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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  UNSOLVED Any possibility for text input on iOS?
  • matthk  

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  Short explanation is that the webassembly qpa plugin has no support for the input context. :)
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  UNSOLVED "The command line is too long" when building the app
  webassembly line too long emsdk • • M1losz  

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  https://bugreports.qt.io/browse/QTBUG-84392 With Qt 6.2, you can use qt-cmake to build examples, which does not have this issue.
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  UNSOLVED Right Mouse Button is not detected
  qml mousearea wasm mouseevents • • lonelyteapot  

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  This is already fixed in 6.2.3, and 6.3
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  SOLVED include windows.h
  • Renio  

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  windows.h is not part of the emscripten sdk, as it does not have the Javascript port of the windows API. You could port those parts to Qt or SDL.
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  UNSOLVED Qt 6.2.2 Webassembly - sign conversion errors
  • AxelVienna  

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  Without having the faintest of clues about the actual problem, at a glance it looks to me like some missing/incomplete/bogus library support issue. I suggest you bring this to the mailing list, we don't get much traffic for wasm here.
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  UNSOLVED Question over Qt / Web Assembly / Csharp (WebAssembly) interop
  • garlicbread  

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  This topic is deleted!
  • raghav chauhan  

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  UNSOLVED WebAssembly & JavaScript Comparison Fail
  javascript performance webassembly comparison • • roberto__belam  

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  UNSOLVED Example of OpenGL texture in Qt WebAssembly?
  • Seishin  

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  @lorn-potter Yes I want to do something like put a texture on the cube surface in WebAssembly. Could I ask what Qt components should I use? Currently I tried QQuickFramebufferObject and QQuickItem (following the "Scene Graph - OpenGL Under QML" example), but haven't get a successful texture rendering in Chrome browser on Ubuntu 20.04 (Qt version 5.15.2). I also tried without WebAssembly using QOpenGLWidget, in this way the texture works normal.
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  UNSOLVED Unit testing framework
  • GaryT  

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  Thanks Lorn, I will give that a try. Gary
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  UNSOLVED QNetworkReply fault
  qnetworkrequest qnetworkaccess • • Renio  

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  Need more information, such as Qt version, any messages you may see in the browser console.
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  UNSOLVED Configuring Qt6.2 fails on QtShaderTools
  • mortbopet  

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  I got the same error. Tried the compilation with two other gcc versions above 8.1 (Strawberry:8.3.0,Mysys2:11.2.0 ) different skipped packages, so there are no open dependencies Qt version: 6.2.1 (produced the identical error) perl 5.32.1 python 3.9.7 ruby 3.0.2p107 cmake version 3.22.0-rc2 ninja 1.10.2 Windows 11
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  UNSOLVED Qt 6.2.1 CMake build generates app.js and app.wasm files for my project, but not the expected app.html and qtloader.js. What am I doing wrong?
  • timday  

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  Try changing add_executable to qt_add_executable
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  This topic is deleted!
  • Seishin  

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  UNSOLVED Configuration issue with Webassembly
  • GirishSharma  

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  @GirishSharma Any update Please?
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  SOLVED What do I need to do to get quick3d + wasm working?
  quick3d • • timday  

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  Cool! If you see any issues, be sure to report them to https://bugreports.qt.io/
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  UNSOLVED emsdk/upstream/emscripten/emrun: 9: Syntax error: word unexpected (expecting ")")
  • idlefrog  

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  @Seishin Am stuck with the old Qt Creator 5... but thanks for the help :) (Never got around that problem in the end, and gave up!)
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  This topic is deleted!
  • Seishin  

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  UNSOLVED Hello World app with QML & WebAssembly not working
  • ericg_97477  

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  @ericg_97477 I ended up trying an alternate way to use emrun... $ emrun --no_browser --port 8080 ./default.html Web server root directory: /Users/ericg/depot_qt/default/build Now listening at http://0.0.0.0:8080/ I then went to http://0.0.0.0:8080/ in the browser. I was shown the expected page: Directory listing for / with all of the files in my build folder. When I clicked on default.html, I saw the QT icon and it a message that it was downloading the program. Eventually, I saw the the hello world message appear. I assume I would eventually be able to take control over the loading screen. So, that worked. Why didn't emrun — browser=firefox *.html?
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  UNSOLVED Qt5Concurrent module missing
  • NightFury  

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  I don't know, sorry. I only tried WASM a few times, years ago.
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  SOLVED Qt Web Assembly application and Next.JS: handle is undefined
  • jpgehrig  

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  Kinda... I documented my findings on https://github.com/jpgehrig/nextqt.
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  UNSOLVED How best to deploy a WebAssembly app
  • idlefrog  

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  @SGaist said in How best to deploy a WebAssembly app: nginx Thank you!...Am a complete beginner. Just the help I needed! I'll try out nginx or something akin. :)
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  UNSOLVED Qt WebAssembly 6.2 - compiling an app using qmake
  • just_a_developer  

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  UNSOLVED Work with Qt and WebAssembly
  • lorn.potter  

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  UNSOLVED WebAssembly and sound effects
  • KroMignon  

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  @JoeCFD said in WebAssembly and sound effects: Use QtGstreamer + gstreamer pipeline. One could, but would have to build gstreamer and all it's friends with emscripten and then statically link that into the wasm binary. Or, could just use QtMutimedia 6.2.
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  UNSOLVED Qt WebAssembly SQL alternatives
  • nsourl  

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  Hi Yes. Due to the sandbox nature, I have not seen any WebAssem that could save the DB as local file , only in memory which clearly won't fit your use case. However, it does seem possible to save to a array and and load from it. If your db is not big, it might be useful https://sql.js.org/#/ I wonder if it would be possible to save and load the DB with javascript and then access it from c++ as in-mem db. However, I never tried it.
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  UNSOLVED QML in Qt 5.15.2 Webassembly
  • nagyimre  

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  Tested: EMSDK 1.38.9: OpenSSL cannot be compiled, since the packed gcc is older than requested EMSDK 1.39.16: Could compile but become frozen. EMSDK 2.0.6: Compiled, but every time I add QQuickView *view = new QQuickView(), the console log says: -- constructing QQuickView qtloader.js:382 Blocking on the main thread is very dangerous, see https://emscripten.org/docs/porting/pthreads.html#blocking- on-the-main-browser-thread and the execution hangs. It is possible that I oversee something, but every other modules are fine: multithreading is running, QGraphicsScene is there and works fine. I have only issue with this QML part.
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  UNSOLVED Is a commercial license subscription needed as long as the website is up or only during development?
  • DF23  

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  @JKSH true, my bad. than thats not an option.
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  UNSOLVED Emscripten version for QT 5.15.2
  • GaryT  

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  Hi, I am currently using EMSDK 2.0.6 with Qt 5.15.2, but IIRC it was possible to compile Qt with ESMDK 2.0.14 as well. The 2.x version of EMSDK greatly reduces the compilation time and feels to be more mature.
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  UNSOLVED creating .wasm ot of qtwebsocket project
  qtwebsocket • • Farnaz  

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  UNSOLVED Generating .wasm file of a QtWebSocket project to use in a react app
  • Farnaz  

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  UNSOLVED failed to asynchronously prepare wasm: LinkError: import object field 'environ_sizes_get' is not a Function
  • Farnaz  

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  SOLVED error: undefined symbol
  webassembly emscripten mingw 64 bit qt 5.15.0 • • Renio  

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  after contact the qt support, they suggest me to replace win32: LIBS += -L$$PWD/../../TinyLib/build-TinyLib-Qt_5_15_0_WebAssembly-Debug/ -lTinyLib with wasm:LIBS += -L$$PWD/../../TinyLib/build-TinyLib-Qt_5_15_0_WebAssembly-Debug/ -lTinyLib
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  UNSOLVED Configuring 6.2 for WebAssembly debugging
  • Kill-Animals  

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  It did not work. I used this line to configure: ./configure -DCMAKE_TOOLCHAIN_FILE='$HOME'/Library/emsdk/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake -qt-host-path /home/anon/Library/qt6.2/qtbase -xplatform wasm-emscripten -debug -prefix $PWD/qtbase -device-option QT_WASM_SOURCE_MAP=1 When I upload the Qt version into QtCreator, the ABI is always x86-linux-generic-elf-64bit Instead of asmjs-unknown-unknown-emscripten-32bit Preventing any build.
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  UNSOLVED Virtual display with scrollbars
  • waslap  

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  UNSOLVED Cannot run target compiler em++
  • SimonR  

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  @SimonR Did you check the Compiler tab to see whether there are any warnings/errors?
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  UNSOLVED Qt/qml frontend for Node-RED
  • r0ller  

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  UNSOLVED Change default logo when compiling
  • Moia  

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  No, that's the proper way to do it. The Qt logo and all the HTML, JS files generated in a project are just some example/ boilerplate code. You are free to replace it.
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  UNSOLVED Get URL / local IP in Qt WASM
  wasm url ipv4 • • Ollie_A  

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  You can use emscripten API to read the JavaScript window.location object. #include <emscripten/val.h> ... emscripten::val location = emscripten::val::global("location"); auto host = location["hostname"].as<std::string>(); auto port = location["port"].as<std::string>();