Qt5 and embedwidgets

[anda_skoa]

Using a low level thread and having it emit a signal is most likely the problem because the slot will likely be called in the secondary thread's context and not in the one handling the UI.

My recommendation is to try something simpler first, e.g. letting the rasterwindow program write its winId to stdout (followed by newline and maybe flush), which you then read in the main application through QProcess (see signal readyReadStandardOutput())

That way you can test the child process manually, e.g. start it in a shell window and see if it correctly outputs its window id.

i'd also recommend that you put some empty placeholder widget into the central widget and when you got the winId and have create the window container, you put the window container into a layout in that placeholder.
You obviously need to keep a pointer to that placerholder as a member of the main window instance so you can access it from the slot connected to readyReadStandardOutput()

Cheers,
_

[PstdEr]

Thanks anda_skoa,
i will try what you said,but before that i would like let you know the output i am getting with current program.

When i run the raster example alone i am getting the window id printed in Qt Creator Log.
and also if i run container first and raster second seperately i am able to receive the winid in the container but the window is not embedded into it.

logs when running rasterwindow
In RasterWindow
before mq_open
window id is : 121634822
window id int : 121634822
mq_open success
window id sent is 121634822

logs when running container

in Main
MainWindow
thread create success
Init unable to unlink
mq_open success
window id received is : 121634822
unlink success
In launch_app

some times i am getting below errors:

QXcbConnection: XCB error: 8 (BadMatch), sequence: 1131, resource id: 121634822, major code: 1 (CreateWindow), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 1134, resource id: 109051937, major code: 18 (ChangeProperty), minor code: 0

[anda_skoa]

It might be helpful to see the actual code of launch_app()
the one you posted will obviously never embed the window since the widget is never added to any layout.

Cheers,
_