Add winapi to do another cast

examples/Cargo.lock

@@ -5,6 +5,7 @@ dependencies = [
  "ash 0.2.0",
  "image 0.10.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "user32-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "winit 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 

examples/Cargo.toml

@@ -10,3 +10,4 @@ ash = { version = "*", path = "../"}
 
 [target.'cfg(windows)'.dependencies]
 user32-sys = "0.2.0"
+winapi = "0.2.8"

examples/src/lib.rs

@@ -4,6 +4,8 @@ extern crate ash;
 extern crate winit;
 #[cfg(windows)]
 extern crate user32;
+#[cfg(windows)]
+extern crate winapi;
 
 use ash::vk;
 use std::default::Default;
@@ -101,14 +103,14 @@ fn create_surface(instance: &Instance,
                   window: &winit::Window)
                   -> Result<vk::SurfaceKHR, vk::Result> {
     use winit::os::windows::WindowExt;
-    let hwnd = window.get_hwnd() as *const ();
+    let hwnd = window.get_hwnd() as *mut winapi::windef::HWND__;
     let hinstance = user32::GetWindow(hwnd, 0) as *const ();
     let win32_create_info = vk::Win32SurfaceCreateInfoKHR {
         s_type: vk::StructureType::Win32SurfaceCreateInfoKhr,
         p_next: ptr::null(),
         flags: Default::default(),
         hinstance: hinstance,
-        hwnd: hwnd,
+        hwnd: hwnd as *const (),
     };
     let win32_surface_loader = Win32Surface::new(&entry, &instance)
         .expect("Unable to load win32 surface");