Hello all,

I figured out this problem. It is because the selection system of xwindow
need client to catch event to set or clear the owner of the selection.

I add qApp->processEvents() before I use clipboard object. Everything works
as expected.

Just write this to give some hints to someone if he/she met same problem as
I .

Cheers,
-Max

"Max" wrote in message
news:S%iRa.13722$kI5.509@nwrddc02.gnilink.net...
> Hello all,
>
> It is very strange and I was struggling on it for 2 days.
> I wrote a agent based on qt (QClipboard) to monitor some other
application's
> text, ie GVIM.
>
> I used XTest library to simulate input and mouse event to GVIM, let GVIM
to
> copy its text to clipboard ("+y). Then in the agent, I use
> QApplication::clipboard()->text() to get the clipboard text.
> The strange thing is I can only get the text at first time. After the
second
> operation("+y), the GVIM doesn't copy its text to clipboard.
>
> Also, when I used qt clipboard to set the clipboard content, I got
> QClipboard::setData: Cannot set X11 selection owner for CLIPBOARD error
> messange. I saw the source code or qclipboard. It is because
> XSetSelectionOwner cannot set the owner to clipboard. What's the problem
> with the XSetSelectionOwner?
>
> If I just do this operation by myslef, not automatically by agent, there's
> no any problem.
>
> Did I miss something? I appreciate your help.
>
> Thanks,
> -Max
>
>