On Mon Jun 24 20:24:25 BST 2013, Eric Frederich wrote:
> I'm trying to tail several files graphically.
> I have been trying to find a way to tail several files in a GUI
> without much luck at all.
[...]
> Basically, I want to graphically tail files and when the GUI closes
> the tail subprocesses are killed.
> Seems like a simple request, but I can't get it right.
I notice that other messages have been talking about solving problems in
your original implementation, but how about trying a different approach?
The simple example below uses QProcess to show the output from a
command. In this case, "tail -f <file>". It will stop the process when the
window is closed, but not the process creating the file, of course.
David
#!/usr/bin/env python
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
class TailWidget(QTextBrowser):
def __init__(self, parent = None):
QTextBrowser.__init__(self, parent)
self.process = QProcess()
self.process.readyReadStandardOutput.connect(self.addStdout)
self.process.readyReadStandardError.connect(self.addStderr)
self.process.finished.connect(self.stop)
self.running = False
def start(self, command, arguments):
if self.running:
return
self.running = True
self.process.start(command, arguments)
def stop(self):
self.running = False
def addStdout(self):
self.append(QString.fromLocal8Bit(self.process.readAllStandardOutput()))
def addStderr(self):
self.append(QString.fromLocal8Bit(self.process.readAllStandardError()))
def closeEvent(self, event):
if self.running:
self.process.terminate()
self.process.waitForFinished(1000)
event.accept()
if __name__ == "__main__":
app = QApplication(sys.argv)
if len(app.arguments()) != 2:
sys.stderr.write("Usage: %s <file>\n" % app.arguments()[0])
sys.exit(1)
w = TailWidget()
w.start("tail", ["-f", app.arguments()[1]])
w.show()
sys.exit(app.exec_())
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