Qt for WebAssembly

Okay I will try it out. Thanks

Exporting directly to PDF or Excel in a web browser is tricky due to security concerns. Here are some workarounds: Client-side libraries (limited): These libraries create a file-like representation of your table, but it might not be a perfect PDF or Excel. Users would need to save it manually. Server-side generation (better): Send your table data to your server. The server creates a real PDF/Excel file and sends it back for download. This offers more control and lets users directly download the file. Third-party services (alternative): These services convert your data to PDF/Excel in the cloud. You might need extra setup and potentially pay fees depending on the service. The best option depends on your needs (security, complexity, file format). Let me know if you want to explore a specific solution further!

Okay, I have submitted the bug here: https://bugreports.qt.io/browse/QTBUG-127425

I'm a f*ing moron, never mind. //old y:smallestSide - height ... //"fix" y:Math.max(smallestSide - height,0)

The Emscripten issue: emscripten_set_mousedown_callback does not call the callback function from Qt Creator

The bug report was closed because You need to handle this in a javascript mouse event and not a Qt mouse event. I will continue here: https://forum.qt.io/topic/157373/emscripten_set_mousedown_callback-does-not-call-the-callback-function

Lorn Potter added a comment in the bug report The mouse cursor is owned by the browser, and apparently setting mouse position in the browser is not allowed due to security issues. I will continue to find another way to lock a mouse cursor in the following topic: emscripten_request_pointerlock() returns EMSCRIPTEN_RESULT_UNKNOWN_TARGET

pro: wasm: INCLUDEPATH += "C:\emsdk\upstream\emscripten\cache\sysroot\include" Settings for Qt 6.6.3: [image: cfcca9e8-504f-4829-bdc6-ce7012964b63.png]

I had a problem with connection with the server on the free Glitch hosting from WASM. I solved it by setting User-Agent. I use Qt 6.6.3. Maybe it will help: QUrl url("wss://merciful-regal-soursop.glitch.me"); QNetworkRequest request; request.setUrl(url); request.setRawHeader(QByteArray("User-Agent"), QByteArray("Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 " "(KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36")); m_webSocket.open(request); And I had another problem with connection from Android. I was solved it like this: Get data with Qt client from deployed Node.js server using WebSockets

I have replaced the follwing line in the code example above: #ifdef Q_OS_ANDROID with this one to detect iOS too: #if defined Q_OS_ANDROID || defined Q_OS_IOS

Solution is to add the following INCLUDEPATH: QT += core gui widgets INCLUDEPATH += "C:\emsdk\upstream\emscripten\cache\sysroot\include" CONFIG += c++17 SOURCES += \ main.cpp To avoid conflicting declaration do not compile for Desktop. Compile for WebAssembly.

This worked for me: QMAKE_LFLAGS += -Wl,-error-limit=0

Hello @jhayar, It seems like you're facing issues with accessing a Qt application running as WebAssembly (WASM) from other devices within the same private network. Ensure your Qt application is configured to listen on localhost (127.0.0.1) and try accessing it from another device using the host machine's IP address instead of localhost. Double-check your network configuration to ensure that devices within the same subnet can communicate. If your Qt application is served through a web server like Nginx or Apache, ensure that CORS headers are correctly set to allow access from other IP addresses within your private network. Although HTTPS is recommended for security, if it's not feasible for your private setup, consider alternatives like configuring your network or application to allow HTTP connections securely within your private environment.

@semlanik said in configuring QT with webassembly issue: failed on Qt6ProtobufTools, WrapProtoc not found: -skip qtgrpc also can help in this case, if you don't need it in your Qt build. Yep - or uninstall Qt Protobuf component using the maintaince tool.

@jsulm Thank you for your answer. I forgot to mention it. In fact, my chrome has enabled JSPI, but the error is as mentioned above...

Probably not, as Qt3D makes liberal use of threads, and webassmbly (WebGL) only works in the main thread (WebWorker)

With normal caveats regarding "threads" (web workers in web parlance) you could just run your data simulation in a thread and then use the main thread to update your VBO and render.

It works now on Chrome. I just have restarted Qt Creator.

@Saju I didn't use OpenCV. But try these steps that I use for another libraries: Add C:\emsdk\upstream\emscripten to the Path variable cd opencv-1.2.3 && mkdir build && cd build emcmake cmake .. emmake make INCLUDEPATH += "E:/libs/opencv-1.2.3/include" LIBS += -L"E:/libs/opencv-1.2.3/build/lib" LIBS += -lopencv