Re: Being notified of changes to a file
Re: Being notified of changes to a file
- Subject: Re: Being notified of changes to a file
- From: "Vitaly Ovchinnikov" <email@hidden>
- Date: Mon, 21 Jul 2008 19:39:03 +0400
I don't think that you can capture stdout. You need to create a pipe
and redirect your script's output there. And then read from that pipe,
parse and update your progress indicator. A good starting point is
here:
http://www.cocoadev.com/index.pl?NSPipe
On Mon, Jul 21, 2008 at 11:56 AM, Yann Disser <email@hidden> wrote:
> Thanks for your reply.
>
> Hmm, the subject is rather ill chosen. (I started to write the mail and then
> looked a little more into NSPipe before finishing it) My script actually
> writes to stdout.
>
> What I am trying to figure out, is how to respond right away to every single
> line that is written on stdout without waiting for the process to be
> finished.
>
> Perhaps I got something wrong...
>
> Thanks,
> Yann
>
> On 21. Jul 2008, at 0:38, Jens Alfke wrote:
>
>>
>> On 20 Jul '08, at 9:37 AM, Yann Disser wrote:
>>
>>> I am trying to execute a ruby script from within a Cocoa application. I
>>> want to use NSTask (any better ideas?).
>>
>> You can use the Ruby C API to run Ruby inside your process, but that's
>> definitely more work.
>>
>>> My scripts outputs its progress by printing single lines on standard out
>>> containing percentages (e.g. "15%"). How can I update my application
>>> continuously depending on that progress? (for progress bars and other
>>> output)
>>
>> Your subject implies you're writing to a file; don't do that. The Ruby
>> script should write to stdout, and you app should hook up an NSPipe to the
>> NSTask to read its output directly. (This can be a bit tricky, but there's
>> Apple sample code that shows how to do it.)
>>
>> —Jens
>
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