QB64-website/wiki/_MEMEXISTS.md

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

See Also

• _MEM (function)
• _MEMELEMENT, _MEMCOPY
• _MEMIMAGE, _MEMNEW
• _MEMGET, _MEMPUT
• _MEMFILL, _MEMFREE