small performance improvements

src/lib.rs

@@ -1,6 +1,6 @@
 use winapi::um::winuser::GetKeyNameTextW;
 use std::ffi::OsString;
-use wio::wide::FromWide;
+use wio::wide::{FromWide, ToWide};
 
 pub mod logger;
 
@@ -9,6 +9,8 @@ pub fn scan_code_to_key_name(scan_code: u32) -> String {
     unsafe {
         let mut out = [0u16; 128];
         GetKeyNameTextW((scan_code << 16) as i32, (&mut out).as_mut_ptr(), 128);
-        OsString::from_wide(&out).to_str().unwrap().replace('\0', "")
+        let null_pos = out.iter().position(|x| *x == b'\0' as u16).unwrap_or_else(|| out.len());
+        //use to_string_lossy to avoid unicode checks for better performance. if the windows api screws up thats not my fault :P
+        OsString::from_wide(&out[..null_pos]).to_string_lossy().into()
     }
 }