Created
July 18, 2018 18:30
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Standard stdout on windows is really slow. Instead, getting a handle to the CONOUT$ and writing to it, can increase the speed a LOT.
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[package] | |
name = "rustfastcmd" | |
version = "0.1.0" | |
authors = ["Pablo Ordoñez <pabloo84@gmail.com>"] | |
[dependencies] | |
[target.'cfg(windows)'.dependencies] | |
winapi = { version = "0.3", features = ["winuser", "wincon", "fileapi", "handleapi"] } |
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extern crate winapi; | |
use winapi::um::fileapi::CreateFileW; | |
use winapi::um::handleapi::CloseHandle; | |
use winapi::um::wincon::{WriteConsoleOutputCharacterW, COORD}; | |
use std::ptr::null_mut; | |
use std::time::{Duration, Instant}; | |
fn get_wstring(msg: &str) -> Vec<u16> { | |
use std::ffi::OsStr; | |
use std::iter::once; | |
use std::os::windows::ffi::OsStrExt; | |
OsStr::new(msg).encode_wide().chain(once(0)).collect() | |
} | |
fn main() { | |
let console_handle = unsafe { | |
CreateFileW( | |
get_wstring("CONOUT$").as_ptr(), | |
0x40000000, | |
2, | |
null_mut(), | |
3, | |
0, | |
null_mut(), | |
) | |
}; | |
println!("{:?}", console_handle); | |
let raw_message = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"; | |
let mut fps_text = String::from("FPS: 0") + &raw_message; | |
let mut chars: u32 = 0; | |
let mut fps = 0; | |
let mut duration = Duration::from_micros(0); | |
loop { | |
fps += 1; | |
let now = Instant::now(); | |
unsafe { | |
WriteConsoleOutputCharacterW( | |
console_handle, | |
get_wstring(&fps_text).as_ptr(), | |
raw_message.len() as u32, | |
COORD { X: 0, Y: 0 }, | |
&mut chars as *mut u32, | |
) | |
}; | |
duration += now.elapsed(); | |
if duration.as_secs() > 1 { | |
duration = Duration::from_micros(0); | |
fps_text = String::from("FPS: ") + &fps.to_string() + &raw_message; | |
fps = 0; | |
} | |
} | |
unsafe { CloseHandle(console_handle) }; | |
} |
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