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56 lines
2 KiB
Plaintext
56 lines
2 KiB
Plaintext
{{DISPLAYTITLE:_MEMNEW}}
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The [[_MEMNEW]] function allocates new memory and returns a [[_MEM]] memory block referring to it.
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{{PageSyntax}}
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: {{Parameter|memoryBlock}} = [[_MEMNEW]]({{Parameter|byteSize}})
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{{Parameters}}
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* The {{Parameter|byteSize}} parameter is the desired byte size of the memory block based on the variable [[type]] it will hold.
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{{PageDescription}}
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* The {{Parameter|memoryBlock}} value created holds the elements .OFFSET, .SIZE, .TYPE and .ELEMENTSIZE.
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* [[_MEMNEW]] does not clear the data previously in the memory block it allocates, for speed purposes.
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* To clear previous data from a new memory block, use [[_MEMFILL]] with a byte value of 0.
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* When a new memory block is created the memory .TYPE value will be 0.
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* '''If the read only memory block .SIZE is 0, the memory block was not created.'''
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* '''All values created by memory functions must be freed using [[_MEMFREE]] with a valid [[_MEM]] variable.'''
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{{PageExamples}}
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''Example:'' Shows how [[SINGLE]] numerical values can be passed, but non-fixed [[STRING]] lengths cannot get the value.
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{{CodeStart}} '' ''
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{{Cl|DIM}} m {{Cl|AS}} {{Cl|_MEM}}
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{{Cl|DIM}} f {{Cl|AS}} {{Cl|STRING}} * 5
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m = {{Cl|_MEMNEW}}(5) 'create new memory block of 5 bytes
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a = 12345.6
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{{Cl|_MEMPUT}} m, m.OFFSET, a 'put single value
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{{Cl|_MEMGET}} m, m.OFFSET, b 'get single value
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{{Cl|PRINT}} "b = "; b
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c$ = "Doggy"
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{{Cl|_MEMPUT}} m, m.OFFSET, c$ 'put 5 byte string value
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{{Cl|_MEMGET}} m, m.OFFSET, d$ 'get unfixed length string value
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{{Cl|_MEMGET}} m, m.OFFSET, f 'get 5 byte string value
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e$ = {{Cl|_MEMGET (function)|_MEMGET}}(m, m.OFFSET, {{Cl|STRING}} * 5) 'get 5 byte string value
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{{Cl|PRINT}} "d$ = "; d$; {{Cl|LEN}}(d$) 'prints empty string
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{{Cl|PRINT}} "e$ = "; e$; {{Cl|LEN}}(e$)
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{{Cl|PRINT}} "f = "; f; {{Cl|LEN}}(f) '' ''
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{{CodeEnd}}
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{{OutputStart}}b = 12345.6
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d$ = 0
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e$ = Doggy 5
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f = Doggy 5 {{OutputEnd}}
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{{PageSeeAlso}}
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* [[_MEM]], [[_MEMPUT]]
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* [[_MEMGET]], [[_MEMGET (function)]]
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* [[_MEMFILL]], [[_MEMFREE]]
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{{PageNavigation}}
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