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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  I installed the latest version of Emscripten. I did need to execute git pull just now though. But it could be that the version I have is too new for Qt (could that be the case?). By the way. Do you understand what I mean when I say "Emscripten Wasm backend"? That's the backend I'm using. It's the one using LLVM without the Emscripten changes to LLVM. Basically "vanilla" LLVM which you need the latest tip-of-the-tree version of. Later than the current stable version. The regular backend is called the Fastcomp backend. I heard they're going to make the Wasm backend the default backend. And the BINARYEN_TRAP_MODE setting being used is bad for the Wasm backend. (I don't mean to look down on you or anything. I'm really just checking to make sure we're on the same page here.) I don't understand what the condition is in the Makefile that has to be false for the EMCC_COMMON_LFLAGS += -s \"BINARYEN_TRAP_MODE=\'clamp\'\" line to be added in its else clause. What kind of object files is it looking for?
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  UNSOLVED How to link 3rd party libraries?
  • Vadi2  

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  On Windows we build them, on Ubuntu we install the -dev packages, on macOS we use Homebrew.
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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 WebAssembly.Memory cannot be cloned in this context
  • nagyimre  

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  We're trying to implement a workaround for FF Nightly and DevEd to ease developer pain: https://bugzilla.mozilla.org/show_bug.cgi?id=1587394.
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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.
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  UNSOLVED Virtual keyboard crash when I try to select input methods(chinese, english etc) on browser
  • tham  

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  @mrjj Thanks for your helps, post a bug at JIRA, 78825
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  UNSOLVED Cannot enter non ascii characters to the TextField and QLineEdit from browser(wasm)
  • tham  

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  Post a bug at JIRA, 78826
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  UNSOLVED Qt for WebAssembly on Windows 10
  • ac1975  

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  Hi, first of all: Are you using a linux subsystem? Because you need to use Linux its not possible on windows. The secon thing is that the Qt mkspecs need to be specified in the compilers sub. In em and em++ both need to have "wasm-emscripten" as Qt mkspecs. The third thing is that actually it is still not possible to to build via Qt Creator. You need to use qmake and make. After running them the project is build and you are ready to go with a webserver like the simple python one. From there you just open the .html. If you need more help just message me, had some issues too as right now there is still the same warning on my linux system as you have with QtVersions. I'll figure that one out soon didn't deal with it until now.