@JonB

Well not against offering you a beer, or two...(or more :-))

@JonB said in undefined reference - Help first time external header library QT C++ [Linux]:

At this point have you considered dropping this third-party Borland stuff completely and using Qt's QTcpSocket to do whatever you want from TCP instead? But I'm not offering to change your own source code over from using Borland TCP to Qt's ;-)

This APi is used for GPIO manipulation from an ethernet GPIO modules :
787d599f-c9e0-4a81-b147-61a7492b4eee-image.png

What you say seems really true, cause the documentation about the use with Visual studio c++ do not refer at any moment about any library, only cpp/h files. I will try to use this documentation and use into my *.pro file only the files used into Visual Studio.

https://www.deditec.de/media/pdf/manual_e_delib.pdf#page=26&zoom=auto,-329,815

I will made you a feedback of course

@mpergand thank you but:

I stated previously that I work with PDFium this time, as Poppler doesn't offer edits; I managed to work around without using static method: maybe not the nicest solution around but works.

At any rate I made a note of your comment in case I need to revisit this godawful file format known as PDF in the future.

I finally found the problème from qt documentation.
My solution is to add : QTQUICK_COMPILER_SKIPPED_RESOURCES += testgooglemapwebengine.qrc in my .pro file.

Hi @UnitScan,

so please mark this topic as SOLVED too. Thanks!

Hi @neovius and Welcome,

When i change the backlight slider, the signal is emitted, and received. but i still get the warning when starting the application :

That is because you are creating QML component before setting the context property and thus naturally it wont be able to access that method at very first time.

http://doc.qt.io/qt-5/qtqml-cppintegration-exposecppattributes.html#exposing-properties
http://doc.qt.io/qt-5/qtqml-cppintegration-exposecppattributes.html#exposing-methods-including-qt-slots