I would separate the two independent access methods:
```
try
io = zlibopen
do_sth(io)
close(io)
catch
io = open
do_sth(io)
close(io)
end
```
If you want another try block to ensure the file is closed, I'd open
secondary try blocks within this one. I think you're trying to do two
things at once -- see whether zlib is needed, and also check for I/O errors.
Incidentally, you don't need a `finally` clause for the regular `open`
function; you can instead write
```
contents = open(fn, "r") do io
do_sth(io)
end
```
which ensures that `io` will be closed no matter what.
-erik
On Sun, Dec 6, 2015 at 8:16 PM, Seth <catch...@bromberger.com> wrote:
> Hi,
>
> I'm moving from Gzip.jl to Libz.jl, and am running into a problem. Gzip
> used to allow a file to be opened using its methods even if the file was
> not encrypted. Libz doesn't allow that.
>
> The problem I'm having is that I can't figure out a try/catch/finally that
> works. Basically, I want this (pseudocode):
>
> io = ZlibInflateInputStream(open(fn,"r")) # this will succeed if fn
> exists, even if fn isn't compressed
> contents = try
> do_something_with_io(io) # this will error if fn isn't compressed
> catch
> io = open(fn,"r") # so we try to open it as an uncompressed file
> do_something_with_io(io)
> finally
> close(io)
> end
>
> but this doesn't work (the finally statement fails, for one).
>
> What's the accepted way of doing this?
>
--
Erik Schnetter <schnet...@gmail.com>
http://www.perimeterinstitute.ca/personal/eschnetter/
