Can not work on Windows

[MountainAndMorning]

I followed the hello world example on Windows 10. node -v v18.16.0 npm -v 9.5.1

npm init neon cpu-count

cd cpu-count
npm install

node
require('.')

But got the error below:

(base) C:\Users\iridium\Documents\cpu-count>node Welcome to Node.js v18.16.0. Type ".help" for more information.

req Request require

require('.') Uncaught: Error: \?\C:\Users\iridium\Documents\cpu-count\index.node is not a valid Win32 application. \?\C:\Users\iridium\Documents\cpu-count\index.node at Module._extensions..node (node:internal/modules/cjs/loader:1338:18) at Module.load (node:internal/modules/cjs/loader:1117:32) at Module._load (node:internal/modules/cjs/loader:958:12) at Module.require (node:internal/modules/cjs/loader:1141:19) at require (node:internal/modules/cjs/helpers:110:18) { code: 'ERR_DLOPEN_FAILED' }

I also try use the node-v14.16.0-x64 and the node-v16.13.0-x64 and also failed.

[kjvalencik]

What version of Windows? What CPU architecture? Can you double check your default cargo target (rustup default)?

It seems like the module isn't targeting Windows.

[MountainAndMorning]

Thanks for your help. Windows 10 version 21H2 AMD Ryzen Threadripper 3970X 32-Core I solved the problem by deleting the rust installed by the rust-1.70,0-i686-pc-windows-gpu installer and reinstall the rust by the rustup-init installer.

[jdms754]

Running into the same error. I am able to build and run another rust executable successfully.

Error: \\?\C:\Users\korolev\cpu-count\index.node is not a valid Win32 application.
\\?\C:\Users\korolev\cpu-count\index.node
    at Module._extensions..node (node:internal/modules/cjs/loader:1340:18)
    at Module.load (node:internal/modules/cjs/loader:1119:32)
    at Module._load (node:internal/modules/cjs/loader:960:12)
    at Module.require (node:internal/modules/cjs/loader:1143:19)
    at require (node:internal/modules/cjs/helpers:110:18) {
  code: 'ERR_DLOPEN_FAILED'
}

rustup show returns

PS C:\Users\korolev\cpu-count> rustup show
Default host: aarch64-pc-windows-msvc
rustup home:  C:\Users\korolev\.rustup

stable-aarch64-pc-windows-msvc (default)
rustc 1.80.1 (3f5fd8dd4 2024-08-06)

Running Windows 11 Pro on Parallels (Apple Silicon 3.20 GHz (6 processors)) with Node v18.16.1 x64

edit: switching rustup default toolchain to stable-x86_64-pc-windows-msvc seems to fix the issue

[kjvalencik]

@jdms754 That seems sounds like x86 Windows is being run and not ARM. This would be expected.

FYI, Neon does not do any special building. A Node native addon is a standard C-dynamic library (cdylib in Rust). Node loads the shared library with dlopen like the OS would for any other shared library and looks for a symbol (function) with the name napi_register_module_v1. That's what #[neon::main] generates.

I'm going to close this issue since it's highly likely any similar issues are related to misconfigured Rust toolchain and not Neon.