Thanks, Dar. I might play around with "process", but it sounds like
the file route is the way to go for now.
Best,
Mark
On 4 Dec 2006, at 22:52, Dar Scott wrote:
On Dec 4, 2006, at 5:24 AM, Mark Smith wrote:
There are some shell commands (openssl sha1, for example) that
take their arguments from stdin or a file, but not the command
line. While it's easy to write data to a file and pass the
filepath to the shell, it's not very efficient if you want to do
it many times in succession.
What you want is process i/o. See 'open process' etc.
There are some problems. You have to do a half-close. That is,
you need to close the pipe to the tool without closing the pipe
from the tool.
Revolution tries to do a half-close with a a control character (04,
EOT, Control-D), but that doesn't work well.
On OS X you cannot do a half-close with binary. This was done to
fix a concern (bz 1770).
On OS X this does do a half-close with text mode, but there seems
to be something fishy with the line ends in text mode. Anybody
know what is wrong with the line ends in this case? This needs a
bz but I'm not sure what is up. I've tried this with sort and
things don't get sorted.
On XP it gets a little mixed up with ^X or ^Z, I forgot which.
That is, Rev thinks it closed the pipe for ^D, but the application
thinks it is still open. Maybe you can send ^X^Z^D and something
will happen. I have some notes someplace but I don't think they
were enough to bugzilla.
As you can see, I'm not clear on this. We do need a half close
command for open process and open socket.
If the tool reads a fixed number of lines or characters, you might
be OK. You don't have to do the half close.
I do have some other bugs reported on process I/O and some bugs
that are not ready for bz on process I/O.
I'd go with the file for the input with shell() for now. If the
output is binary, then you should use a file for output, too, on
Windows. I have not had a problem with binary output on OS X.
Note that passwords are often not input with stdin even though they
look like it.
Dar
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