Windows error handling

The windows-result crate provides efficient Windows error handling and propagation with support for Win32, COM, and WinRT APIs.

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Start by adding the following to your Cargo.toml file:

[dependencies.windows-result]
version = "0.1"

Use the HRESULT, Error, and specialized Result types as needed:

use windows_result::*;

const S_OK: HRESULT = HRESULT(0);
const ERROR_CANCELLED: u32 = 1223;
const E_CANCELLED: HRESULT = HRESULT::from_win32(ERROR_CANCELLED);

fn main() -> Result<()> {
    S_OK.ok()?;
    let e = Error::new(E_CANCELLED, "test message");
    assert_eq!(e.code(), E_CANCELLED);
    assert_eq!(e.message(), "test message");
    Ok(())
}