Qt for WebAssembly

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  SOLVED Qt Webasssembly - Pass URL parameter to QML
  • narayanan.krish  

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  This solution works fine for get parameter, I was wondering if this is possible for post too? Or is there another solution to this, so I don't have to show the parameter directly in the address ?
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  SOLVED Unable to run an example using MQTT
  • nsourl  

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  Hi @JKSH , Now it's clear enough what I have to do, then I will try to build the source code for Qt WebAssembly and generate the necessary set of libraries. I appreciate your help on this! Thanks.
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  UNSOLVED How to use SQLite in Qt WebAssembly
  • Kallappa  

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  @JonB I know Qtsql module not supported in Wasm. i believe wasm supports virtual file system and tried QFile read and write operation. why Qt still not support for SQL? even i need Sqlite should work on wasm. @lorn-potter can you please answer for this? thanks,
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  UNSOLVED QMQTT run error on Qt for WebAssembly?
  • tanthinh1510  

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  UNSOLVED Building Qt5.14.2 for WebAssembly shared returns error.
  webengine webassembly webengine qt5 wasm • • Oshio  

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  Hi @SGaist , One thing that made me skeptical about the info on the introduction page, was the affirmative that webassembly doesn't support threads, which is not an absolute true, in fact is relatively simple to enable thread support with the correct emscripten version. But everything so far is telling me that is not possible, or at least it will be very hard to compile wasm as shared.
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  UNSOLVED Webassembly linker errors
  • yalnte  

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  UNSOLVED Render HTML in Qt WebAssembly
  • chilarai  

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  SOLVED Webassembly issue Project ERROR: Unknown module(s) in QT: webengine
  • chilarai  

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  I found out that the QtWebEngine module is indeed not available and instead QtWebView is available. After replacing WebEngineView with WebView, the compiling error is gone and the program compiles. But yes QtWebview is unsupported as it is integrated with QtWebengineView
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  UNSOLVED Accessing files on the "server side"?
  • RogueWarrior  

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  @RogueWarrior no experience with webassembly, but by creating and running a Qt app on the embedded device, you could leverage access via any VNC client using the VNC platform plugin i.e. ./yourQtApp -platform vnc
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  SOLVED HelloWorld Wasm build problem
  • Amin Ya  

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  @Amin-Ya Would you please specify what exactly you are referring to when you are saying the C++ path? I seem to be having the same problem here.
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  UNSOLVED PROXY_TO_PTHREAD Support
  • Ahmed Yarub Hani Al Nuaimi  

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  @jsulm thank you for the answer. That might work indeed, but the thing is the same application works on Windows, iOS, Mac, Android, and Linux. I'd have to change the logic just to make it work with Wasm. I could easily run non-Qt application simply by proxifying the call to main, is there a way to get that to work with Qt5 apps?
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  SOLVED Http get request : no body in webassembly
  http wasm http get emscripten • • Mixlu  

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  @Ahmed-Yarub-Hani-Al-Nuaimi Oh ok I see, thanks for your time !
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  UNSOLVED play rtsp stream in WebAssembly
  • choujayylyxm  

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  UNSOLVED webassembly build fails
  • amphi  

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  @amphi u can try to put emscripten configuration file in home directory (~.emscripten) and Qt creator should be able to find emscripten automatically. But I did it on Win10, might be the same issue for ubuntu (https://forum.qt.io/topic/117580/build-simple-qml-on-webassembly )
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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 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 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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  This topic is deleted!
  • 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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  SOLVED [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
  webassembly examples 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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