Re:Re: Monitoring stdout in (more or less) real time
29.08.2009 2:21 пользователь Gabriel Genellina написал: En Sat, 29 Aug 2009 03:28:26 -0300, ivanko@gmail.com> escribió: Hello to everyone! I am making a program that will be a GTK+ frontend to ffmpeg. Naturally, one of the main functions is parsing ffmpeg's output. It's pretty simple when I, for example, retrieve information about a file (the program finishes and I read the output). But it also needs to parse working ffmpeg's output (in order to retrieve the percentage, remaining time, etc.). So, actually what I do is Popen ffmpeg, and connect to its stdout. And as stdout is represented by a file object, it needs to be read(). The problem is that read() reads until EOF is reached, which doesn't exist while the program is running (the same goes with communicate()). So my question is: is there a way to retrieve the stdout without waiting the program to finish? You don't have to read the complete output at once - you may process it line by line, I presume. I'd use a second thread to read the pipe and put the lines onto a Queue object; the main thread gets lines from the Queue when available. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list Thanks, Gabriel, but I resolved that problem in another way. thrashold in irc.freenode.net gave me the solution. What i do now is: p = Popen(["cmd","arg"],stdout=PIPE,stderr=STDOUT) fcntl.fcntl(p.stdout.fileno(), fcntl.F_SETFL, os.O_NONBLOCK) p.stdout.read() And in that way p.stdout.read() doesn't wait the program to finish, but gives me instant response. But anyway, thanks! =) -- http://mail.python.org/mailman/listinfo/python-list
Re: Monitoring stdout in (more or less) real time
En Sat, 29 Aug 2009 03:28:26 -0300, escribió: Hello to everyone! I am making a program that will be a GTK+ frontend to ffmpeg. Naturally, one of the main functions is parsing ffmpeg's output. It's pretty simple when I, for example, retrieve information about a file (the program finishes and I read the output). But it also needs to parse working ffmpeg's output (in order to retrieve the percentage, remaining time, etc.). So, actually what I do is Popen ffmpeg, and connect to its stdout. And as stdout is represented by a file object, it needs to be read(). The problem is that read() reads until EOF is reached, which doesn't exist while the program is running (the same goes with communicate()). So my question is: is there a way to retrieve the stdout without waiting the program to finish? You don't have to read the complete output at once - you may process it line by line, I presume. I'd use a second thread to read the pipe and put the lines onto a Queue object; the main thread gets lines from the Queue when available. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Monitoring stdout in (more or less) real time
Hello to everyone! I am making a program that will be a GTK+ frontend to ffmpeg. Naturally, one of the main functions is parsing ffmpeg's output. It's pretty simple when I, for example, retrieve information about a file (the program finishes and I read the output). But it also needs to parse working ffmpeg's output (in order to retrieve the percentage, remaining time, etc.). So, actually what I do is Popen ffmpeg, and connect to its stdout. And as stdout is represented by a file object, it needs to be read(). The problem is that read() reads until EOF is reached, which doesn't exist while the program is running (the same goes with communicate()). So my question is: is there a way to retrieve the stdout without waiting the program to finish? PS. I think it might be redirected to a "normal", existing file, but may be there are more optimal ways. I will be grateful for any answer! And sorry for my English =) -- http://mail.python.org/mailman/listinfo/python-list
