Cannot open include file: 'QPrintPreviewWidget': No such file or directory

[schlenger]

It seems like the import changed with the newer Qt versions: When embedding the library, the error from above is shown. Changing the import to #include <QtPrintSupport/QPrintPreviewWidget> worked for me, but I don't know if it's the best solution.

E.g. this change solved my issue: master...schlenger:qt_print_support_fix

[jkriege2]

Hi!

which build-environment do you use? (Qt-Version, Compiler, OS, QMake/CMake)? ... Since I didn't see that problem until now ... I teste with up to Qt 5.15.

Note that Qt6 is not (yet?) supported!

Best,
JAN

[jkriege2]

I poked around a bit on the internet:

• Some people sporadically have suc problems, but they are mostly due to problems in te build system
• Qt's official recommendation for Qt 5.15 ist simply #include: https://doc.qt.io/Qt-5/qprintpreviewwidget.html

So could you let me know some more details about your build system?

[schlenger]

Hi,

@jkriege2 thanks you for your answer. I tried the official Qt recommendation before I opened this ticket, but, it didn't worked out for me.

I'm currently building on Windows with the default Qt installation, version notes:

Qt Creator 4.13.0
Based on Qt 5.15.0 (MSVC 2019, 64 bit)

Built on Aug 25 2020 10:06:59

on

Windows 10 Pro
Version	10.0.18362 Build 18362

If this only affects me, you can also close the issue. I thought maybe someone else is experiencing the same issues.

Side note: Thank you for your awesome work, the plotter with all the examples is a really neat piece of work!

[jkriege2]

Hi!

could you try and add these two lines to lib\jkqtplotter\CMakeLists.txt

get_target_property(printsupp_inc Qt5::PrintSupport INTERFACE_INCLUDE_DIRECTORIES)
message("Qt5::PrintSupport::INTERFACE_INCLUDE_DIRECTORIES = ${printsupp_inc}")

... and check the output? I did a quick test with Qt 5.14, MSVC2017-64bit ... and for me it reads

Qt5::PrintSupport::INTERFACE_INCLUDE_DIRECTORIES = C:/development/Qt/5.13.2/msvc2017_64/include/;C:/development/Qt/5.13.2/msvc2017_64/include/QtPrintSupport

which should allow for writing #include

... or do you use QMake for building?

[jkriege2]

Hmmm ... I also checked with Qt 5.15.0/MSVC2019 ... and for me it works. Could you try my suggestion from above?

[jkriege2]

should be fixed via cc6a87c