From: Richard Dale <Richard_Dale@...>
Date: 2004-12-17T12:02:12+09:00
Subject: Re: rubyqt,   popen  problem in a log viewer

Richard Dale wrote:
> You could start 'tail' with a Qt::Process instead of popen(), as it ties
> in with Qt signals/slots 

> and shuts down the sub process on application 
> exit
Actually I'm wrong - Qt doesn't do this, you need to connect to the
'aboutToQuit()' application signal, and kill the 'tail' process on exit:

        @proc = Qt::Process.new(self) {
            addArgument "/usr/bin/tail"
            addArgument "-f"
            addArgument "/tmp/test"
        } 
                
        connect( @proc, SIGNAL('readyReadStdout()'),
                 self, SLOT('readFromStdout()') )

        connect( $kapp, SIGNAL('aboutToQuit()'),
                  self, SLOT('shutdown()') )   
        @proc.start
    end
        
    slots 'readFromStdout()', 'shutdown()'
        
    def readFromStdout
        lines = @proc.readStdout
        @hello.append lines.to_s
    end
        
    def shutdown
        @proc.kill
    end

-- Richard