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podsvirov opened this issue Mar 18, 2025 · 5 comments
Open

Failed to load resource #23949

podsvirov opened this issue Mar 18, 2025 · 5 comments

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@podsvirov
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podsvirov commented Mar 18, 2025 •
edited
Loading

Please include the following in your bug report:

Version of emscripten/emsdk:

$ emcc -v
emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 4.0.5-git (53b38d0c6f9fce1b62c55a8012bc6477f7a42711)
clang version 21.0.0git
Target: wasm32-unknown-emscripten
Thread model: posix
InstalledDir: C:/msys64/clang64/opt/emscripten-llvm/bin

Failing command line in full:

I was just customize Using files example
from Emscripten Tutorial page:

$ mkdir -p out/static
$ ./emcc test/hello_world_file.cpp -o out/static/hello.mjs --preload-file test/hello_world_file.txt
$ cat > out/index.html << EOL
<!DOCTYPE html>
<html>
<body>
        <script type="module">
                import initModule from './static/hello.mjs';
                initModule({
                        print: (text) => { document.body.innerText += text + '\n'; }
                });
        </script>
</body>
</html>
EOL
$ ./emrun out/index.html

Failure from browser console:

Failed to load resource: the server responded with a status of 404 (File not found: <current path>/out/hello.data)

Module hello.mjs search hello.data in out subdirectory (local webserver root). But hello.mjs sould search hello.data from ./static/ supdirecotry where hello.mjs hosted himself.

Then we mode hello.data to out from out/static and run again:

$ mv out/static/hello.data out/
$ ./emrun out/index.html

And see text in browser:

==
This data has been read from a file.
The file is readable as if it were at the same location in the filesystem, including directories, as in the local filesystem where you compiled the source.
==
@sbc100
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sbc100 commented Mar 19, 2025

Indeed it looks like we should loading the preload data file relative to the .mjs files by default.

BTW, have you considered switching from --preload-file to --embind-file the later will embed the data directly into the wasm file saving download size and memory copying.

@podsvirov
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Sounds good, but where I can read about the --embind-file option more?

@sbc100
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sbc100 commented Mar 19, 2025

https://emscripten.org/docs/porting/files/packaging_files.html#packaging-using-emcc

@podsvirov
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https://emscripten.org/docs/porting/files/packaging_files.html#packaging-using-emcc

Thanks! Will try it.

@podsvirov
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BTW, have you considered switching from --preload-file to --embind-file the later will embed the data directly into the wasm file saving download size and memory copying.

Oh, looks like we was speak about the --embed-file option! 😄

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