On Saturday 02 November 2002 18:01, you wrote:
| On Sat, Nov 02, 2002 at 04:00:44PM -0600, John Pitchko wrote:
| > I've been racking my brains out trying to get Perl to write binary
| > files for me. Here is my situation. For my Operating Systems class, we
| > are designing a file system. One of the requirements is that the file
| > system needs to be saved to disk as a binary file. I have a few large
| > array of arrays and hash of hashes in my code, so I was hoping to be
| > able to use Data::Dumper to dump and retireve the data structures.
| > However, I do not know how to open a file in binary mode (from what I
| > understand, binmode() does not work for Unix which is the envrionment
| > where I am coding) or write binary data to that file.
|
| That depends on what you mean by "does not work". I'll assume you're
| not using layers for the moment. If that is the case, then binmode
| doesn't really have any work to do on Unix. You can just read and write
| your binary data. This has been the case since Perl 3, about 13 years
| ago I think.
|
| > I was thinking that I would record the output from Data::Dumper into a
| > scalar and write this scalar in binary mode to the disk. Can anyone
| > give me any help with this????
|
Afaik, binmode doesn't actually do any binary converting. It simply makes
the data in the filehandle from being tainted (keeping it real) and on the
Unix OS's binmode is completely optional although recommended. So, in other
words, if your data isn't already binary then binmode isn't doing anything
for you.
perldoc for binmode:
Arranges for FILEHANDLE to be read or written in
"binary" or "text" mode on systems where the run-
time libraries distinguish between binary and text
files. If FILEHANDLE is an expression, the value
is taken as the name of the filehandle. DISCI-
PLINE can be either of ":raw" for binary mode or
":crlf" for "text" mode. If the DISCIPLINE is
omitted, it defaults to ":raw".
| I would suggest taking a look at Storable.
|
| > All e-mails and attachments are certified virus free!
|
| Phew!
--
- Jim
--
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
