> This is probably one that's staring me in the face, but I cannot get
it to
> work.  I have a Sub with string passed ByRef, but changes made to the
string
> inside the Sub don't affect the string passed, which they definitely
should.

Actually, the problem is a subtle one...


>   a$ =
>
"00000000000000000000000000000000000000000000000000000000000000000000000
0000
> 00000"
>   For i = 1 To 10000
>     DoEvents
>     mutate (a$): Debug.Print a$
>   Next i

See those parentheses you have around the a$ variable? Either add the
keyword "Call" in front of the "mutate" Sub's name or remove the
parentheses. In VB, the syntax for a Sub is

     Call YourSubName(Argument)

or

     YourSubName Argument

The problem is that when you use parentheses that are not part of the
syntax for a statement, VB **evaluates** the contents of the parentheses
(even if no calculation is required)... what is getting passed to your
Sub, and being changed by your Sub, is the temporary address in memory
where the evaluation is taking place at and NOT your variable's address
in memory. Adhere to one of the two proper syntaxes for a call to a Sub
and your problem will disappear.

Rick - MVP
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