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 File system support workerfs
  • AdamCTKC  

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  UNSOLVED What do I need to do to get quick3d + wasm working?
  quick3d • • timday  

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  @timday I've the same problem as your. Have you managed to solve your issue?
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  UNSOLVED Is getTimezoneOffset() javascript's date function broken...?
  • oria66  

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  Yes, it is broken. I have made a Qt bug report and will fix when I have time. https://bugreports.qt.io/browse/QTBUG-91441 Thanks!
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  UNSOLVED Code 404 -- Message file not found
  error wasm emscripten • • TMJJ001  

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  UNSOLVED Compiling QT on ubuntu/ARM for WASM
  • dreamlax  

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  Emscripten does not run on native arm on any OS. On Mac M1, it requires the Rosetta 2 emulation to work. "emsdk only officially supports x86_64 today." https://github.com/emscripten-core/emsdk/issues/671
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  UNSOLVED Use QHttpMultiPart impossible compile for WebAssembly(maybe bug)
  • Adl78  

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  Because the change that adds multipart support for wasm, 6b171dc6c0c0f0a822b212df77b58b28bd92716c, is not in 5.15.x, but will be part of Qt 6 webassembly. That said, that patch would probably apply fairly cleanly to 5.15 if you want to to recompile Qt.
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  UNSOLVED Qt for WebAssembly Checkboxes and Comboboxes displayed wrong
  • Jonas Ritz  

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  UNSOLVED compile slate sample project problem.
  • Alan Lee  

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  UNSOLVED Android chrome - portrait orientation black screen
  • mccat  

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  UNSOLVED Is it possible to embind Qt class that has a signal in emscripten?
  javascript signals & slots webassembly emscripten embind • • AliGB  

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  I am not sure Qt signals would work. You should certainly be able to so callbacks though.
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  UNSOLVED Unable to input Chinese (Chinese characters) ?
  • Jonix King  

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  @lorn-potter Thank you very much. I know how to display Chinese characters normally： int fontId = QFontDatabase::addApplicationFont(QStringLiteral(":/fonts/msyh.ttf")); QStringList fontFamilies = QFontDatabase::applicationFontFamilies(fontId); if ( fontFamilies.size() >0 ) { QFont font; font.setFamily(fontFamilies[0]); app.setFont(font); } But ... Just can't input Chinese characters The problem made it impossible for me to start Chinese software. @_@
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  SOLVED QNetworkAccessManager (HTTPS-Request)
  • David_001  

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  Thanks, HTTPS interfaces can be used without any problems. Unfortunately, I had a thinking mistake here. Thanks Lorn
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  SOLVED Qt WebAssembly with OpenCV
  • ihmc  

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  @linoleo Hey, sorry for replying lately. The problem should be a bug in Firefox like @haiku said. You should use opencv.js instead, it is not solved actually.
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  UNSOLVED How to achieve RTSP web-assembly module
  • Sparshme5  

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  This is on my list of things to do, but probably won't get done. You can use javascript WebRTC API to implement this and use Emscripten's built-in ways to access the javascript API from c++ https://emscripten.org/docs/porting/connecting_cpp_and_javascript/Interacting-with-code.html
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  UNSOLVED Calling C++ function from JavaScript through Webassembly
  javascript function webassembly wasm export • • AliGB  

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  You need to export those by adding linker arguments: https://emscripten.org/docs/porting/connecting_cpp_and_javascript/Interacting-with-code.html#interacting-with-code-ccall-cwrap
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  UNSOLVED How does Qt call C++ functions from JavaScript through webassembly?
  javascript function webassembly export • • AliGB  

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  It is possible to call c/c++ functions from javascript as well as call javascript from c/c++. Look at https://emscripten.org/docs/porting/connecting_cpp_and_javascript/Interacting-with-code.html
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  UNSOLVED Pre-built Qt for WASM with threaing enabled
  • terma.aba  

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  Threads are still considered experimental in webassembly, in the browsers as well as Qt WebAssembly. Which is why we do not enable them by default. They require the user to tweak the browsers config settings. They also need to be served from https due to the shared memory. AND they are not real threads, and so work a bit different than unix threads, so it can be a bit tricky.
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  UNSOLVED WebAssembly and sound effects
  • KroMignon  

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  @lorn-potter said in WebAssembly and sound effects: It is! I posted eample who - you just need to use javascript, which emscripten has several ways to implement - using macros or straight c++. I don't want to hurt you, there no raison for me to do it. I have followed the Qt mailing lists, and I know that Qt embrasse many domains. The Qt company had to made choices to ensure they will win enough money to pay their developers, which is fine. But I need a solution now to replace some Flash plugins I have developed for years. I tried Qt WASM because I know Qt and QML and I know how to work with. I tried it hard to made it works, and really takes days to be able to build successfully a basic example. The build itself takes close to 15 minutes. And I wasn't able to start debugger. Doing the same with Blazor was very easy, in one day I have installed all needed software, build a demo application (in less than 20 seconds on same machine) and be able to do debugging. Those are fact, and I don't have so much time to create a new plugin. My prefered choice would be Qt WASM but I have to be "raisonnable" and go with Blazor.
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  UNSOLVED How to set up the Qt for WebAssembly compiler ?
  • Anton1978  

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  @Anton1978 I wonder if your question actually: 'how to set up WASM compiler in Qt Creator' ? I simply couldn't get this to work (5.15.2). A co-worker had the same trouble independently, so I don't think it was just me. I gave up and worked with only qmake, make. This worked.
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  UNSOLVED Webassembly 5.15.0 Win10 won't compile
  • qthor  

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  Can you try 5.15.1 or 5.15.2, as there was a bug on windows that stopped those files from being copied.
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  UNSOLVED Problem running configure for wasm on Windows
  • GaryT  

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  @YongQ wow u r so damn good
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  UNSOLVED How to handle closeEvent with the QDialog .open() instead of .exec()?
  • DZucchetti  

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  Just to be sure I understand the issue: you may have multiple documents to save and each asks to save separately ?
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  UNSOLVED Which QNetworkReply error for connection timeout ?
  webassembly timeout 5.15 • • Mixlu  

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  I just saw that a QNetworkReply::TimeoutError code exists. Shouldn't this code be set when a timeout occurred ? Is this a bug or did I misunderstand something ?
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  UNSOLVED Help Developing New Tool (Open Source)
  • Muser  

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  Hi, Please do not the same thread on multiple sub-forum. One is enough Duplicate Closing this one.
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  UNSOLVED Qt WebAssembly Unable to Build: redefinition of '__glewCreateProgram' as different kind of symbol
  qt creator webassembly build failed • • ConfusedKeystrokes  

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  @lorn-potter Thanks for getting back to me! I'm trying to build this project: https://github.com/herewegoblueno/cs1230-final Just to provide context, this works well when built for Mac. And yes I am importing GL/glew.h myself. Also by the way I've also noticed that the compilers don't recognize the standard libraries like <vector>, <map>, etc (or maybe that's just the static checker? not sure if those will result in compile time errors since I can't build due to glew anyways)
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  UNSOLVED Uncaught error in webassembly but not in android or native with the same qml ui
  • r0ller  

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  Hi, What I'm doing on Android is the following: I build a qml ui and some corresponding c++ and inline js code that make sure that the qml ui can communicate with the android java layer through the android webview utilizing webchannel messageing. See: https://github.com/r0ller/qwa/tree/main/qmlwasm1 Files: main.qml (just the ui logic) main.cpp (opening webchannel port) messageboard.cpp (sending/receiving messages through webchannel port) The java layer passes the call to a c/c++ backend lib via JNI and the returned response is sent back to qml via webmessage channel. The corresponding code: https://github.com/r0ller/qwa/blob/main/Android/qmlwasm1/app/src/main/java/com/bitroller/qmlwasm1/MainActivity.java All that works fine, the error does not appear in the Android but only in the nodejs use case when reloading the client from the nodejs server. However, the ui part what gets loaded from the server is the same what I load in the webview on Android. I also don't get any errors when the project is built with the same qml ui as native. By the way, you can find both the apk and the nodejs code in the repo so running the nodejs variant is just issuing "node index.js" in the qwa_node directory after cloning ;) Installing the apk of course is a few clicks and taps more. (Yesterday I added a springanimated rect to the qml ui which I did not copy over to the android project so there's a difference but that's not the point here.) BR, r0ller
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  UNSOLVED Get URL / local IP in Qt WASM
  wasm url ipv4 • • Ollie_A  

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  UNSOLVED Wasm not updating without an event (mouse, keyboard)
  • Ollie_A  

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  @JonB Sorry for the late reply. I ended up using a timer ticking every 0.5 seconds that seemed to work, but that does also sound like it might have been in with a shot of working! Cheers.
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  UNSOLVED TextInput not editable in browser
  • SyntaX  

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  I noticed, that although I am not able to "write" Text in the input field, I can paste text from elsewhere?
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  UNSOLVED Configuring Qt for WebAssembly and Emscripten
  webassembly qt 5.15 compiler error emscripten • • ronaldo  

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  dunno if you managed to resolve your problem in the meantime, but I had a similar error (under macOS and emscripten 1.39.17): After downloading and installing everything, I ran emsdk_env (which should generate the ~/.emscripten file in the user folder, if I remember correctly) But it seems, that Qt Creator could not resolve the var for the defined emsdk_path emsdk_path = os.path.dirname(os.environ.get('EM_CONFIG')).replace('\\', '/') so I replaced all the placeholder with the explicit path: emsdk_path = '/Users/myuser/Documents/Programming/emsdk' I also added COMPILER_ENGINE = NODE_JS JS_ENGINES = [NODE_JS] at the bottom (not sure though if that was needed) After restarting Qt creator the compiler and toolkit for WebAssembly wer successfully recognized.
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  UNSOLVED Qt WebAssembly compiler error
  • Noob pilot  

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  @jsulm here is what i did now Right click on the project and clean Rebuild Remove the build folder run qmake --getting this general message Compiler feature detection failure! The command "/home/noob-pilot/emsdk/upstream/bin/clang -dumpmachine" could not be started. Compiler feature detection failure! The command "/home/noob-pilot/emsdk/upstream/bin/clang -print-search-dirs" could not be started. Compiler feature detection failure! The command "/home/noob-pilot/emsdk/upstream/bin/clang++ -dumpmachine" could not be started. Compiler feature detection failure! The command "/home/noob-pilot/emsdk/upstream/bin/clang++ -print-search-dirs" could not be started. Compiler feature detection failure! The command "/home/noob-pilot/emsdk/upstream/bin/clang -dumpmachine" could not be started. Compiler feature detection failure! The command "/home/noob-pilot/emsdk/upstream/bin/clang -print-search-dirs" could not be started. Compiler feature detection failure! The command "/home/noob-pilot/emsdk/upstream/bin/clang++ -dumpmachine" could not be started. Compiler feature detection failure! The command "/home/noob-pilot/emsdk/upstream/bin/clang++ -print-search-dirs" could not be started. *run the project getting this error again (without the warrnings this time)
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  UNSOLVED Qt Webassembly number of screens
  webassembly screen monitor • • AliGB  

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  WebAssembly error/bug ?! float unrepresentable in integer range
  • Edwin F.  

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  BINARYEN_TRAP_MODE=clamp has been part of Qt WebAssembly since before is was integrated into Qt proper. Look at: mkspecs/wasm-emscripten/qmake.conf It is not needed for WASM_OBJECT_FILES, which is now the default, so it was removed in the 5.15 series. There was a typo (a missing + in +=) for a while that stopped it from actually being used
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  This topic is deleted!
  • LorenDB  

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  UNSOLVED How to use gzip in WASM qt?
  • Quang Phu  

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  SOLVED How to do callbacks/slots in Qt for WebAssembly?
  • Edwin F.  

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  @Edwin-F WebSockets are two way communication, but only a client process can run on WebAssembly/browser. https://doc.qt.io/qt-5/qtwebsockets-index.html
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  UNSOLVED Including pybind11 causes Emscripten to fail build
  • Edwin F.  

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  SOLVED Qt webassembly and Layouts
  c++ webassembly layouts glitch viewtable • • AliGB  

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  Found the problem: I had installed Qt v 6.0.0 with emscripten 1.39.8. documents say 1.39.8 should work with Qt v5.15.0. Works after installing the correct Qt version.
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  SOLVED Qt Webassembly with WASI (lucet, wasmtime)?
  • AliGB  

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  Thank you.