QtPDF not availabel on mac?

JoeCFD

Use free poppler for pdf( under GPLv2 or GPLv3) . It is not hard to add it.
Qt uses PDFium. https://wiki.qt.io/Handling_PDF
Poppler seems even better than PDFium
https://hub.alfresco.com/t5/alfresco-content-services-blog/pdf-rendering-engine-performance-and-fidelity-comparison/ba-p/287618

JoeCFD

Qt PDF is available under both GPLv3 and LGPLv3.
https://marketplace.qt.io/products/qtpdf

JoeCFD

can you run the example?
qt-examples/Qt-5.15.2/pdf/pdfviewer

no problem to run it on Ubuntu.

zhenghan

@JoeCFD Thanks for your reply. I can't run the example with error "Unknown modules in Qt: pdf". It is wired why Qt can't find the module, because the Qt5Pdf.dll is in msvc2019_64/bin directory, and Qt5Pdf.lib in msvc2019_64/lib directory. But in msvc2019_64/include directory there is no subfolder named Qt5Pdf.

JoeCFD

You have to install this component
https://wiki.qt.io/QtPDF_Build_Instructions

zhenghan

@JoeCFD said in QtPDF not availabel on mac?:

https://wiki.qt.io/QtPDF_Build_Instructions

Thanks for your reply. I have complied this component. And it works.

zhenghan

@JoeCFD I want develop a pdf application in which I want to edit the pdf file, adding a digit signature in the pdf. What pdf library do you think is proper for the purpose?
I have find PoDoFo, and poppler, QtPdf(seems can't modify pdf). Again thanks for your time.

JoeCFD

MuPDF is the best. PDFium(Qt) is second. XPDF(Poppler) is third. You choose the better one for your app. You need to pay attention to license issue.

artwaw

@zhenghan Hi, sorry for late reply - I just built it from source, signed and installed. Like you did, from what I see.

DerReisende

I am successfully using PoDoFo from vcpkg for manipulating PDF (merging files, adding text content ,etc) files in my Qt 6.1 cmake project. Adding digital signatures with it should be possible ( I have read some code for it in the library but I don't have a use-case currently).
Be sure to install the [fontconfig] version of podofo otherwise you will get unexpected crashes on windows when drawing text with fonts.
Coding with it is quite straightforward although the documentation could be better - but I am no fluent c++ coder.

zhenghan

@JoeCFD Thanks for your advice. Very appreciate.

zhenghan

@artwaw Thank you.

zhenghan

@DerReisende Thank you. I will try it.