OSError: error 0xc1 unable to load .pyd file on windows

[hpca01]

Hi, I keep getting the following error:

error 0xc1  cannot load library 'C:\Users\a11123434\projects\venv\Lib\site-packages\xlsbconvert-0.0.1-py3.6-win32.egg\xlsbconvert\_native__lib.cp36-win32.pyd': error 0xc1

my setup.py:

from setuptools import setup

def build_native(spec):
    # build an example rust library
    build = spec.add_external_build(
        cmd=['cargo', 'build', '--release'],
        path='.'
    )

    spec.add_cffi_module(
        module_path='xlsb_csv._native',
        dylib=lambda: build.find_dylib('xlsb_csv', in_path='target/release'),
        header_filename=lambda: build.find_header('xlsb_csv.h', in_path='target'),
        rtld_flags=['NOW', 'NODELETE']
    )

setup(
    name='xlsb_csv',
    version='0.0.1',
    packages=['xlsb_csv'],
    zip_safe=False,
    platforms='any',
    setup_requires=['milksnake'],
    install_requires=['milksnake'],
    milksnake_tasks=[
        build_native
    ]
)

my cargo.toml:

[package]
name = "xlsb_csv"
version = "0.1.0"
authors = ["a random person [email protected]"]
edition = "2018"
build = "build.rs"

[lib]
name = "xlsb_csv"
path = "src/lib.rs"
crate-type=["cdylib"]

[dependencies]
calamine = "0.15.5"
csv = "1.1.1"

[build-dependencies]
cbindgen="0.9.0"

lib.rs:

#[no_mangle]
pub unsafe extern "C" fn a_test()->String{
    return String::from("abc")
}

xlsb_csv/init.py:

from xlsb_csv._native import ffi, lib

def test():
    return lib.a_test()

build.rs:

extern crate cbindgen;

use std::env;

fn main() {
    let crate_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
    let mut config: cbindgen::Config = Default::default();
    config.language = cbindgen::Language::C;
    cbindgen::generate_with_config(&crate_dir, config)
      .unwrap()
      .write_to_file("target/xlsb_csv.h");
}

folder structure:

• xlsb_csv\ __init__.py
• src\lib.rs
• cargo.toml
• build.rs
• setup.py

[hpca01]

fixed the ModuleNotFound error. Now I have a different error:
cannot load library '\venv\Lib\site-packages\xlsb_csv-0.0.1-py3.6-win32.egg\xlsb_csv\_native__lib.cp36-win32.pyd': error 0xc1

[hpca01]

Figured it out, had to change the rust toolchain because I have multiple versions of python installed(32bit vs 64bit). THANKS!

[exarkun]

It would be pretty cool to have more details about what those changes were for anyone who runs into this problem and is looking for the workaround.