QB64-PE/internal/help/_MEMNEW.txt

The '''_MEMNEW''' function allocates new memory and returns a [[_MEM]] memory block referring to it.


{{PageSyntax}}
::: memory_block = '''_MEMNEW(''byte_size'')'''


* The ''memory block'' value created holds the starting OFFSET, SIZE, TYPE and ELEMENTSIZE. 
* The ''byte size'' parameter is the desired byte size of the memory block.
* All values created by memory functions MUST be freed using [[_MEMFREE]] with a valid [[_MEM]] variable type.
* When a new memory block is created the memory .TYPE value will be 0.(this may be changeable in the future)
* '''If the read only memory block .SIZE is 0, the memory block was not created!'''



''Example:'' Shows how [[SINGLE]] numerical values can be passed, but unfixed [[STRING]] lengths cannot get the value.
{{CodeStart}} '' ''
{{Cl|DIM}} m {{Cl|AS}} {{Cl|_MEM}}
{{Cl|DIM}} f {{Cl|AS}} {{Cl|STRING}} * 5
m = {{Cl|_MEMNEW}}(5) 'create new memory block of 5 bytes
a = 12345.6
{{Cl|_MEMPUT}} m, m.OFFSET, a 'put single value
{{Cl|_MEMGET}} m, m.OFFSET, b 'get single value
{{Cl|PRINT}} "b = "; b
c$ = "Doggy"
{{Cl|_MEMPUT}} m, m.OFFSET, c$ 'put 5 byte string value
{{Cl|_MEMGET}} m, m.OFFSET, d$ 'get unfixed length string value
{{Cl|_MEMGET}} m, m.OFFSET, f  'get 5 byte string value
e$ = {{Cl|_MEMGET (function)|_MEMGET}}(m, m.OFFSET, {{Cl|STRING}} * 5) 'get 5 byte string value
{{Cl|PRINT}} "d$ = "; d$; {{Cl|LEN}}(d$) 'prints empty string
{{Cl|PRINT}} "e$ = "; e$; {{Cl|LEN}}(e$)
{{Cl|PRINT}} "f = "; f; {{Cl|LEN}}(f) '' ''
{{CodeEnd}}
{{OutputStart}}b =  12345.6
d$ =  0
e$ = Doggy 5
f = Doggy 5 {{OutputEnd}}



''See also:''
* [[_MEM]], [[_MEMPUT]]
* [[_MEMGET]], [[_MEMGET (function)]]
* [[_MEMFREE]]


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