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https://github.com/QB64-Phoenix-Edition/QB64pe.git
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6e01fc8dce
Added new _STRCMP and _STRICMP commands for quick string comparisons. Cleaned up QB64 to finish removing the QUI (quick user insert) code and folders. Altered UCASE and LCASE routines to be faster in some situations for us.
67 lines
2.5 KiB
Plaintext
67 lines
2.5 KiB
Plaintext
'''DEF SEG''' is used to define the area in memory to access QB64's emulated conventional memory.
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{{PageSyntax}}
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:: DEF SEG [=][{segment|VARSEG(variable}]
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* Used to set the pointer to a memory area of a variable/array or register.
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* [[PEEK]] and [[POKE]] require a segment memory address (often just 0) without using VARSEG.
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* Important segments using [[PEEK]] and [[POKE]] include &HB800 (text segment) and &HA000 (graphics segment).
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* [[BSAVE]] and [[BLOAD]] require a VARSEG reference to the grahic array(0 index) used.
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* ALWAYS use DEF SEG when the procedure is completed to reset the segment to Qbasic's default value!
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* '''Warning: DEF SEG, VARSEG , VARPTR, PEEK or POKE access QB64's emulated 16 bit conventional memory block!'''
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: '''It is highly recommended that QB64's [[_MEM]] memory system be used to avoid running out of memory.'''
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''Example:'' In a Qbasic(ONLY) file delete, '''SEG''' forces the parameter to be passed as a far pointer.
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{{CodeStart}} '' ''
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{{Cl|CONST}} file = "trashme.tmp" 'example temporary file name to delete
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{{Cl|DEFINT}} A-Z
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{{Cl|DIM}} filename {{Cl|AS}} {{Cl|STRING}}
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{{Cl|DIM}} result {{Cl|AS}} {{Cl|LONG}}
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{{Cl|DIM}} t {{Cl|AS}} {{Cl|STRING}}
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{{Cl|DIM}} i {{Cl|AS}} {{Cl|INTEGER}}
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{{Cl|CONST}} codelen = 48
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{{Cl|DIM}} code {{Cl|AS}} {{Cl|STRING}} * codelen
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{{Cl|CLS}}
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t = "5589E51E8B560C8EDA8B5E0A8B5702B441CD218B56088EDA8B5E06720B6631C0"
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t = t + "6689071F5DCA0800660D0000FFFFEBF0"
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{{Cl|FOR...NEXT|FOR}} i = 0 {{Cl|TO}} codelen - 1
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{{Cl|MID$}}(code, i + 1, 1) = {{Cl|CHR$}}({{Cl|VAL}}("&h" + {{Cl|MID$}}(t, i + i + 1, 2)))
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{{Cl|NEXT}}
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{{Cl|OPEN}} file {{Cl|FOR...NEXT|FOR}} {{Cl|APPEND}} {{Cl|AS}} 1 'create temporary file
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{{Cl|PRINT (file statement)|PRINT}} #1, "I am doomed! :-("
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{{Cl|CLOSE}}
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{{Cl|PRINT}} "now you see it:"
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{{Cl|SHELL}} "dir " + file
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K$ = {{Cl|INPUT$}}(1)
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filename = file + {{Cl|CHR$}}(0) 'create zero string name for DOS
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{{Cl|DEF SEG}} = {{Cl|VARSEG}}(code)
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{{Cl|CALL}} absolute('''SEG''' filename, '''SEG''' result, {{Cl|VARPTR}}(code))
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{{Cl|IF...THEN|IF}} result {{Cl|THEN}} 'check results
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{{Cl|PRINT}} "oops. error: 0x"; {{Cl|HEX$}}(result {{Cl|AND (boolean)|AND}} {{Cl|&H}}FFFF&)
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{{Cl|ELSE}}
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{{Cl|PRINT}} "now you don't:"
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{{Cl|END IF}}
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{{Cl|SHELL}} "dir " + file
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{{Cl|END}} '' ''
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{{CodeEnd}}
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{{small|Code by Michael Calkins as Public Domain(2011)}}
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''See also:''
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* [[DEF SEG = 0]]
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* [[VARPTR]], [[VARSEG]]
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* [[PEEK]], [[POKE]]
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* [[BSAVE]], [[BLOAD]]
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{{PageNavigation}} |