Crate w32_error

w32-error

w32-error provides the W32Error type for wrapping Windows API error codes. A W32Error has the same layout as a DWORD, and implements Display for printing human-readable error messages. When the std crate feature is enabled, W32Error also implements Error, and can be converted to or from an io::Error via the standard TryFrom/TryInto (io::Error => W32Error) and From/Into (W32Error => io::Error) traits.

Examples

A W32Error can be constructed from an arbitrary DWORD:

use w32_error::W32Error;

fn main() -> Result<(), W32Error> {
    Err(W32Error::new(0))
}

The W32Error::last_thread_error method constructs a W32Error using the last-error code set for the calling thread:

use std::io;
use w32_error::W32Error;

fn windows_api_call() -> Result<(), W32Error> {
    let result = SomeWindowsAPIFunction();
    if result == 0 { // Zero indicates failure.
        Err(W32Error::last_thread_error())
    } else {
        // ...
    }
}

fn main() -> io::Result<()> {
    windows_api_call()?; // Converts `W32Error` to `io::Error` on failure.
    Ok(())
}

W32Error implements Display via calling FormatMessageW:

use w32_error::W32Error;

fn main() {
    let error = W32Error::new(0);
    println!("{}", error);
}

Structs

TryFromIoError	A failure to convert an io::Error into a W32Error.
W32Error	A Windows API error.