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23 lines
818 B
Plaintext
23 lines
818 B
Plaintext
{{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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::: ret = '''[[_MEMEXISTS]] ('''''memblock''''')'''
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''Details:''
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* The memblock variable name should have been created using [[DIM]] blockname [[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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''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}} |