web – weiy.city

How was emscripten_set_wheel_callback_on_thread generated in wasm file

We had met a bug about _emscripten_set_wheel_callback_on_thread in web app based on wasm. Relative post: https://www.weiy.city/2025/02/uncaught-typeerror-cannot-read-properties-of-null-reading-onwheel-from-_emscripten_set_wheel_callback_on_thread/ Let’s explore how was the function generated in the final wasm file. The function _emscripten_set_wheel_callback_on_thread was from emscripten_set_wheel_callback_on_thread in src/library_html5.js. Read js files and html5.h under emsdk to find the called logic. Code in Read more…

By StephenWei, 3 weeks2025-03-02 ago

Web

WASM – Aborted(Assertion failed: attempt to write non-integer (undefined) into integer heap)

There is Aborted crash on browser when I resize window. My web app is based on VTK wasm. Check uiEventHandlerFunc in Test.js: Then we can read /emsdk/upstream/emscripten/src/library_html5.js and find registerUiEventCallback and uiEventHandlerFunc on the file. There is checkInt32(e.detail) in registerUiEventCallback in exported js file Test.js which was generated from emsdk Read more…

By StephenWei, 3 weeks2025-02-28 ago

Web

Two-layer multithreaded loops in the web consume more resources than single-layer loops

WebAssembly’s std::thread underlying Web Workers relies on the browser, which has a strict limit on the number of Workers that can be active at the same time (usually the number of physical CPU cores, such as 4-8). Why does a two-tier loop (say 10×10) create threads that consume more resources Read more…

By StephenWei, 4 weeks2025-02-23 ago

Web

Write stl to wasm virtual memory and read it by wasm module

Here is an example about how to write stl file to wasm virtual memory and make wasm module read it. We need to add write file logic in onRuntimeInitialized for wasm module. index.html: C++ code for wasm module: binding.cpp Worker.cpp All code has been upload to GitHub: https://github.com/theArcticOcean/webLib/tree/main/threadTest

By StephenWei, 4 weeks2025-02-23 ago

Python

Python Script For http.server To Support SharedArrayBuffer

Configure the SharedArrayBuffer response header in the http.server module of the Python standard library to enable the server to support a web multithreading environment. Let’s support SharedArrayBuffer on web browser. SharedArrayBuffer is a JavaScript object that allows multiple WebWorker threads to share the same memory space. This means that different Read more…

By StephenWei, 4 weeks2025-02-23 ago

VTK

Save Points To File In VTK WASM And Desktop App Environment

Desktop App Environment VTK WASM

By StephenWei, 2 months2025-01-22 ago

Tool

New Tool – Midjourney Drawing Prompts

Are you an aspiring artist or a storyteller looking to bring your ideas to life through AI-generated art? Or maybe you’re a seasoned creator who needs fresh inspiration for your next masterpiece? Look no further – our free tool, Midjourney Drawing Prompts, is here to help you unlock your creativity Read more…

By StephenWei, 3 months2024-12-17 ago

Tool

Fix Bug About Generating Zip By Tool PDF To PNGs

We had fixed an issue about generating pngs zip by online tool PDF To PNGs. Now you can upload your PDF file and download the new zip file which contains all pages. Every page becomes an image in the zip file. This is a free office online tool, just use Read more…

By StephenWei, 4 months2024-12-05 ago

Tool

New Tool – SEO Data Analyst

We have released an SEO analysis tool, and the tool’s address is: Input your article, the tool will analyze it and provide you with SEO information to help you easily fill in the SEO Title, Keyphrase, and Meta Description. Why SEO Analysis is Crucial for Your Website’s Success The world Read more…

By StephenWei, 4 months2024-11-14 ago