47 lines
1.5 KiB
Rust
47 lines
1.5 KiB
Rust
//! Win32 utility functions.
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use std::ffi::OsStr;
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#[cfg(target_os = "windows")]
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use std::os::windows::ffi::OsStrExt;
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use windows_sys::Win32::Foundation::{LocalFree, HLOCAL};
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use windows_sys::Win32::System::Diagnostics::Debug::{
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FormatMessageW, FORMAT_MESSAGE_ALLOCATE_BUFFER, FORMAT_MESSAGE_FROM_SYSTEM,
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FORMAT_MESSAGE_IGNORE_INSERTS,
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};
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/// Convert an OsStr to a null-terminated wide string (LPWSTR).
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#[cfg(target_os = "windows")]
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pub fn to_wide<S: AsRef<OsStr>>(s: S) -> Vec<u16> {
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let mut v: Vec<u16> = s.as_ref().encode_wide().collect();
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v.push(0);
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v
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}
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/// Produce a readable description for a Win32 error code.
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#[cfg(target_os = "windows")]
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pub fn format_last_error(err: i32) -> String {
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unsafe {
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let mut buf_ptr: *mut u16 = std::ptr::null_mut();
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let flags = FORMAT_MESSAGE_ALLOCATE_BUFFER
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| FORMAT_MESSAGE_FROM_SYSTEM
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| FORMAT_MESSAGE_IGNORE_INSERTS;
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let len = FormatMessageW(
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flags,
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std::ptr::null(),
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err as u32,
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0,
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(&mut buf_ptr as *mut *mut u16) as *mut u16,
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0,
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std::ptr::null_mut(),
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);
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if len == 0 || buf_ptr.is_null() {
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return format!("Win32 error {}", err);
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}
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let slice = std::slice::from_raw_parts(buf_ptr, len as usize);
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let mut s = String::from_utf16_lossy(slice);
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s = s.trim().to_string();
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let _ = LocalFree(buf_ptr as HLOCAL);
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s
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}
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}
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