_MEMFILL - mkilgore/QB64pe GitHub Wiki

The _MEMFILL statement converts a value to a specified type, then fills memory with that type including any non-whole remainder.

_MEMFILL memoryBlock, memoryBlock.OFFSET, fillBytes, value [AS]

• The memoryBlock _MEM memory block is the block referenced to be filled.
• memoryBlock.OFFSET is the starting offset of the above referenced memory block.
• The fillBytes is the number of bytes to fill the memory block.
• The value is the value to place in the memory block at the designated OFFSET position.
• A literal or variable value can be optionally set AS a variable type appropriate for the memory block.

• To clear previous data from a _MEMNEW memory block, use _MEMFILL with a value of 0.

Example: Filling array values quickly using FOR loops or a simple memory fill.

'filling array a with value 13
FOR...NEXT i1 = 0 TO 100
    FOR...NEXT i2 = 0 TO 100
        a(i1, i2) = 13
    NEXT
NEXT

'filling array b with value 13
DIM mema AS _MEM
mema = _MEM (function)(b())
_MEMFILL mema, mema.OFFSET, mema.SIZE, 13 AS LONG
_MEMFREE mema '' ''

• _MEM, _MEM (function)
• _MEMIMAGE, _MEMNEW
• _MEMGET, _MEMPUT