da...@ieee.org wrote:
(You forgot to send this message to the list, so I'm forwarding it)
mj...@iol.pt wrote:
da...@ieee.org wrote:
mj...@iol.pt wrote:
<div class="moz-text-flowed" style="font-family: -moz-fixed">I'm
wondering if I must save a file to memory before opening it. By
opening I mean displaying it to the user.
I have a BLOB field in a db and I have managed to read the blob
into a binary fileobject. I've also managed to write it to disk
and then I open it by doubleclicking on it. But I was wondering:
1. How to open the file directly from code (and not by double clicking):
I'm aware of os.startfile on Win by I'm on a Mac now, so I rather
have a cross-platform way of accomplishing this.
2. If there is any Python module that takes care of saving and
cleaning temp files in an OS transparent way?
Txs,
Miguel
You don't say what this binary data is. Is there a specific
program that should be launched to "display it to the user" ? Or
do you have to keep this general?
If you know what the necessary program is, you could use
subprocess module to launch it. But I don't know enough about the
Mac to know how to do the Mac equivalent of os.startfile
As for avoiding the use of a file, that depends entirely on the
program you're launching. Some programs can be told to get their
data from stdin. If that's the case, there's a way to provide
stdin directly from Python, using subprocess.
As for temporary files, consider tempfile module. I haven't used
it, but it looks promising. HTH,
DaveA
I know what the binary data is from the database. Typically it
would be some file the OS knows how to open.
Chiefly I'm trying to avoid making the user save the file on some
location and then go and double click it to open it. This makes no
sense, since the user has already made the decision to open the file.
Miguel
Txs Dave.
You forgot to answer the question. You say "The OS knows how to
open". Does *your* *program* know what program is needed, to open
this particular binary data?
Yes. My program knows. A database column stores the complete file name
(including extension), and I can be certain the applications will be
available to run the file.
Miguel
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