of 8, 14 and 16 respectively in text '''SCREEN 0'''.
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* If the font handle is invalid (equals -1 or 0), an [[ERROR Codes|error]] will occur. '''Check handle values before using or freeing them.'''
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* You cannot free inbuilt/default QB64 fonts nor do they ever need freed.
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{{PageExamples}}
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''Example 1:'' Previews and creates a file list of valid MONOSPACE TTF fonts by checking the [[_LOADFONT]] handle values.
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{{CodeStart}} '' ''
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{{Cl|SCREEN (statement)|SCREEN}} 12
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path$ = "C:\WINDOWS\Fonts\" 'path to the font folder
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{{Cl|SHELL}} {{Cl|_HIDE}} "DIR /b " + path$ + "\*.ttf > TTFonts.INF"
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style$ = "monospace" 'set style to MONOSPACE
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{{Cl|OPEN}} "TTFonts.INF" {{Cl|FOR (file statement)|FOR}} {{Cl|INPUT (file mode)|INPUT}} {{Cl|AS}} #1 'list of TTF fonts only
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{{Cl|OPEN}} "TTFMono.INF" {{Cl|FOR (file statement)|FOR}} {{Cl|OUTPUT}} {{Cl|AS}} #2 'will hold list of valid MONOSPACE fonts
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{{Cl|DO}} {{Cl|UNTIL}} {{Cl|EOF}}(1): found = found + 1
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{{Cl|LINE INPUT (file statement)|LINE INPUT}} #1, font$
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f& ={{Cl|_LOADFONT}}(path$ + font$, 30, style$)
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{{Cl|IF}} f& > 0 {{Cl|THEN}} 'check for valid handle values > 0
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OK = OK + 1
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{{Cl|PRINT (file statement)|PRINT}} #2, font$
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{{Cl|_FONT}} f& 'will create error if handle is invalid!
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{{Cl|PRINT}} "Hello World!"
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{{Cl|PRINT}}: {{Cl|PRINT}}: {{Cl|PRINT}} font$; f&
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{{Cl|PRINT}} "Press any key."
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K$ = {{Cl|INPUT$}}(1)
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{{Cl|_FONT}} 16 'use QB64 default font to free tested font
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{{Cl|_FREEFONT}} f& 'returns an error if handle <= 0!
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{{Cl|CLS}}
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{{Cl|END IF}}
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{{Cl|PRINT}}
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{{Cl|IF}} K$ = {{Cl|CHR$}}(27) {{Cl|THEN}} {{Cl|EXIT DO}}
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{{Cl|LOOP}}
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{{Cl|CLOSE}}
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{{Cl|PRINT}}: {{Cl|PRINT}}: {{Cl|PRINT}} "Found"; found; "TTF files,"; OK; "can use Monospace,"
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{{Cl|END}} '' ''
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{{CodeEnd}}
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{{small|Code by Ted Weissgerber}}
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{{OutputStart}}
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Found 106 TTF files, 13 can use Monospace.
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{{OutputEnd}}
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''Example 2:'' Using a _FREEFONT sub-procedure.
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{{CodeStart}}
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fontpath$ = {{Cl|ENVIRON$}}("SYSTEMROOT") + "\fonts\lucon.ttf"
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style$ = "MONOSPACE, ITALIC, BOLD"
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fontsize% = 20
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{{Cl|_FONT|_FONT }}16
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{{Cl|PRINT}}
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{{Cl|PRINT}} "This is the QB64 default {{Cl|_FONT|_FONT }}16! To change, press any key!"
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{{Cl|DO}}: {{Cl|SLEEP}}: {{Cl|LOOP}} {{Cl|UNTIL}} {{Cl|INKEY$}} <> ""
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{{Cl|GOSUB}} ClearFont 'call will not free anything if font& = 0
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font& = {{Cl|_LOADFONT}}(fontpath$, fontsize%, style$)
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{{Cl|IF}} font > 0 THEN {{Cl|_FONT|_FONT}} font& 'NEVER try to load a font value less than 1!
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{{Cl|PRINT}}
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{{Cl|PRINT}} "A NEW {{Cl|_FONT|_FONT}} style. To change to default, press any key!"
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{{Cl|DO}}: {{Cl|SLEEP}}: {{Cl|LOOP}} {{Cl|UNTIL}} {{Cl|INKEY$}} <> ""
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{{Cl|GOSUB}} ClearFont 'call will free a valid font handle from memory
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{{Cl|END}}
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ClearFont:
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{{Cl|IF}} font& > 0 {{Cl|THEN}}
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{{Cl|_FONT|_FONT }}16 'change used font to the QB64 8x16 default font
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{{Cl|_FREEFONT}} font&
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{{Cl|PRINT}}: {{Cl|PRINT}} "The previous font was freed with _FREEFONT!"
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{{Cl|ELSE}} : {{Cl|PRINT}}: {{Cl|PRINT}} "_FREEFONT was not used!"
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{{Cl|END IF}}
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{{Cl|RETURN}} '' ''
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{{CodeEnd}}
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{{PageSeeAlso}}
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* [[_FONT]]
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* [[_LOADFONT]]
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{{PageNavigation}}
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