QtPDF not availabel on mac?
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wrote on 2 Jun 2020, 06:10 last edited by
@artwaw said in QtPDF not availabel on mac?:
I checked that QtCharts are now also a pricey addon
As far as I remember QtCharts has always been an add-on (or GPL). You really have to be careful with licenses. For commercial software you can use the LGPL-part of Qt. If you are using GPL-modules all your software needs to be under the GPL (meaning everyone who gets your software has also a right to get your source code). So, as long as your software is not GPL you cannot use either QtCharts or QtPDF. (Unless you pay for the commercial license.)
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@artwaw said in QtPDF not availabel on mac?:
I checked that QtCharts are now also a pricey addon
As far as I remember QtCharts has always been an add-on (or GPL). You really have to be careful with licenses. For commercial software you can use the LGPL-part of Qt. If you are using GPL-modules all your software needs to be under the GPL (meaning everyone who gets your software has also a right to get your source code). So, as long as your software is not GPL you cannot use either QtCharts or QtPDF. (Unless you pay for the commercial license.)
wrote on 2 Jun 2020, 11:24 last edited by@SimonSchroeder Thank you, I am aware of that.
My point is - assuming I am GPL user, which I am indeed - why is QtPDF not visible on Mac while QtCharts is? -
wrote on 2 Jun 2020, 18:11 last edited by
So according to all the sources I could find QtPDF is commercial OR GPL. So it should work yet my installation can't find it. I am puzzled now.
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wrote on 3 Jun 2020, 03:34 last edited by
I haven't found that module in Windows, either.
Maybe it is not released in the installer since it is still in technology preview? -
wrote on 3 Jun 2020, 06:21 last edited by
After a quick search I've found that indeed it might still be in Tech Preview. Most notably I have found that for now it seems to be part of QtWebEngine. As far as I remember QtWebEngine needs to be installed separately when using the online installer.
I have also found build instruction for QtPDF: https://wiki.qt.io/QtPDF_Build_Instructions
Maybe this helps if it is not yet included in any installers. -
After a quick search I've found that indeed it might still be in Tech Preview. Most notably I have found that for now it seems to be part of QtWebEngine. As far as I remember QtWebEngine needs to be installed separately when using the online installer.
I have also found build instruction for QtPDF: https://wiki.qt.io/QtPDF_Build_Instructions
Maybe this helps if it is not yet included in any installers.wrote on 3 Jun 2020, 20:26 last edited by@SimonSchroeder QtPDF is included in stable 5.15.0 as a part of the QtWebEngine. I have that installed and as I wrote the .framework files are present on the disk. That's the whole reason for this post, files are there, Qt doesn't seem to "see" them.
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@SimonSchroeder QtPDF is included in stable 5.15.0 as a part of the QtWebEngine. I have that installed and as I wrote the .framework files are present on the disk. That's the whole reason for this post, files are there, Qt doesn't seem to "see" them.
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wrote on 14 May 2021, 18:16 last edited by 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 -
wrote on 14 May 2021, 18:33 last edited by JoeCFD
Qt PDF is available under both GPLv3 and LGPLv3.
https://marketplace.qt.io/products/qtpdf -
wrote on 14 May 2021, 20:10 last edited by
can you run the example?
qt-examples/Qt-5.15.2/pdf/pdfviewerno problem to run it on Ubuntu.
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can you run the example?
qt-examples/Qt-5.15.2/pdf/pdfviewerno problem to run it on Ubuntu.
wrote on 15 May 2021, 03:40 last edited by@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.
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wrote on 16 May 2021, 16:55 last edited by
You have to install this component
https://wiki.qt.io/QtPDF_Build_Instructions -
You have to install this component
https://wiki.qt.io/QtPDF_Build_Instructionswrote on 17 May 2021, 03:32 last edited by@JoeCFD said in QtPDF not availabel on mac?:
Thanks for your reply. I have complied this component. And it works.
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You have to install this component
https://wiki.qt.io/QtPDF_Build_Instructionswrote on 17 May 2021, 05:43 last edited by@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. -
wrote on 17 May 2021, 13:29 last edited by 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.
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@artwaw Hi, sir. I have met the same problem. Did you solve it yet? I use qtcreator on windows, and I have a Qt5Pdf.dll in my bin directory. But when I use QT += pdf, I got the same error, Unknown modules in QT: pdf.
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wrote on 17 May 2021, 13:48 last edited by
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. -
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.
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@zhenghan Hi, sorry for late reply - I just built it from source, signed and installed. Like you did, from what I see.
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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.wrote on 18 May 2021, 03:14 last edited by@DerReisende Thank you. I will try it.