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