Xnest embedded in a QWidget

[Jupiter_80]

I do need to display a remote Xnest terminal without close button, for this purpose I feel forced to embed this Xnest in a Qwidget without borders and as a consequence

According to Xnest documentation, we have the option "-parent"

-parent window_id This option tells Xnest to use window_id as the root window instead of creating a window.

Taking into account this option I have done the following:

...
windowContainer = new QWidget();
...
QProcess process;
process.setProcessChannelMode(QProcess::ForwardedChannels);
QString program("Xnest");
QStringList args;
args << "-query " << ip << " -parent" << QString::number(windowContainer.winId(), 16).prepend("0x") << ":1";

process.start(program, args);

However, after executing Xnest I got the following error:

X Error of failed request: BadAccess (attempt to access private resource denied)
Major opcode of failed request: 2 (X_ChangeWindowAttributes)
Serial number of failed request: 252
Current serial number in output stream: 253

This happens when I add the option "-parent".

Please, I would appreciate if you could help me.

Thanks in advance.

[mrjj]

Hi and welcome
Have you tried with other window to verify -parent does work?
Maybe try to use xprop to see the ID directly ?

[Jupiter_80]

Yes, I tried with another window to discard WindowId was wrong, but it failed again.

[mrjj]

@Jupiter_80
It also failed with other non Qt window?

[Jupiter_80]

The problem appears when I try to run Xnest as a child.

bash$ display /home/user/images/example.png &

bash$ xwininfo |grep id:
-> parent window ID

bash$ Xnest -parent 0x2000011 :1

Produced error message:

X Error of failed request: BadAccess (attempt to access private resource denied)
Major opcode of failed request: 2 (X_ChangeWindowAttributes)
Serial number of failed request: 69
Current serial number in output stream: 70

[mrjj]

@Jupiter_80
Hi
Yes, I also tried with both Qt and non Qt windows.
I cannot get -parent to work at all.

Did you have it work with any non Qt window?

[Jupiter_80]

Unfortunatelly, it does not work even with a Non Qt Window.

[mrjj]

@Jupiter_80
Hi, i didn't have any luck either. (with Xnest)
I wonder if
http://manpages.ubuntu.com/manpages/wily/man1/Xephyr.1.html
might be an option?

[Jupiter_80]

Thanks but it is mandatory to use Xnest in our system ....