mirror of
https://github.com/QB64-Phoenix-Edition/QB64pe.git
synced 2024-09-19 16:45:06 +00:00
27 lines
905 B
Text
27 lines
905 B
Text
|
{{QBDLDATE:05-20-2022}}
|
||
|
{{QBDLTIME:23:09:09}}
|
||
|
{{DISPLAYTITLE:_MEMEXISTS}}
|
||
|
The [[_MEMEXISTS]] function returns true (-1) if the memory block variable name specified exists in memory and false (0) if it does not.
|
||
|
|
||
|
|
||
|
{{PageSyntax}}
|
||
|
: {{Parameter|result}} = [[_MEMEXISTS]]({{Parameter|memBlock}})
|
||
|
|
||
|
|
||
|
{{PageDescription}}
|
||
|
* The {{Parameter|memBlock}} variable name must have been created using [[DIM]] memBlock [[AS]] [[_MEM]] type ([[DIM]].
|
||
|
* The function verifies that the memory variable exists in memory before using a passed block, to avoid generating QB64 errors.
|
||
|
* Typically, this function is used by a [[DECLARE LIBRARY|LIBRARY]] [[SUB]] or [[FUNCTION]] which accepts a [[_MEM]] structure as input, to avoid an error.
|
||
|
|
||
|
|
||
|
{{Parameter|See Also:}}
|
||
|
* [[_MEM (function)]]
|
||
|
* [[_MEMELEMENT]], [[_MEMCOPY]]
|
||
|
* [[_MEMIMAGE]], [[_MEMNEW]]
|
||
|
* [[_MEMGET]], [[_MEMPUT]]
|
||
|
* [[_MEMFILL]], [[_MEMFREE]]
|
||
|
|
||
|
|
||
|
{{PageNavigation}}
|
||
|
|