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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