_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.


Syntax

result = _MEMEXISTS(memBlock)


Description

  • The 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 LIBRARY SUB or FUNCTION which accepts a _MEM structure as input, to avoid an error.


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