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47 lines
1.7 KiB
Text
47 lines
1.7 KiB
Text
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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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::: memory_block = '''_MEMNEW(''byte_size'')'''
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* The ''memory block'' value created holds the starting OFFSET, SIZE, TYPE and ELEMENTSIZE.
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* The ''byte size'' parameter is the desired byte size of the memory block.
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* All values created by memory functions MUST be freed using [[_MEMFREE]] with a valid [[_MEM]] variable type.
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* When a new memory block is created the memory .TYPE value will be 0.(this may be changeable in the future)
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* '''If the read only memory block .SIZE is 0, the memory block was not created!'''
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''Example:'' Shows how [[SINGLE]] numerical values can be passed, but unfixed [[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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''See also:''
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* [[_MEM]], [[_MEMPUT]]
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* [[_MEMGET]], [[_MEMGET (function)]]
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* [[_MEMFREE]]
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{{PageNavigation}}
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