mirror of
https://github.com/QB64-Phoenix-Edition/QB64pe.git
synced 2024-07-05 21:40:25 +00:00
69 lines
2 KiB
Plaintext
69 lines
2 KiB
Plaintext
{{DISPLAYTITLE:_MEM (function)}}
|
|
The '''_MEM''' function returns a _MEM block referring to the largest possible continuous memory region beginning at variable's offset.
|
|
|
|
|
|
{{PageSyntax}}
|
|
::: memory_block = '''_MEM(''reference_ variable'')'''
|
|
|
|
Unsecure {{PageSyntax}}
|
|
::: memory_block = '''_MEM(''offset'', ''byte_size'')'''
|
|
|
|
|
|
{{Parameters}}
|
|
* The ''memory block'' created will hold the ''reference variable''' or [[arrays|array]] value(s), type and byte size in a separate memory area.
|
|
* The secure syntax ''reference variable'' is an existing variable's referenced memory block.
|
|
* The unsecure syntax's designated ''offset'' and ''byte size'' cannot be guaranteed! '''AVOID if possible!'''
|
|
|
|
|
|
''Usage:''
|
|
* The ''memory block'' [[_MEM]] type variable holds the read only OFFSET, SIZE, TYPE and ELEMENTSIZE.
|
|
* All values created by memory functions MUST be freed using [[_MEMFREE]] with a valid [[_MEM]] variable type.
|
|
* '''_MEM function cannot reference variable length [[STRING]] variable values! String values must be designated as a fixed [[LEN]].'''
|
|
|
|
|
|
''Example:'' Assigning values to reference variables in memory.
|
|
{{CodeStart}} '' ''
|
|
{{Cl|DIM}} {{Cl|SHARED}} m(3) {{Cl|AS}} {{Cl|_MEM}}
|
|
{{Cl|DIM}} {{Cl|SHARED}} Saved(3)
|
|
|
|
m(1) = {{Cl|_MEM (function)|_MEM}}(x)
|
|
m(2) = {{Cl|_MEM (function)|_MEM}}(y)
|
|
m(3) = {{Cl|_MEM (function)|_MEM}}(z)
|
|
|
|
x = 3: y = 5: z = 8
|
|
{{Cl|PRINT}} x, y, z
|
|
Save x, y, z
|
|
x = 30: y = 50: z = 80
|
|
{{Cl|PRINT}} x, y, z
|
|
|
|
RestoreIt
|
|
{{Cl|PRINT}} x, y, z
|
|
|
|
{{Cl|_MEMFREE}} m(1)
|
|
{{Cl|_MEMFREE}} m(2)
|
|
{{Cl|_MEMFREE}} m(3)
|
|
{{Cl|END}}
|
|
|
|
{{Cl|SUB}} Save (n1, n2, n3)
|
|
Saved(1) = n1
|
|
Saved(2) = n2
|
|
Saved(3) = n3
|
|
{{Cl|END SUB}}
|
|
|
|
{{Cl|SUB}} RestoreIt
|
|
{{Cl|_MEMPUT}} m(1), m(1).OFFSET, Saved(1)
|
|
{{Cl|_MEMPUT}} m(2), m(2).OFFSET, Saved(2)
|
|
{{Cl|_MEMPUT}} m(3), m(3).OFFSET, Saved(3)
|
|
{{Cl|END SUB}} '' ''
|
|
{{CodeEnd}}{{small|Code by SMcNeill}}
|
|
|
|
|
|
''See also:''
|
|
* [[_MEM]] {{text|(varible type)}}
|
|
* [[_MEMNEW]], [[_MEMCOPY]]
|
|
* [[_MEMGET]], [[_MEMPUT]]
|
|
* [[_MEMFILL]], [[_MEMIMAGE]]
|
|
* [[_MEMFREE]]
|
|
|
|
|
|
{{PageNavigation}} |