[Qtwebengine] How do I run web engine on a sever without a display?

[Kevin Truong]

On second thought, what does -platform offscreen do exactly? Is it QT's
implementation of an xvfb-like feature? I am wondering if it is worth my
time to try and pursue debugging -platform offscreen to get it to work on
qt web engine (since it crashes for me too). If -platform offscreen runs qt
web engine without crashing, would it theoretically allow chromium to
render too? Or do I eventually still need to run xvfb to let chromium
render the web page?


On Tue, Dec 8, 2015 at 1:55 PM, Kevin Truong <knt261 at gmail.com> wrote:

> Thanks for the insights everyone -- it seems like xvfb is the way to go to
> use qt web engine for X-less servers. Users have the same issue for
> chromium too as Florian pointed out, and they were advised to just use xvfb.
>
> Reading through phantomjs source code, it seems like they patched WebKit
> via the QPA plug in, which doesn't seem trivial at all!
>
> On Tue, Dec 8, 2015 at 1:15 AM, Nemo <377307289 at qq.com> wrote:
>
>> I also found the app crash with "-platform offscreen".
>>
>>
>> ------------------ 原始邮件 ------------------
>> *发件人:* "Michael Brüning";<michael.bruning at theqtcompany.com>;
>> *发送时间:* 2015年12月8日(星期二) 下午5:06
>> *收件人:* "qtwebengine"<qtwebengine at qt-project.org>;
>> *主题:* Re: [Qtwebengine]回复： How do I run web engine on a sever without a
>> display?
>>
>> Hi all,
>>
>> On 12/08/2015 09:13 AM, Koehne Kai wrote:
>> >> -----Original Message-----
>> >> From: QtWebEngine [mailto:qtwebengine-bounces at qt-project.org] On
>> Behalf
>> >> Of Florian Bruhin
>> >> Sent: Tuesday, December 08, 2015 7:04 AM
>> >> To: Nemo <377307289 at qq.com>
>> >> Cc: qtwebengine <qtwebengine at qt-project.org>
>> >> Subject: Re: [Qtwebengine] 回复： How do I run web engine on a sever
>> without
>> >> a display?
>> >>
>> >> * Nemo <377307289 at qq.com> [2015-12-08 13:58:37 +0800]:
>> >>> Do not call show() member function of widgets, the application will
>> become a
>> >> console application.
>> >>
>> >> Have you actually tried?
>> >>
>> >> It's not that easy. As soon as you want to create a QApplication, you
>> need a
>> >> DISPLAY. And creating a widget without a QApplication won't work.
>> > There's the offscreen QPA plugin to allow this. Start your application
>> with
>> >
>> >    -platform offscreen
>> > And you should be able to use QApplication/QWidget's even without a
>> window.
>> >
>> > Anyhow, there still might be dragons when it comes to QtWebEngine ...
>> Please
>> > keep us up to date :)
>>
>> Unfortunately, this will crash with a SIGSEGV in a non-GUI terminal. Im
>> afraid that for now, the quick fix will be running web engine in xvfb
>> (FWIW, that is also how we used to run LayoutTests on a server with Qt
>> WebKit).
>> >
>> > Regards
>> >
>> > Kai
>> > _______________________________________________
>> > QtWebEngine mailing list
>> > QtWebEngine at qt-project.org
>> > http://lists.qt-project.org/mailman/listinfo/qtwebengine
>>
>> --
>> Best regards,
>> Michael
>>
>>
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>>
>
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