Qt for WebAssembly

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  UNSOLVED Links for Qt for WebAssembly
  • lorn.potter  

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  @tansgumus said in Links for Qt for WebAssembly: Fireofox 76.0 (64-bit) Fireofox 76.0 (64-bit) nooooooooooooooooooo this very bad
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  SOLVED Build simple QML on WebAssembly
  • kirill_f  

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  @kirill_f Problem solved. I just installed upstream version of emscrypten instead of fastcomp. emsdk install sdk-upstream-1.39.8-64bit emsdk activate sdk-upstream-1.39.8-64bit
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  This topic is deleted!
  • kirill_f  

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  UNSOLVED webassembly build fails
  • amphi  

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  UNSOLVED Is the Qt WASM module linked into a project binary?
  • trinopoty  

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  UNSOLVED Qt Lottie on WebAssembly
  • MeSakone  

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  I am not even sure how supported QtLottie is on the desktop, but not yet supported for Qt WebAssermbly. I do know that the Qt WebAssembly platform has a few issues like this regarding QLogging and Q_DECLARE_LOGGING_CATEGORY that do not happen on desktop, as we are built statically linked.
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  UNSOLVED Export *.xlsx or *.ods in Qt WebAssembly
  • oria66  

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  There is file access, both locally and for the system. Since WebAssembly lives in the browsers javascript sandbox, to access file content on the system, outside of the browser, we created QFileDialog::getOpenFileContent and QFileDialog::saveFileContent https://doc.qt.io/qt-5/qfiledialog.html#getOpenFileContent Also, there should be persistent files, but it's a bit broken at the moment in all the releases.
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  UNSOLVED float unrepresentable in integer range
  • mikhail_kr  

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  What version of Qt and what version of Emscripten are you using?
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  SOLVED How to read QueryString params
  • QtPai  

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  Hi @lorn-potter . Sorry for my super late reply. Your message was spot on. Not only that but it helped me understand some stuff about wasm that I wasn't very clear about. I did some changes and I got my app up and running with no issues. This is awesome. I'm loving Qt more and more everyday. Thank you very much and warm regards!
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  UNSOLVED What do I need to do to get quick3d + wasm working?
  quick3d • • timday  

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  UNSOLVED No rule to make target .... libqtmain.a
  • fhryilmaz  

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  UNSOLVED Transfer timeout for GET requests is ignored, request gets canceled after 30s of data transfer
  • Alexanderr  

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  Thanks for the update. When can we expect this merged? Also why was QNetworkRequest::DefaultTransferTimeoutConstant used for default value? In the documentation https://doc.qt.io/qt-5/qnetworkrequest.html#setTransferTimeout if the function was never called the actual default value is stated to be 0 which is equal to no time limit. DefaultTransferTimeoutConstant is just used as default value if the function was called without any arguments.
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  SOLVED record audio in WebAssembly
  • Niushaa  

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  @lorn-potter Thank you.I use OpenAL and it works for me.
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  • Kallappa  

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  UNSOLVED Associate QT WebAssembly with emscripten
  • Clara_SA  

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  QtCreator does not have full support for using emscripten, unless you use Qt 5.15. Even then it is still experimental and you need to enable the WebAssembly plugin from within QtCreator first. It's just easier to build using the commandline.
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  UNSOLVED [WASM] Get full file path name from QFileDialog::getOpenFileContent
  webassembly file dialog emscripten • • Mixlu  

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  Short answer... you can't get the full file path of a file. Your question is more related to safety/security standards regarding major browsers and the decisions related to them made by owner companies/foundations. That is, javascript is not allowed to know the full path of a file shared by the user. So, fileContentReady or in general any webassembly function will end up being a javascript function, limited to the security standards imposed on js implementation by the browser. (You can always ask the user to install a java applet :P )
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  UNSOLVED Problem to run QT-Webassembly Examples
  examples webassembly building error • • davidMus  

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  @lorn-potter I have installed emsdk using ./emsdk install sdk-fastcomp-1.38.27-64bit ./emsdk activate sdk-fastcomp-1.38.27-64bit bcz installation fails(Error : No such tool/sdk) with ./emsdk install sdk-1.38.16-64bit and using online installer as well as offline static build am getting same error for simple Qt Application build error log kmb@ubuntu:~/Work/FEB2020/TestApp/build$ /home/kmb/Qt/5.14.0/wasm_32/bin/qmake .. Info: creating stash file /home/kmb/Work/FEB2020/TestApp/build/.qmake.stash kmb@ubuntu:~/Work/FEB2020/TestApp/build$ make em++ -c -pipe -O3 -std=gnu++11 -s ALLOW_MEMORY_GROWTH=1 -Wall -Wextra -DQT_DEPRECATED_WARNINGS -DQT_NO_DEBUG -DQT_QUICK_LIB -DQT_GUI_LIB -DQT_QMLMODELS_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -I../../TestApp -I. -I../../../../Qt/5.14.0/wasm_32/include -I../../../../Qt/5.14.0/wasm_32/include/QtQuick -I../../../../Qt/5.14.0/wasm_32/include/QtGui -I../../../../Qt/5.14.0/wasm_32/include/QtQmlModels -I../../../../Qt/5.14.0/wasm_32/include/QtQml -I../../../../Qt/5.14.0/wasm_32/include/QtNetwork -I../../../../Qt/5.14.0/wasm_32/include/QtCore -I. -I/home/kmb/.emscripten_ports/openssl/include -I../../../../Qt/5.14.0/wasm_32/mkspecs/wasm-emscripten -o main.o ../main.cpp em++ -c -pipe -O3 -std=gnu++11 -s ALLOW_MEMORY_GROWTH=1 -Wall -Wextra -DQT_DEPRECATED_WARNINGS -DQT_NO_DEBUG -DQT_QUICK_LIB -DQT_GUI_LIB -DQT_QMLMODELS_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -I../../TestApp -I. -I../../../../Qt/5.14.0/wasm_32/include -I../../../../Qt/5.14.0/wasm_32/include/QtQuick -I../../../../Qt/5.14.0/wasm_32/include/QtGui -I../../../../Qt/5.14.0/wasm_32/include/QtQmlModels -I../../../../Qt/5.14.0/wasm_32/include/QtQml -I../../../../Qt/5.14.0/wasm_32/include/QtNetwork -I../../../../Qt/5.14.0/wasm_32/include/QtCore -I. -I/home/kmb/.emscripten_ports/openssl/include -I../../../../Qt/5.14.0/wasm_32/mkspecs/wasm-emscripten -o testapp.js_plugin_import.o /home/kmb/Work/FEB2020/TestApp/build/testapp.js_plugin_import.cpp em++ -c -pipe -O3 -std=gnu++11 -s ALLOW_MEMORY_GROWTH=1 -Wall -Wextra -DQT_DEPRECATED_WARNINGS -DQT_NO_DEBUG -DQT_QUICK_LIB -DQT_GUI_LIB -DQT_QMLMODELS_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -I../../TestApp -I. -I../../../../Qt/5.14.0/wasm_32/include -I../../../../Qt/5.14.0/wasm_32/include/QtQuick -I../../../../Qt/5.14.0/wasm_32/include/QtGui -I../../../../Qt/5.14.0/wasm_32/include/QtQmlModels -I../../../../Qt/5.14.0/wasm_32/include/QtQml -I../../../../Qt/5.14.0/wasm_32/include/QtNetwork -I../../../../Qt/5.14.0/wasm_32/include/QtCore -I. -I/home/kmb/.emscripten_ports/openssl/include -I../../../../Qt/5.14.0/wasm_32/mkspecs/wasm-emscripten -o testapp.js_qml_plugin_import.o /home/kmb/Work/FEB2020/TestApp/build/testapp.js_qml_plugin_import.cpp /home/kmb/Qt/5.14.0/wasm_32/bin/rcc -name qml ../qml.qrc -o qrc_qml.cpp em++ -c -pipe -O3 -std=gnu++11 -s ALLOW_MEMORY_GROWTH=1 -Wall -Wextra -DQT_DEPRECATED_WARNINGS -DQT_NO_DEBUG -DQT_QUICK_LIB -DQT_GUI_LIB -DQT_QMLMODELS_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -I../../TestApp -I. -I../../../../Qt/5.14.0/wasm_32/include -I../../../../Qt/5.14.0/wasm_32/include/QtQuick -I../../../../Qt/5.14.0/wasm_32/include/QtGui -I../../../../Qt/5.14.0/wasm_32/include/QtQmlModels -I../../../../Qt/5.14.0/wasm_32/include/QtQml -I../../../../Qt/5.14.0/wasm_32/include/QtNetwork -I../../../../Qt/5.14.0/wasm_32/include/QtCore -I. -I/home/kmb/.emscripten_ports/openssl/include -I../../../../Qt/5.14.0/wasm_32/mkspecs/wasm-emscripten -o qrc_qml.o qrc_qml.cpp sed -e s/@APPNAME@/TestApp/g /home/kmb/Qt/5.14.0/wasm_32/plugins/platforms/wasm_shell.html > /home/kmb/Work/FEB2020/TestApp/build/TestApp.html cp -f /home/kmb/Qt/5.14.0/wasm_32/plugins/platforms/qtloader.js /home/kmb/Work/FEB2020/TestApp/build cp -f /home/kmb/Qt/5.14.0/wasm_32/plugins/platforms/qtlogo.svg /home/kmb/Work/FEB2020/TestApp/build em++ -s WASM=1 -s FULL_ES2=1 -s USE_WEBGL2=1 -s NO_EXIT_RUNTIME=0 -s ERROR_ON_UNDEFINED_SYMBOLS=1 --bind -O3 -s ALLOW_MEMORY_GROWTH=1 -o ./TestApp.js main.o testapp.js_plugin_import.o testapp.js_qml_plugin_import.o qrc_qml.o /home/kmb/Qt/5.14.0/wasm_32/plugins/platforms/libqwasm.a /home/kmb/Qt/5.14.0/wasm_32/lib/libQt5EventDispatcherSupport.a /home/kmb/Qt/5.14.0/wasm_32/lib/libQt5FontDatabaseSupport.a /home/kmb/Qt/5.14.0/wasm_32/lib/libqtfreetype.a /home/kmb/Qt/5.14.0/wasm_32/lib/libQt5EglSupport.a /home/kmb/Qt/5.14.0/wasm_32/plugins/imageformats/libqgif.a /home/kmb/Qt/5.14.0/wasm_32/plugins/imageformats/libqicns.a /home/kmb/Qt/5.14.0/wasm_32/plugins/imageformats/libqico.a /home/kmb/Qt/5.14.0/wasm_32/plugins/imageformats/libqjpeg.a /home/kmb/Qt/5.14.0/wasm_32/plugins/imageformats/libqtga.a /home/kmb/Qt/5.14.0/wasm_32/plugins/imageformats/libqtiff.a /home/kmb/Qt/5.14.0/wasm_32/plugins/imageformats/libqwbmp.a /home/kmb/Qt/5.14.0/wasm_32/plugins/imageformats/libqwebp.a /home/kmb/Qt/5.14.0/wasm_32/qml/QtQuick.2/libqtquick2plugin.a /home/kmb/Qt/5.14.0/wasm_32/qml/QtQuick/Window.2/libwindowplugin.a /home/kmb/Qt/5.14.0/wasm_32/lib/libQt5Quick.a /home/kmb/Qt/5.14.0/wasm_32/lib/libQt5QmlModels.a /home/kmb/Qt/5.14.0/wasm_32/lib/libQt5Qml.a /home/kmb/Qt/5.14.0/wasm_32/lib/libQt5Gui.a /home/kmb/Qt/5.14.0/wasm_32/lib/libqtlibpng.a /home/kmb/Qt/5.14.0/wasm_32/lib/libqtharfbuzz.a /home/kmb/Qt/5.14.0/wasm_32/lib/libQt5Network.a /home/kmb/Qt/5.14.0/wasm_32/lib/libQt5Core.a /home/kmb/Qt/5.14.0/wasm_32/lib/libqtpcre2.a shared:ERROR: '/home/kmb/Qtwasm/emsdk/fastcomp-clang/e1.38.27_64bit/binaryen/bin/asm2wasm ./TestApp.temp.asm.js --total-memory=16777216 --trap-mode=allow -O3 --mem-init=./TestApp.js.mem --mem-base=1024 --wasm-only -o ./TestApp.wasm --mvp-features' failed (-9) Makefile:215: recipe for target 'TestApp.js' failed make: *** [TestApp.js] Error 1 so what is cuase here and i am using Ubuntu 18.04 VM kindly let me root cause
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  UNSOLVED Build Error : Qt WebAssembly for Linux (Uubuntu 18.04)
  • Kallappa  

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  And one more problem is if one of the other basic Qt App gets compiled and build successfully and when i run it using *"emrun .html" using console i am getting application exit error as shown in image So what is the reason for getting this.(I am using Firefox browser).
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  UNSOLVED How to use qt webassembly in qml application?
  qt5.6 webassembly • • Niushaa  

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  @lorn-potter I have checked it in qt 5.15 with em 1.39.16. but still I have same problem.
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  UNSOLVED Build Postgresql driver for Webassembly
  • YasserFathy  

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  Thanks Jon, hope he sees it.
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  SOLVED Using qrc/qss files with Qt WASM
  • LorenzE  

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  Thanks! The following code, using QFile and a top level path, did indeed work: QFile file(":/dark.qss"); file.open(QFile::ReadOnly); QTextStream stream(&file); pApp->setStyleSheet(stream.readAll());
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  UNSOLVED Web assembly: Browser zoom in-out issue with Qt charts( Pie Chart).
  • ShantanuK  

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  UNSOLVED add static library
  • radu022003  

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  using the latest emscripten version 1.39.11 seems to work as expected
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  SOLVED Does Safari support Qt for WebAssembly?
  • SyntaX  

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  @lorn-potter ah good to know, thanks for the information :D
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  SOLVED Handle Platform specific imports
  • SyntaX  

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  Hey @lorn-potter and thanks for your reply and the provided information!
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  UNSOLVED Qt wabassembly cache
  webassembly qt5.14.2 • • Niushaa  

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  @lorn-potter you mean if I update part of my application I should download all application in my browser?
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  SOLVED WebAssembly 5.15 on Docker
  • guerinoni  

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  @guerinoni Thank you for sharing.
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  UNSOLVED WebAssembly for Qt Creator
  linux qt creator webassembly qt 5.15 emscripten • • tansgumus  

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  @Falko said in WebAssembly for Qt Creator: I started with 1.39.8, but Qt Creator was always complaining that I don't use 1.39.7. I updated Qt Creator to the recent version (Qt Creator 4.12.2) but still complains even when I tried to use Emscripten1.39.7!!!
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  UNSOLVED Where the examples?
  • Tony Pham  

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  UNSOLVED hosting qt web app
  • Developer01  

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  Any HTTP/HTTPS server will do. AWS, Apache, nginx, cutelyst, even simple Python/ Qt servers.
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  SOLVED WebAssembly Compiling error
  • MeSakone  

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  its work, thank you.
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  SOLVED where to download the QtWebassembly binaries?
  • LeonZJU  

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  It is. Thanks.
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  UNSOLVED Webassembly QtChart not refreshing
  • Mortimer  

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  Hi, I'm having what looks like your same issue: Widgets are not being repainted until I move the mouse. It is working well in Desktop just as in your case. Note this is not a QChart or the like, it its just a few QWidgets. Ive got a small QT WebAssembly application. (Qt 5.14.2 WebAssembly and emscripten 1.38.27-64bit). If any other one is seeing the issue and/or found out what to do about it please enlighten us :). Perhaps there is some js instruction to force the repainting or something like that. I am using a QStackedWidget; I suspect this might be an issue with this specific widget.
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  UNSOLVED QtQuickControls2 Examples of Qt WebAssembly won't work well
  • LeonZJU  

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  UNSOLVED WebAssembly: Https request with custom certificate
  ssl https webassembly certificate • • Mixlu  

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  Well WebAssembly is pretty strict, if you want to make https requests you need to use a proxy/bridge program that translates from websockets to http, it's installed on a PC on the same LAN as the WebAssembly PC (or on the same PC). For example you could use this one: https://github.com/novnc/websockify
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  SOLVED Missing QtQuick.Controls.Styles in WebAssembly
  • Dr.Stealth  

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  I found a solution for this problem. The import in the QML file has to look like: import QtQuick 2.0 import QtQuick.Controls 1.4 import QtQuick.Controls.Styles 1.4 My mistake was to import the QtQuick.Controls 2.x I also had to delete the build folder and build it from scratch.
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  UNSOLVED Web app crashed with WebGL: CONTEXT_LOST_WEBGL error
  • oria66  

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  I found this post. It's related I think. But now, How I wake up the context in Qt.html ? https://www.khronos.org/webgl/wiki/HandlingContextLost
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  UNSOLVED blank web page
  • Developer01  

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  SOLVED Test if WebAssembly in C++ code
  • Mixlu  

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  Hi, Even simpler use Qt's OS defines: Q_OS_WASM: #ifdef Q_OS_WASM // You WASM specific code #endif
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  SOLVED HelloWorld Wasm build problem
  • Amin Ya  

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  I solved the problem, and the error is gone now. I had named one of my folders in the path C++ which caused all of these issues. This was mentioned by one of the people in the Slack group: The following error message (and the fact that you get two of them) suggests a problem with the copy command, For example, spaces in the paths which are not properly escaped or quoted. The syntax of the command is incorrect.