[Interest] Redirect stdout to a file

[Scott Aron Bloom]

Yes that is exactly what I do..

From: Yifei Li [mailto:yifli82 at gmail.com]
Sent: Monday, July 1, 2013 7:29 PM
To: Scott Aron Bloom
Cc: interest at qt-project.org
Subject: Re: [Interest] Redirect stdout to a file

Hi Scott,

What I'm trying to do is exactly the same as what you did.

Can you confirm the following is how you made it?  In my experiment, the following way makes the newly created process terminate when the GUI crashes.

QProcess *proc = new QProcess;
connect(proc, SIGNAL(readyReadStandardError()), this SLOT(readStderr()));
proc->start();

Thanks,

Yifei

On Mon, Jul 1, 2013 at 6:28 PM, Scott Aron Bloom <scott.bloom at onshorecs.com<mailto:scott.bloom at onshorecs.com>> wrote:
Im completely confused on what you are trying to do..

I can tell you that, I have a QProcess variable, and I have attached to the "stdout/stderr available signals".. When they trigger, I get the stdout and stderr

And if the GUI crtashes while the CLI call is running, the CLI keeps running.

Scot

From: Yifei Li [mailto:yifli82 at gmail.com<mailto:yifli82 at gmail.com>]
Sent: Monday, July 01, 2013 3:21 PM

To: Scott Aron Bloom
Cc: interest at qt-project.org<mailto:interest at qt-project.org>
Subject: Re: [Interest] Redirect stdout to a file

So is there a way to achieve what I want? -Yifei

On Mon, Jul 1, 2013 at 6:15 PM, Scott Aron Bloom <scott.bloom at onshorecs.com<mailto:scott.bloom at onshorecs.com>> wrote:
Yes, calling proc.startDetached still calls the static version

From: Yifei Li [mailto:yifli82 at gmail.com<mailto:yifli82 at gmail.com>]
Sent: Monday, July 01, 2013 2:53 PM
To: Scott Aron Bloom
Cc: interest at qt-project.org<mailto:interest at qt-project.org>

Subject: Re: [Interest] Redirect stdout to a file

I just tried, and it does not work. Redirection only works if 'proc->start()'. -Yifei

On Mon, Jul 1, 2013 at 5:39 PM, Scott Aron Bloom <scott.bloom at onshorecs.com<mailto:scott.bloom at onshorecs.com>> wrote:
Yes...



From: interest-bounces+scott.bloom=onshorecs.com at qt-project.org<mailto:onshorecs.com at qt-project.org> [mailto:interest-bounces+scott.bloom<mailto:interest-bounces%2Bscott.bloom>=onshorecs.com at qt-project.org<mailto:onshorecs.com at qt-project.org>] On Behalf Of Yifei Li
Sent: Monday, July 01, 2013 2:25 PM

To: interest at qt-project.org<mailto:interest at qt-project.org>
Subject: Re: [Interest] Redirect stdout to a file

Hi Scott,

Are you suggesting something as follows?
QProcess proc;
proc.setStandardOutputFile();
proc.startDetached();

Yifei



On Mon, Jul 1, 2013 at 5:08 PM, Scott Aron Bloom <scott.bloom at onshorecs.com<mailto:scott.bloom at onshorecs.com>> wrote:
If the goal, is to redirect stdout/stderr, and not have the call block (static startDetached).

You can still use the NON-static version of the start method

Scott

From: interest-bounces+scott.bloom=onshorecs.com at qt-project.org<mailto:onshorecs.com at qt-project.org> [mailto:interest-bounces+scott.bloom<mailto:interest-bounces%2Bscott.bloom>=onshorecs.com at qt-project.org<mailto:onshorecs.com at qt-project.org>] On Behalf Of Yifei Li
Sent: Monday, July 01, 2013 1:58 PM
To: interest at qt-project.org<mailto:interest at qt-project.org>

Subject: Re: [Interest] Redirect stdout to a file

I guess dup2 needs to be called by the process, correct? But I can't change its src code. - Yifei

On Mon, Jul 1, 2013 at 4:42 PM, Guido Seifert <wargand at gmx.de<mailto:wargand at gmx.de>> wrote:

If it is only Linux you could use dup2.

Windows? No idea.

Guido


On Mon, 1 Jul 2013 16:31:19 -0400
Yifei Li <yifli82 at gmail.com<mailto:yifli82 at gmail.com>> wrote:

> Hi folks,
>
> I know this can be done using QProcess::setStandardOutputFile.
>
> However, I need to start my process using the static function
> startDetached, and still want to be able to redirect its stdout/stderr to
> another file.
>
> Any suggestions?
>
> Thanks,
>
> Yifei
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