_MEMNEW - QB64Official/qb64 GitHub Wiki

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

Syntax

memoryBlock = _MEMNEW(byteSize)

Parameter(s)

  • The byteSize parameter is the desired byte size of the memory block based on the variable Variable Types it will hold.

Description

  • The memoryBlock value created holds the elements .OFFSET, .SIZE, .TYPE and .ELEMENTSIZE.
  • _MEMNEW does not clear the data previously in the memory block it allocates, for speed purposes.
  • To clear previous data from a new memory block, use _MEMFILL with a byte value of 0.
  • When a new memory block is created the memory .TYPE value will be 0.
  • If the read only memory block .SIZE is 0, the memory block was not created.
  • All values created by memory functions must be freed using _MEMFREE with a valid _MEM variable.

Example(s)

Shows how SINGLE numerical values can be passed, but non-fixed STRING lengths cannot get the value.


DIM m AS _MEM
DIM f AS STRING * 5
m = _MEMNEW(5) 'create new memory block of 5 bytes
a = 12345.6
_MEMPUT m, m.OFFSET, a 'put single value
_MEMGET m, m.OFFSET, b 'get single value
PRINT "b = "; b
c$ = "Doggy"
_MEMPUT m, m.OFFSET, c$ 'put 5 byte string value
_MEMGET m, m.OFFSET, d$ 'get unfixed length string value
_MEMGET m, m.OFFSET, f  'get 5 byte string value
e$ = _MEMGET(m, m.OFFSET, STRING * 5) 'get 5 byte string value
PRINT "d$ = "; d$; LEN(d$) 'prints empty string
PRINT "e$ = "; e$; LEN(e$)
PRINT "f = "; f; LEN(f) 



b =  12345.6
d$ =  0
e$ = Doggy 5
f = Doggy 5

See Also