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use std::io::{self, Write};
use std::ptr;
use windows_sys::Win32::Foundation::HANDLE;
use windows_sys::Win32::System::Console::{
GetConsoleMode, ReadConsoleW, SetConsoleMode, GetStdHandle, STD_INPUT_HANDLE,
ENABLE_ECHO_INPUT, ENABLE_LINE_INPUT,
};
fn main() -> io::Result<()> {
unsafe {
let h: HANDLE = GetStdHandle(STD_INPUT_HANDLE);
if h == std::ptr::null_mut() || h == -1_i32 as HANDLE { return Err(io::Error::last_os_error()); }
// save current mode
let mut mode: u32 = 0;
if GetConsoleMode(h, &mut mode) == 0 { return Err(io::Error::last_os_error()); }
// disable line input and echo so input is available per-key and not echoed
let new_mode = mode & !(ENABLE_LINE_INPUT | ENABLE_ECHO_INPUT);
if SetConsoleMode(h, new_mode) == 0 { return Err(io::Error::last_os_error()); }
print!("Press keys (q to exit): ");
io::stdout().flush()?;
// ReadConsoleW reads UTF-16; we'll read one wchar at a time
let mut buf: [u16; 1] = [0];
loop {
let mut read = 0u32;
if ReadConsoleW(
h,
buf.as_mut_ptr() as *mut _,
1,
&mut read,
ptr::null_mut(),
) == 0
{
// restore mode on error before returning
let _ = SetConsoleMode(h, mode);
return Err(io::Error::last_os_error());
}
let ch = std::char::from_u32(buf[0] as u32).unwrap_or('\u{FFFD}');
if ch == 'q' { break; } // q to exit
// handle Enter (CR) so output is readable
if ch == '\r' {
println!();
} else {
// show code point (no automatic console echo)
print!("[{:?}]", ch);
io::stdout().flush()?;
}
}
// restore original console mode
let _ = SetConsoleMode(h, mode);
println!("\nexited");
}
Ok(())
}
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