Qt for WebAssembly

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  UNSOLVED Links for Qt for WebAssembly
  • lorn.potter  

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  https://slackin.qtmob.org/ is a dead link now.
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  UNSOLVED Building Qt Apps to Wasm
  • DragonOsman  

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  @steno said in Building Qt Apps to Wasm: What was your solution for machine type must be wasm32? I have been seeing this as well. If you use the prebuilt binaries, you need to use emscripten version 1.38.27 or 1.38.30 for threaded. ./emsdk install sdk-fastcomp-1.38.27-64bit ./emsdk activate sdk-fastcomp-1.38.27-64bit
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  UNSOLVED QT WebAssembly for 32bit programs
  • codingchef  

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  It depends entirely on what your application actually does, as there are quite a few features present in the desktop and embedded platforms that will not work on WebAssembly platform. There are plenty of example apps: https://www.qt.io/qt-examples-for-webassembly https://s3.eu-west-2.amazonaws.com/wasm-qt-examples/last/index.html
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  UNSOLVED Setting up WebAssembly 5.14.0 ( Qt Maintenance Tool ) with QBS+QtCreator
  • FrogCastOrg  

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  For those wondering, I got it set up like this: You have to manually copy the environment variables set when you run source ./emsdk_env.sh in the shell. I did not know that source was a shell builtin
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  UNSOLVED QML Form in WebAssembly App?
  • DragonOsman  

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  For seeing how to make a form in QML, would looking at the QML XMLHttpRequest app (the example in the C:\Qt\Examples\Qt-5.14.0\qml\xmlhttprequest directory) help me?
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  UNSOLVED Qt for WebAssembly binaries for Mac OS
  • Javier Blasco  

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  You need to explicitly enable the webassembly plugin. From the menu: QtCreator->About plugins->Device Support->WebAssembly (experimental) Depending on your version of emscripten that you installed, it may or may not successfully detect the emscripten compiler.
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  UNSOLVED QtWebAssembly is not refreshing
  • rahuman  

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  UNSOLVED Add qml plugins in wasm
  • Hasardel  

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  Success :) To remove clipboard error, i disabled clipboard in source code : void QWasmClipboard::initClipboardEvents() { if (!hasClipboardApi) return; /*val permissions = val::global("navigator")["permissions"]; val readPermissionsMap = val::object(); readPermissionsMap.set("name", val("clipboard-read")); permissions.call<val>("query", readPermissionsMap); val writePermissionsMap = val::object(); writePermissionsMap.set("name", val("clipboard-write")); permissions.call<val>("query", writePermissionsMap);*/ hasClipboardApi = false; } Clipboard permission is not managed on my firefox (63.0.3 64bit). And to the blank page, i used QQuickView with resizeMode at SizeRootObjectToView : QQuickView* view = new QQuickView(); view->setResizeMode(QQuickView::SizeRootObjectToView); view->setSource(QUrl(QStringLiteral("qrc:///main.qml"))); view->show();
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  UNSOLVED Different types of errors on different browsers
  • Boris613  

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  SOLVED Qt 5.13.2 and recommended emscripten
  • Boris613  

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  Thanks Lorn. It was easier to rebuild Qt at the end, and it solved the issue.
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  UNSOLVED Problem running configure for wasm on Windows
  • GaryT  

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  Here is my path statement. There is a lot you probably don't care about but I included it all. I downloaded and installed the latest including the MSYS utilities. Sorry, I am not familiar with the MinGW toolset. It's a little unclear to me what version the Mingw is as different parts seem to have separate versions. Thanks for your help. Gary C:\emsdk;C:\emsdk\fastcomp\emscripten; C:\emsdk\python\2.7.13.1_64bit\python-2.7.13.amd64; C:\emsdk\java\8.152_64bit\bin; C:\emsdk\node\8.9.1_64bit\bin; C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\iCLS; C:\Program Files\Intel\Intel(R) Management Engine Components\iCLS; C:\Program Files (x86)\Windows Resource Kits\Tools; C:\Perl64\site\bin;C:\Perl64\bin; %SystemRoot%\system32; %SystemRoot%; %SystemRoot%\System32\Wbem; %SYSTEMROOT%\System32\WindowsPowerShell\v1.0; C:\Program Files\Microsoft SQL Server\120\Tools\Binn; C:\Program Files\Microsoft\Web Platform Installer; C:\Program Files\Microsoft SQL Server\130\Tools\Binn; C:\Program Files (x86)\Calibre2;C:\Program Files\PuTTY; C:\Program Files (x86)\WiX Toolset v3.11; C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL; C:\Program Files\Intel\Intel(R) Management Engine Components\DAL; C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT; C:\Program Files\Intel\Intel(R) Management Engine Components\IPT; %SYSTEMROOT%\System32\OpenSSH; C:\Program Files (x86)\IncrediBuild; C:\Program Files\Git\cmd; C:\Program Files\Intel\WiFi\bin; C:\Program Files\Common Files\Intel\WirelessCommon; C:\MinGW\bin; C:\Program Files (x86)\GnuWin32\bin;
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  UNSOLVED Run webassembly app without server
  • tham  

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  It needs to be served from a server. Luckily, there is a development tool in emscripten called emrun that you can use to serve the html file that gets generated when building.
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  UNSOLVED Force browser to clear the cache after wasm file updated
  • tham  

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  @tham your browser has a variety of option for you to do so. For chrome you could do one of the following: CTRL-Shift-R Use incognito mode Use the dev settings to disable it- Use Chrome profiles to create a profile with all caching disabled I don't know if there's a command or something the server could send to your browser to force a complete reload.
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  UNSOLVED Android chrome black screen
  • rejuce  

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  You can attach remote debugging and get some console output, which may help. You might need to enable webassembly from chrome://flags
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  UNSOLVED Using QThread in a webassembly app with latest upstream
  • DamienL  

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  Ok, so I updated my OS, and rebuilt my sources using the configure options : ./configure -xplatform wasm-emscripten -nomake examples -prefix $PWD/qtbase -no-warnings-are-errors -device-option WASM_OBJECT_FILES=1 -feature-thread And building my sources with the command: gmake -j4 module-qtbase module-qtdeclarative module-qtquickcontrols2 module-qtwebsockets module-qtsvg module-qtcharts module-qtmqtt module-qtdatavisualization It all compiles pretty well. But know when I try to compile a thread example (Mandelbrot for example) the building gives my this: Qt/5.13.1/Src/qtbase/plugins/imageformats/libqwebp.a /Users/macbook/Qt/5.13.1/Src/qtbase/lib/libQt5Widgets.a /Users/macbook/Qt/5.13.1/Src/qtbase/lib/libQt5Gui.a /Users/macbook/Qt/5.13.1/Src/qtbase/lib/libqtlibpng.a /Users/macbook/Qt/5.13.1/Src/qtbase/lib/libqtharfbuzz.a /Users/macbook/Qt/5.13.1/Src/qtbase/lib/libQt5Core.a /Users/macbook/Qt/5.13.1/Src/qtbase/lib/libqtpcre2.a wasm-ld: error: 'atomics' feature is disallowed by main_7512882a.o, so --shared-memory must not be used wasm-ld: error: Target feature 'atomics' used in main.o is disallowed by main_7512882a.o. Use --no-check-features to suppress. wasm-ld: error: Target feature 'atomics' used in mandelbrotwidget.o is disallowed by main_7512882a.o. Use --no-check-features to suppress. wasm-ld: error: Target feature 'atomics' used in renderthread.o is disallowed by main_7512882a.o. Use --no-check-features to suppress. wasm-ld: error: Target feature 'atomics' used in mandelbrot.js_plugin_import.o is disallowed by main_7512882a.o. Use --no-check-features to suppress. wasm-ld: error: Target feature 'atomics' used in moc_mandelbrotwidget.o is disallowed by main_7512882a.o. Use --no-check-features to suppress. wasm-ld: error: Target feature 'atomics' used in moc_renderthread.o is disallowed by main_7512882a.o. Use --no-check-features to suppress. wasm-ld: error: Target feature 'atomics' used in main_ad242c24.o is disallowed by main_7512882a.o. Use --no-check-features to suppress. wasm-ld: error: Target feature 'atomics' used in qwasmintegration_b84335f2.o is disallowed by main_7512882a.o. Use --no-check-features to suppress. wasm-ld: error: Target feature 'atomics' used in qwasmwindow_9693253c.o is disallowed by main_7512882a.o. Use --no-check-features to suppress. wasm-ld: error: Target feature 'atomics' used in qwasmscreen_5d172ee8.o is disallowed by main_7512882a.o. Use --no-check-features to suppress. wasm-ld: error: Target feature 'atomics' used in qwasmfontdatabase_96baba53.o is disallowed by main_7512882a.o. Use --no-check-features to suppress. wasm-ld: error: Target feature 'atomics' used in qwasmeventtranslator_b3a8cbb6.o is disallowed by main_7512882a.o. Use --no-check-features to suppress. wasm-ld: error: Target feature 'atomics' used in qwasmeventdispatcher_d440ff3d.o is disallowed by main_7512882a.o. Use --no-check-features to suppress. wasm-ld: error: Target feature 'atomics' used in qwasmcompositor_943e9174.o is disallowed by main_7512882a.o. Use --no-check-features to suppress. wasm-ld: error: Target feature 'atomics' used in qwasmcursor_54ea64f6.o is disallowed by main_7512882a.o. Use --no-check-features to suppress. wasm-ld: error: Target feature 'atomics' used in qwasmopenglcontext_242faabc.o is disallowed by main_7512882a.o. Use --no-check-features to suppress. wasm-ld: error: Target feature 'atomics' used in qwasmtheme_592c2dd9.o is disallowed by main_7512882a.o. Use --no-check-features to suppress. wasm-ld: error: Target feature 'atomics' used in qwasmclipboard_11896fc1.o is disallowed by main_7512882a.o. Use --no-check-features to suppress. wasm-ld: error: Target feature 'atomics' used in qwasmservices_bcfe057a.o is disallowed by main_7512882a.o. Use --no-check-features to suppress. wasm-ld: error: too many errors emitted, stopping now (use -error-limit=0 to see all errors) shared:ERROR: '/Users/macbook/emsdks/emsdk/upstream/bin/wasm-ld -o /var/folders/l_/53ppf0452z7bcrt24txtwfq00000gn/T/emscripten_temp_chKBFJ/mandelbrot.wasm --allow-undefined --lto-O0 /Users/macbook/Qt/5.13.1/Src/qtbase/lib/libqtfreetype.a /Users/macbook/Qt/5.13.1/Src/qtbase/lib/libqtlibpng.a -L/Users/macbook/emsdks/emsdk/upstream/emscripten/system/local/lib main.o -L/Users/macbook/emsdks/emsdk/upstream/emscripten/system/lib mandelbrotwidget.o -L/Users/macbook/.emscripten_cache/wasm-obj renderthread.o mandelbrot.js_plugin_import.o moc_mandelbrotwidget.o moc_renderthread.o /Users/macbook/Qt/5.13.1/Src/qtbase/plugins/platforms/libqwasm.a /Users/macbook/Qt/5.13.1/Src/qtbase/lib/libQt5EventDispatcherSupport.a /Users/macbook/Qt/5.13.1/Src/qtbase/lib/libQt5FontDatabaseSupport.a /Users/macbook/Qt/5.13.1/Src/qtbase/lib/libqtfreetype.a /Users/macbook/Qt/5.13.1/Src/qtbase/lib/libQt5EglSupport.a /Users/macbook/Qt/5.13.1/Src/qtbase/plugins/imageformats/libqgif.a /Users/macbook/Qt/5.13.1/Src/qtbase/plugins/imageformats/libqicns.a /Users/macbook/Qt/5.13.1/Src/qtbase/plugins/imageformats/libqico.a /Users/macbook/Qt/5.13.1/Src/qtbase/plugins/imageformats/libqjpeg.a /Users/macbook/Qt/5.13.1/Src/qtbase/plugins/imageformats/libqtga.a /Users/macbook/Qt/5.13.1/Src/qtbase/plugins/imageformats/libqtiff.a /Users/macbook/Qt/5.13.1/Src/qtbase/plugins/imageformats/libqwbmp.a /Users/macbook/Qt/5.13.1/Src/qtbase/plugins/imageformats/libqwebp.a /Users/macbook/Qt/5.13.1/Src/qtbase/lib/libQt5Widgets.a /Users/macbook/Qt/5.13.1/Src/qtbase/lib/libQt5Gui.a /Users/macbook/Qt/5.13.1/Src/qtbase/lib/libqtlibpng.a /Users/macbook/Qt/5.13.1/Src/qtbase/lib/libqtharfbuzz.a /Users/macbook/Qt/5.13.1/Src/qtbase/lib/libQt5Core.a /Users/macbook/Qt/5.13.1/Src/qtbase/lib/libqtpcre2.a /Users/macbook/.emscripten_cache/wasm-obj/libc-mt.a /Users/macbook/.emscripten_cache/wasm-obj/libcompiler_rt.a /Users/macbook/.emscripten_cache/wasm-obj/libc-wasm.a /Users/macbook/.emscripten_cache/wasm-obj/libc++-mt-noexcept.a /Users/macbook/.emscripten_cache/wasm-obj/libc++abi-mt-noexcept.a --whole-archive /Users/macbook/.emscripten_cache/wasm-obj/libembind-rtti.a --no-whole-archive /Users/macbook/.emscripten_cache/wasm-obj/libgl-mt-webgl2.a /Users/macbook/.emscripten_cache/wasm-obj/libdlmalloc-mt.a /Users/macbook/.emscripten_cache/wasm-obj/libpthread-mt.a /Users/macbook/.emscripten_cache/wasm-obj/libc_rt_wasm.a --import-memory --import-table --shared-memory -mllvm -combiner-global-alias-analysis=false -mllvm -enable-emscripten-sjlj -mllvm -disable-lsr --export __wasm_call_ctors --export __data_end --export main --export malloc --export free --export setThrew --export __errno_location --export fflush --export emscripten_get_global_libc --export __pthread_tsd_run_dtors --export _register_pthread_ptr --export pthread_self --export __emscripten_pthread_data_constructor --export emscripten_futex_wake --export memalign --export emscripten_builtin_memalign --export realloc --export emscripten_builtin_free --export _get_environ --export _ZSt18uncaught_exceptionv --export emscripten_GetProcAddress --export emscripten_webgl_make_context_current --export emscripten_webgl_get_current_context --export strstr --export _get_tzname --export _get_daylight --export _get_timezone --export strlen -z stack-size=5242880 --initial-memory=1073741824 --no-entry --max-memory=1073741824 --global-base=1024' failed (1) gmake: *** [Makefile:320: mandelbrot.js] Error 1 10:58:20: The process "/usr/local/bin/gmake" exited with code 2. Error while building/deploying project mandelbrot (kit: Qt 5.13.1 (Src)) When executing step "Make" 10:58:20: Elapsed time: 00:58. And I have no clue what it means. Thanks.
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  UNSOLVED Cannot enter non ascii characters to the TextField and QLineEdit from browser(wasm)
  • tham  

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  Do anyone know workarounds to avoid this bug?Thanks
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  SOLVED Empty quick app consumes cpu on doing nothing (multithreaded Qt build)
  • MS_36  

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  Okay, thanks! I would prefer it to use less CPU in that case so I will open a bug after I tried it without multithreading. Edit: Single threaded its fine (QTBUG-79953)
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  SOLVED Trying to Configure Qt for Windows Desktop after Building for Wasm
  • DragonOsman  

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  I was able to configure an out-of-source build, passing win32-msvc2019 as the argument for -platform, I got the output shown in this Gist: https://gist.github.com/DragonOsman/3c198095a61a7c38e2b019d3a964d416 . Notice the errors. I configured with this command: C:/qt5/configure -static -release -opensource -feature-thread -qt-zlib -qt-libjpeg -qt-libpng -platform win32-msvc2019 -prefix C:/qt5/qtbase/win32-msvc2019 from a separate directory outside the Qt source directory and tried to build by running just nmake with no arguments. Any help is appreciated. Thanks in advance. Edit: I tried again after re-configuring and this time not passing -static at all, but it still failed. Here's the build log from the recent try: https://gist.github.com/DragonOsman/c13d23ceca50244fb4a195f67d8e613d .
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  UNSOLVED Can't open text file resource
  • rejuce  

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  UNSOLVED Building QT for WebAssembly on windows
  • GaryT  

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  That is great news. Thanks again.
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  UNSOLVED /home/web_user @ start of app is empty.
  • andreskruse  

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  The javascript FS functions we use for syncing the settings are asynchronous, so the c'tor will complete before the settings file has synced into the wasm sandbox filesystem. That said, there is a change that I have found helps somewhat. If you build Qt yourself, you could try this: https://codereview.qt-project.org/c/qt/qtbase/+/264618
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  UNSOLVED Problems building Qt5 for WebAssembly
  • DragonOsman  

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  You can use the prebuilt Qt for WebAssembly from the official Qt installer. Anyway, since your compilation fails on Qt3D, try skipping that module.
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  SOLVED Assert Failure in expandVariableReferences When Configuring Qt 5 for WebAssembly Build
  • DragonOsman  

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  I think the reason for the Assert Failure errors is that I forgot to delete the files in the qtbase folder after a given build attempt. I think that's fixed now, but I still have some issues in building Qt so I'll open a thread now.
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  UNSOLVED Qt WebGL Font Issues
  • narayanan.krish  

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  I am not even sure QtWebGL works with emscripten/ QtWebAssembly
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  SOLVED Opening File Dialog crashes App using Qt for web assembly and emsdk with upstream backend
  • DamienL  

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  @DamienL QFileDialog::getOpenFileContent is the workaround for accessing system/local files due to the javascript sandbox that webassembly lives in.
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  UNSOLVED How to link 3rd party libraries?
  • Vadi2  

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  @Vadi2 Other than adding your libs with LIBS += -lblahblah you shouldn't have to pass anything extra to Qt to get it to link statically, as QtWebAssembly does that anyway. You could try QMAKE_LFLAGS += -static in your project if there is any issues, or it tries to link dynamically.
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  UNSOLVED Qt Design Viewer .qmlrc?
  • kuersat  

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  This thread can be closed. For those who are looking for an answer: Build Qt UI Application for .qmlproject file. Attention: JS doesnt work within the project if the aim is to deploy with Qt design viewer
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  SOLVED Cannot open app on firefox(exception thrown: 15354424) but work with Chrome
  • tham  

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  Firefox 70.0 works again.
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  UNSOLVED WebAssembly.Memory cannot be cloned in this context
  • nagyimre  

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  In Firefox Nightly or Developer Edition only, it should now be possible to set the preference "dom.postMessage.sharedArrayBuffer.bypassCOOP_COEP.insecure.enabled" to "true" in about:config to allow development in simpler environments (ie the headers will not be required). Going forward, deployment to Beta and Release browsers will still require the headers and HTTPS. Do let us know if development remains difficult.
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  UNSOLVED Which version of the emscripten I should use for Qt5.14 beta1
  • tham  

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  @lorn-potter Compile the app with 1.38.43, got error messages Fatal: error in validating output shared:ERROR: '/home/yyyy/Qt/3rdLibs/emsdk/fastcomp/bin/asm2wasm chinese_teacher.temp.asm.js --total-memory=16777216 --trap-mode=allow -O3 --mem-init=chinese_teacher.js.mem --mem-base=1024 --wasm-only -o chinese_teacher.wasm --mvp-features' failed (1) Makefile:316: recipe for target 'chinese_teacher.js' failed make: *** [chinese_teacher.js] Error 1
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  UNSOLVED Qt Creator webassembly: calendar widget doesn't compile
  • Vadi2  

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  @Vadi2 said in Qt Creator webassembly: calendar widget doesn't compile: I've tried compiling the calendar widget using the new webassembly support in Qt Creator 4.11 beta, and it took a really long while to print out the entire text representation of the program, and then failed with: Its not supposed to print out that wasm text in that way. Something qtcreator is doing is breaking the build. Building will still work when you do it from the commandline and using the Qt wasm binaries.
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  SOLVED Sql positiotioning
  • niqt  

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  @niqt said in Sql positiotioning: Have i do use some "special" compilation option? My guess is that you did not compile those modules
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  SOLVED QNetworkConfigurationManager QSharedMemory unknown
  • niqt  

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  Hi, Although QNetworkAccessManager is supported, QNetworkConfigurationManager is not. That said, there is a patch that implements a very simple configuration plugin for wasm, but this is out of date that you could use if you really needed to know if/when your app is online. https://codereview.qt-project.org/c/qt/qtbase/+/235844
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  UNSOLVED Webassembly: module QtQuick.Shapes is not installed
  • wincak  

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  SOLVED Configure script says C++14 support is not available
  • DragonOsman  

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  I managed to get it working. I just need to know how I can get Emscripten to generate the notepad_ui.h header file from the uic file. For now I built it from within Qt Creator itself using the MSVC 2017 compiler, but I do want to know how to do it with Emscripten from the command line. I also created the menus in such a way that clicking them gives you a dropdown with one item with the same text as the button where you have to click the dropdown to perform the action. Is there a way to do it without needing to create the dropdown? Also, how do I change the configuration from Debug to Release? Edit: I changed it to Release mode just fine so never mind that. Anyway, although I can build it just fine in Qt Creator, trying it with Emscripten on the command line keeps failing. I get exceptions from the Emscripten script. If Qt developers can help with this, maybe I should open a new issue asking for help on building Qt apps to Wasm. And for some reason, when running the app, I have to choose a font twice from the font selection dialog box when I click on the menu button for selecting a font. I also don't understand why it won't just create an action in Action Editor the moment I create a menu item. Why do I have to click on the "Type here" that comes up when I click on that and create another menu item there for the same action for it to work?
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  UNSOLVED Trying to load qml files dynamically with javaScript in relation Qt for WebAssembly
  • kuersat  

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  There is a way to 'persist' files, but you need to sync them from the local system into the sandbox. https://emscripten.org/docs/api_reference/Filesystem-API.html Using the IDBFS you can copy files to a mounted IndexDB filesystem. In fact, QSettings on wasm uses this to attempt to persist QSettings.
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  UNSOLVED Issues Found When Trying to Build
  • DragonOsman  

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  Hi, Any reason why you are not using qmake?
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  SOLVED Exclude SUBDIRS in .pro when compiling with WebAssembly
  • David_001  

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  wasm or emscripten? I've been using the latter and it works.
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  UNSOLVED The app developed by Qt for wasm do not looks good on mobile browser
  • tham  

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  @lorn-potter Thanks, tried, can show the widgets but the ui components are too small, any suggestions to solve this issue? By the way, do you know any way to make the QLineEdit accept non ascii input?This question is related to QTBUG-78826. I load the fonts already, can paste the words from text file to QLineEdit or print the non ascii characters by program, but the QLineEdit cannot type the non ascii characters on it directly. QFile ifile(":/fonts/wqy_compress"); if(ifile.open(QIODevice::ReadOnly)){ auto const font_id = QFontDatabase::addApplicationFontFromData(qUncompress(ifile.readAll())); qDebug()<<__func__<<"font id:"<<font_id; font_family_ = QFontDatabase::applicationFontFamilies(font_id).at(0); } QFont const monospace(font_family_ ); ui->lineEditNewChar->setFont(monospace); Any suggestions?Thanks
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  SOLVED Issue with running configure.bat (Windows)
  • DragonOsman  

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  @DragonOsman said in Issue with running configure.bat (Windows): Should I close this one and open a new thread for these questions or is this thread fine? Yes please, so other users can expect to find answers to the issue based on topic title. If not, the solution(s) for the new issue will be embedded within the posts.