Unknown module(s) in QT: webkitwidgets

[Nite Coder]

I have been trying to use Qt WebEngine, but I need to add it to my .pro file. I tried adding 'webkitwidgets', but all I get is the error 'Unknown module(s) in QT: webkitwidgets'. I would appreciate some help. Thanks in advance!
Note

• I am running Ubuntu Mate
• I am running Qt Creator 4.6.2
• I am running Qt 5.10.1

Again thanks in advance! : )

Also my .pro file.

TEMPLATE +=app
QT+= webkitwidgets
CONFIG += c++11

[VRonin]

webengine != webkit. the first is based on the core of Google Chrome while the other is based on the core of Apple's Safari

use QT += webenginewidgets

[Nite Coder]

Sorry, I did do that, I just wrote it down wrong. Its still is an error.

//My actual .pro file
TEMPLATE +=app
QT+= webenginewidgets
CONFIG+= c++11

[mpergand]

Try:
QT += widgets webenginewidgets

[Nite Coder]

It still won't work. Is it my version? Qt 5.10.1

[mpergand]

Look at the .pro file of the DemoBrowser in the Examples folder that come along with Qt.

[Nite Coder]

I did. That's what was in the .pro file.

//Simple Browser .pro File

TEMPLATE = app
TARGET = simplebrowser
QT += webenginewidgets
CONFIG += c++11

HEADERS += \
    browser.h \
    browserwindow.h \
    downloadmanagerwidget.h \
    downloadwidget.h \
    tabwidget.h \
    webpage.h \
    webpopupwindow.h \
    webview.h

SOURCES += \
    browser.cpp \
    browserwindow.cpp \
    downloadmanagerwidget.cpp \
    downloadwidget.cpp \
    main.cpp \
    tabwidget.cpp \
    webpage.cpp \
    webpopupwindow.cpp \
    webview.cpp

FORMS += \
    certificateerrordialog.ui \
    passworddialog.ui \
    downloadmanagerwidget.ui \
    downloadwidget.ui

RESOURCES += data/simplebrowser.qrc

# install
target.path = $$[QT_INSTALL_EXAMPLES]/webenginewidgets/simplebrowser
INSTALLS += target

[mrjj]

@Nite-Coder
Hi
Make sure to delete the build folder
and re-run qmake from build menu to make sure .pro file is 100% parsed again.

[Nite Coder]

What is the build folder? Sorry if I am asking a lot of, probably pointless, questions. But I appreciate the help.

[mrjj]

@Nite-Coder
All questions are fine.
The build folder is where it puts all generated files. all the .o files etc.
Its normally located on same level as the project folder.
and named something like
build-PROJECTNAME-Desktop_Qt_5_10_1_CompilerName-Debug

if you are using shadow build. you can see it in projects

If issue finding it then
Open project
Right click on any file in proejct
select Open containing folder
The file explorer should come.
Go one step up/ back
you should see folder. ( that is if u did build the project)

[Nite Coder]

Okay, I did that and it still didn't work. I deleted the build folder and re-built it.

[mrjj]

@Nite-Coder
ok so we know u 100% have
QT += webenginewidgets

I wonder if its installed ?
It has to be selected during install if not whole group was selected.
If you used the online installer, you can use
MaintenanceTool.exe in Qt folder.

[Nite Coder]

Okay, I have the Maintenance Tool. But it is a .dat file. Do I have to run a chmod command to get it running? And what would the chmod command be. Thanks for upvoting me mrjj!

[mrjj]

@Nite-Coder
Hmm. I just releasize you are on linux. :)
Did you use online installer or got Qt via distro ?

update:
should be something like

[Nite Coder]

I used the online installer after using the distro's repositories. Would that affect anything?
Edit: I got the .dat and .ini

[mrjj]

@Nite-Coder
So you dont have the ".exe" ?

[Nite Coder]

No I don't...

[mrjj]

@Nite-Coder
https://forum.qt.io/topic/80874/why-can-t-i-find-maintenance-tool-in-qt5-for-ubuntu-16-04-lts
Im not 100% sure but i think easy route to install extra Qt version from
online to get the tool. ( and install in local user folder, NOT system wide folder )
If wonder if we can just copy exe. but i fear .dat is not updated.

[Nite Coder]

@mrjj
What is the local user folder?
And...
So you want me to install Qt again with the online install

I just managed to copy the .dat file so I could rename it o .exe. It opened up an archive manager and displayed an error message saying it couldn't open the file as a PE archive

[mrjj]

@Nite-Coder
well just in our home folder.
Not in /opt or anywhere rest of system might look for so files etc.
(just to be safe. not sure it matters)

Well it seems to be suggested that.
Else wait a few hours and maybe someone know how to apt-get it directly or
something faster.
we could also just try to copy my version and see but im not sure it has its right ini file and dat file then.
maybe you can apt-get webengine directly, but im not sure under which name/deb file.

the .dat file is NOT the exe. :)

[Nite Coder]

Thanks for the help mrjj! I upvoted you on every post : ) (Thanks for the upvote!) I think I'll wait. The apt-get method seems to be the best idea. But I'll try installing it again.

[mrjj]

@Nite-Coder
I agree. Its pretty normal to use distro Qt and for say unity i think it was
also needed for integration. So i assume there is some other way.

[Nite Coder]

I just found the exe file! : ) lol

[mrjj]

@Nite-Coder
hehe :)
it was in other location ?
So hopefully now it works!

[Nite Coder]

No... It was in the same location... I missed it...

[Nite Coder]

It still doesn't work...
Though I updated to 5.11.1 and I checked it installed QWebEngine

[mrjj]

@Nite-Coder
Ok but to talk it over
You had the webengine in the list and it installed ?

Do you have the samples installed ?

[Nite Coder]

I do have the examples

[mrjj]

@Nite-Coder
They also complain about
QT += webenginewidgets
or do they compile and run ?

[Nite Coder]

They compile and run and I don't know why

[mrjj]

@Nite-Coder
well your project should too then. :)
try delete build folder again.
also any .user file to select the new Qt for the project.
It might remember the old version of Qt or have old files in build folder.

[Nite Coder]

Still doesn't work. I deleted the build folder and the .user file. Though... I might create a new project and try

[mrjj]

@Nite-Coder
Good plan.
Since the sample works, there are high hopes :)

[Nite Coder]

Those high hopes are now dashed... Though your upvote is appreciated : )

[Nite Coder]

Do you know if Chromium has to be installed? I know that it is based on Chromium

[mrjj]

@Nite-Coder
so new project didnt compile?
After adding
QT += webenginewidgets
did you run qmake from menu ?

[Nite Coder]

How do you qmake from the menu?

[mrjj]

Hi
Its in build menu

[Nite Coder]

It doesn't work still

[mrjj]

@Nite-Coder
Ok. very odd.
What about copy all the files from the
Minimal example folder to a new folder and try that ?