Qt for WebAssembly

Now I understand a little better what you are asking. I am not sure if there is such a thing as querying if a module exists. I'm also not using wasm and don't know if you can actually distinguish between singlethreaded and multithreaded. Here is the easiest workaround that comes to mind: Create a CONFIG variable like singlethreaded. Then you can check for it: CONFIG(singlethreaded): { } else: { QT += concurrent } On the "command line" you just add qmake CONFIG+=singlethreaded ... to your call to qmake. In QtCreator under "Projects" for the wasm_singlethreaded kit you just add CONFIG+=singlethreaded as "Additional arguments" under the qmake build step.

@Christian-Ehrlicher thank you, so the working solution is SOLVED: <!DOCTYPE RCC> <RCC> <qresource prefix="/"> <file>qml/main.qml</file> </qresource> </RCC> and #include <QGuiApplication> #include <QQmlApplicationEngine> #include <QUrl> #include <QDirIterator> int main(int argc, char *argv[]) { QGuiApplication app(argc, argv); QQmlApplicationEngine engine; engine.load(QUrl(QStringLiteral("qrc:qml/main.qml"))); if (engine.rootObjects().isEmpty()) return -1; return app.exec(); } I am happy!!!

@Mesrine Thanks, I also realize it is this problem and am trying to compile multi-threaded Opencv-wasm library

check https://forum.qt.io/post/775817

Thank you @jsulm for the response. Here is my CMakeLists.txt below: CMakeLists.txt cmake_minimum_required(VERSION 3.16) project(demoApp VERSION 0.1 LANGUAGES CXX) set(CMAKE_CXX_STANDARD_REQUIRED ON) set(CMAKE_AUTOMOC ON) set(QT_QML_GENERATE_QMLLS_INI ON) find_package(Qt6 6.4 REQUIRED COMPONENTS Quick Network Sql WebSockets ) # find_package(MySQL REQUIRED) qt_standard_project_setup(REQUIRES 6.4) qt_policy(SET QTP0001 NEW) qt_add_executable(appdemoApp main.cpp ) qt_add_qml_module(appdemoApp URI demoApp VERSION 1.0 RESOURCE_PREFIX / SOURCES mainworker.h mainworker.cpp applogger.h applogger.cpp icons/Resource.qrc QML_FILES Main.qml Login.qml Userreg.qml ) # Qt for iOS sets MACOSX_BUNDLE_GUI_IDENTIFIER automatically since Qt 6.1. # If you are developing for iOS or macOS you should consider setting an # explicit, fixed bundle identifier manually though. set_target_properties(appdemoApp PROPERTIES # MACOSX_BUNDLE_GUI_IDENTIFIER com.example.appdemoApp MACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION} MACOSX_BUNDLE_SHORT_VERSION_STRING ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR} MACOSX_BUNDLE TRUE WIN32_EXECUTABLE TRUE ) target_link_libraries(appdemoApp PRIVATE Qt6::Quick PRIVATE Qt6::Network PRIVATE Qt6::Sql PRIVATE Qt6::WebSockets ) include(GNUInstallDirs) install(TARGETS appdemoApp BUNDLE DESTINATION . LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} ) I was thinking I could be linking to a wrong library and mysql include directory however, Cmake runs the configurations very well and indicated MYSQL:MYSQL is found.

@davidweisgerber hi, Since you dived in already, I would encourage you to submit a patch to improve the documentation on that aspect.

I think I might have a similar problem. Any update on your original issue?

If I remember well, this SharedArrayBuffer is needed when using wasm multithreading. If your app does not need multithreading, use Qt wasm single threading. If multithreading is needed, check https://forum.qt.io/post/765010

@mv-whw Thanks for answering Yes, that is the solution, putting inside my hosting public www folder all my resources: index.html main.wasm images/image0.png images/image1.png inside the wasm code: Image { source: "images/image0.png" } That worked well... and is very nice, this saves a lot of loading times..

@Jan-Bakker Hey, sorry for answering an answered qustion. Justo happy to read it, so, it is possible to load external images in Your web app so your wasm file is smaller?

@Caro You might start by Googling webassembly memory () could not allocate memory and read through the other reports and comments.

@SGaist said in Qt 6.8.2 for wasm on android, the keyboard always auto popup ?: Can you share the bug report ? https://bugreports.qt.io/browse/QTBUG-134917 https://bugreports.qt.io/browse/QTBUG-133781

There are two fantistic api in c++ #ifdef __EMSCRIPTEN__ #include <emscripten.h> // Required for calling JavaScript #endif #ifdef __EMSCRIPTEN__ // WebAssembly-specific code emscripten_run_script("console.log('Running in WebAssembly');"); #endif #ifdef __EMSCRIPTEN__ const char* url = emscripten_run_script_string("window.location.href"); qDebug() << "Current Page URL:" << url; #endif

For WebAssembly you cannot use theme icons directly but must use the Qt Ressource System

This might be QTBUG-133781, which release are you using ?

The solution to the problem is to add the header res.addHeader("Access-Control-Allow-Origin", "*"); to the HTTP server; hServer.route("/", QHttpServerRequest::Method::Get, []() { QString testAnswer = "TEST REPLY"; res.addHeader("Access-Control-Allow-Origin", "*"); // Added line QHttpServerResponse res(testAnswer, QHttpServerResponse::StatusCode::Ok); return res; }); After adding this line, the browser forwarded the reply to my application.