decoding input events

Cargo.lock

@@ -2,10 +2,73 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "anyhow"
+version = "1.0.69"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "224afbd727c3d6e4b90103ece64b8d1b67fbb1973b1046c2281eed3f3803f800"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.51"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d727cae5b39d21da60fa540906919ad737832fe0b1c165da3a34d6548c849d6"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8856d8364d252a14d474036ea1358d63c9e6965c8e5c1885c18f73d70bff9c7b"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.107"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1f4064b5b16e03ae50984a5a8ed5d4f8803e6bc1fd170a3cda91a1be4b18e3f5"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "thiserror"
+version = "1.0.38"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a9cd18aa97d5c45c6603caea1da6628790b37f7a34b6ca89522331c5180fed0"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.38"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1fb327af4685e4d03fa8cbcf1716380da910eeb2bb8be417e7f9fd3fb164f36f"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "84a22b9f218b40614adcb3f4ff08b703773ad44fa9423e4e0d346d5db86e4ebc"
+
 [[package]]
 name = "wash"
 version = "0.1.0"
 dependencies = [
+ "anyhow",
+ "thiserror",
  "windows",
 ]
 

Cargo.toml

@@ -6,6 +6,8 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+anyhow = "1.0"
+thiserror = "1.0"
 
 [dependencies.windows]
 version = "0.44.0"

src/error.rs

@@ -0,0 +1,22 @@
+use thiserror::Error;
+use windows::Win32::Foundation::{GetLastError, BOOL};
+
+#[derive(Error, Debug)]
+pub enum Error {
+    #[error("windows error: {0}")]
+    WindowsError(String),
+}
+
+impl Error {
+    pub fn last_error() -> Self {
+        unsafe { Error::WindowsError(GetLastError().to_hresult().message().to_string()) }
+    }
+
+    pub fn check(b: BOOL) -> Result<(), Self> {
+        if b.as_bool() {
+            Ok(())
+        } else {
+            Err(Error::last_error())
+        }
+    }
+}

src/main.rs

@@ -1,6 +1,11 @@
-use std::io;
+mod error;
-use std::io::Write;
+
-use windows::Win32::{Foundation::GetLastError, System::Console};
+use std::io::{self, Write};
+use windows::Win32::{Foundation::HANDLE, System::Console};
+
+use anyhow::{Context, Result};
+
+use crate::error::Error;
 
 fn print_input_mode(mode: Console::CONSOLE_MODE) {
     // Characters read by the ReadFile or ReadConsole function are written to the active screen
@@ -171,56 +176,130 @@ fn print_output_mode(mode: Console::CONSOLE_MODE) {
     }
 }
 
-fn main() {
+fn stdin_handle() -> Result<HANDLE> {
-    let mut stdout = io::stdout();
+    unsafe {
+        let handle = Console::GetStdHandle(Console::STD_INPUT_HANDLE)
+            .context("unable to get stdin handle")?;
+        Ok(handle)
+    }
+}
 
+fn stdout_handle() -> Result<HANDLE> {
+    unsafe {
+        let handle = Console::GetStdHandle(Console::STD_OUTPUT_HANDLE)
+            .context("unable to get stdin handle")?;
+        Ok(handle)
+    }
+}
+
+fn setup_stdin() -> Result<()> {
     let mut mode = Console::CONSOLE_MODE(0);
     unsafe {
-        let handle = Console::GetStdHandle(Console::STD_INPUT_HANDLE).unwrap();
+        let handle = stdin_handle()?;
-        if Console::GetConsoleMode(handle, &mut mode).as_bool() {
+        Error::check(Console::GetConsoleMode(handle, &mut mode))?;
-            println!("Stdin details:");
+        println!("Stdin details:");
-            print_input_mode(mode);
+        print_input_mode(mode);
-        } else {
+
-            let err = GetLastError();
+        // allow terminal input characters
-            println!(
+        mode |= Console::ENABLE_VIRTUAL_TERMINAL_INPUT;
-                "Unable to get console mode: {:?}",
+
-                err.to_hresult().message()
+        // disable automatic processing of CTRL+C, we'll handle it ourselves
-            );
+        mode &= !Console::ENABLE_PROCESSED_INPUT;
-        }
 
-        let handle = Console::GetStdHandle(Console::STD_OUTPUT_HANDLE).unwrap();
+        // disable line mode to get every input as its pressed
+        mode &= !Console::ENABLE_LINE_INPUT;
+
+        // disable automatic echoing of inputs
+        mode &= !Console::ENABLE_ECHO_INPUT;
+
+        // enable mouse input
+        mode |= Console::ENABLE_MOUSE_INPUT;
+
+        Error::check(Console::SetConsoleMode(handle, mode))?;
+    }
+    Ok(())
+}
+
+fn setup_stdout() -> Result<()> {
+    let mut mode = Console::CONSOLE_MODE(0);
+    unsafe {
+        let handle = stdout_handle()?;
         if Console::GetConsoleMode(handle, &mut mode).as_bool() {
             println!("Stdout details:");
             print_output_mode(mode);
         } else {
-            let err = GetLastError();
+            return Err(Error::last_error().into());
-            println!(
-                "Unable to get console mode: {:?}",
-                err.to_hresult().message()
-            );
         }
     }
+    Ok(())
+}
+
+fn main() -> Result<()> {
+    setup_stdin()?;
+    setup_stdout()?;
 
-    let stdin = io::stdin();
+    let stdin = stdin_handle()?;
-    let mut line = String::new();
+    let mut buf = [Console::INPUT_RECORD::default(); 100];
     loop {
-        if let Err(_) = stdout.write(b"> ") {
+        let mut n: u32 = 0;
-            break;
+        unsafe {
+            Error::check(Console::ReadConsoleInputA(stdin, &mut buf, &mut n))?;
         }
-        if let Err(_) = stdout.flush() {
+        let n = n as usize;
-            break;
+        println!("read: {:?}", n);
-        }
+        for rec in &buf[0..n] {
-        match stdin.read_line(&mut line) {
+            println!("Event Type: {}", rec.EventType);
-            Ok(_) => {
+            match rec.EventType as u32 {
-                if let Err(_) = stdout.write(
+                Console::FOCUS_EVENT => {
-                    String::from("\u{001b}[31m ok \u{001b}[0m\n")
+                    // The Event member contains a FOCUS_EVENT_RECORD structure. These events are
-                        .as_str()
+                    // used internally and should be ignored.
-                        .as_bytes(),
+                    unsafe {
-                ) {
+                        let event = rec.Event.FocusEvent;
-                    break;
+                        println!("Focus Event: {:?}", event);
+                    }
+                }
+                Console::MENU_EVENT => {
+                    // The Event member contains a MENU_EVENT_RECORD structure. These events are
+                    // used internally and should be ignored.
+                    unsafe {
+                        let event = rec.Event.MenuEvent;
+                        println!("Menu Event: {:?}", event);
+                    }
+                }
+                Console::KEY_EVENT => {
+                    // The Event member contains a KEY_EVENT_RECORD structure with information
+                    // about a keyboard event.
+                    unsafe {
+                        let event = rec.Event.KeyEvent;
+                        let down = event.bKeyDown;
+                        let repeats = event.wRepeatCount;
+                        let key_code = event.wVirtualKeyCode;
+                        let scan_code = event.wVirtualScanCode;
+                        let c = event.uChar.UnicodeChar;
+                        let modifiers = event.dwControlKeyState;
+                        println!(
+                            "Key Event: down: {down:?} repeats: {repeats} key-code: {key_code} scan-code: {scan_code} char: {c} modifiers: {modifiers}"
+                        );
+                    }
+                }
+                Console::MOUSE_EVENT => {
+                    // The Event member contains a MOUSE_EVENT_RECORD structure with information
+                    // about a mouse movement or button press event.
+                    unsafe {
+                        let event = rec.Event.MouseEvent;
+                        println!("Mouse Event: {:?}", event);
+                    }
+                }
+                Console::WINDOW_BUFFER_SIZE_EVENT => {
+                    // The Event member contains a WINDOW_BUFFER_SIZE_RECORD structure with
+                    // information about the new size of the console screen buffer.
+                    unsafe {
+                        let event = rec.Event.WindowBufferSizeEvent;
+                        println!("Window Buffer Event: {:?}", event);
+                    }
                 }
+                _ => {}
             }
-            Err(_) => break,
         }
     }
 }