Show pdf files on embedded Linux

[Nekk]

Hi all.

I'm developing a Qt application for embedded Linux (built using the Yocto Project resources). The Qt version is 5.11.2. I need to show pdf documents. I read something on internet. If I well understand, the Qt packages/plugins/library that can allow to do what I need are qtwebengine, qtwebkit, poppler, evince, pdf.js but I don't know how to use them . In my Linux image are currently installed the following packages/plugins:

qtwebengine cortexa7t2hf-neon-vfpv4 5.11.3+git0+18412af977_2095a35f30-r0.0
qtwebengine-plugins cortexa7t2hf-neon-vfpv4 5.11.3+git0+18412af977_2095a35f30-r0.0
qtwebengine-qmlplugins cortexa7t2hf-neon-vfpv4 5.11.3+git0+18412af977_2095a35f30-r0.0

qtwebkit cortexa7t2hf-neon-vfpv4 5.11.3+git0+beaeeb9988-r0.2
qtwebkit-dev cortexa7t2hf-neon-vfpv4 5.11.3+git0+beaeeb9988-r0.2
qtwebkit-mkspecs cortexa7t2hf-neon-vfpv4 5.11.3+git0+beaeeb9988-r0.2
qtwebkit-plugins cortexa7t2hf-neon-vfpv4 5.11.3+git0+beaeeb9988-r0.2
qtwebkit-qmlplugins cortexa7t2hf-neon-vfpv4 5.11.3+git0+beaeeb9988-r0.2

poppler-data all 0.4.9-r0.0
libpoppler-glib8 cortexa7t2hf-neon-vfpv4 0.70.1-r0.0
libpoppler81 cortexa7t2hf-neon-vfpv4 0.70.1-r0.0

evince cortexa7t2hf-neon-vfpv4 3.28.2-r0.0
evince-locale-en-gb cortexa7t2hf-neon-vfpv4 3.28.2-r0.0

I'm not an expert Qt/Linux/Yocto programmer. Can someone tell me how to proceed?

Many thanks
Regards

[JoeCFD]

@Nekk https://doc.qt.io/qt-5/qtpdf-pdfviewer-example.html

[Nekk]

@JoeCFD ,

Hi JoeCFD.
The link you give me is for QT 5.15. I work with an embedded QT 5.11.2 version. Do you think it would be good for my case? Honestly, I don't know how to use it. In my project I don't use ".ui" files.
Thanks

[JoeCFD]

@Nekk
qpdf is available since 5.10.
https://doc.qt.io/qt-5/qpdfdocument.html

ui file will be converted to C++ code in the build. You do not need ui file to make Qt GUI app. I do not use it either.

[Nekk]

@JoeCFD

Based on the example you indicated me, I tried to add the mainwindow, pageselector, zoomselector files (cpp and header) in my project. I modified the ".pro" file adding "QT += pdfwdgets" but the build process return the error

"Unknown module(s) in QT: pdfwidgets"

This is my".pro" file

QT += serialbus qml quick quickcontrols2 sql charts widgets pdfwidgets
QT += opengl


DEFINES += QT_DEPRECATED_WARNINGS
DEFINES += QT_USE_FAST_OPERATOR_PLUS
DEFINES += QT_USE_FAST_CONCATENATION

CONFIG += c++11
CONFIG += disable-desktop
CONFIG += link_pkgconfig
CONFIG += lang-all


static {
    QT += svg
    QTPLUGIN += qtvirtualkeyboardplugin
}

QTPLUGIN += QMYSQL

QT += quick multimedia
PKGCONFIG += gstreamer-1.0 glib-2.0 gobject-2.0 gstreamer-app-1.0 gstreamer-pbutils-1.0

QT += printsupport


SOURCES += \
    canBus.cpp \
    dbManagement.cpp \
    main.cpp \
    myUtility.cpp \
    stateMachine.cpp \
    mainwindow.cpp \
    pageselector.cpp \
    zoomselector.cpp

RESOURCES += \
    resources.qrc \
    qml.qrc


TARGET = MYAPP


qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target


disable-xcb {
    message("The disable-xcb option has been deprecated. Please use disable-desktop instead.")
    CONFIG += disable-desktop
}



HEADERS += \
    Data.h \
    canBus.h \
    dbManagement.h \
    myTimer.h \
    myUtility.h \
    stateMachine.h \
    myProcess.h \
    mainwindow.h \
    pageselector.h \
    zoomselector.h

OTHER_FILES  += \
    notes.txt    \
    other_file1.txt \
    other_file2.txt

Thanks

[JoeCFD]

@Nekk I guess you did not install the module.
Check it out with command:
locate libQt5PdfWidgets.so

you can install them
sudo apt-get install libqt5pdfwidgets5 libqt5pdf5 in Debian Linux

[Nekk]

@JoeCFD I have an embedded Yocto Linux operative system. I can't use the commands you suggested me

[JoeCFD]

@Nekk Then use what you have to install them. You have installed other Qt modules. You can do the same thing.

[Nekk]

@JoeCFD I didn't install the other Qt modules (the project was passed to me) and I wouldn't know how to do it. Can anyone give me guidance on this? Thanks