Fix the sample app.

Author: thejpster

samples/hello/src/main.rs

@@ -5,8 +5,8 @@ extern crate neotron_sdk;
 
 #[no_mangle]
 extern "C" fn main() -> i32 {
-    let stdout = neotron_sdk::FileHandle::new_stdout();
-    neotron_sdk::write(stdout, b"Hello, world\n");
+    let stdout = neotron_sdk::stdout();
+    stdout.write(b"Hello, world\n").unwrap();
     0
 }
 

src/lib.rs

@@ -282,6 +282,21 @@ pub fn free(_ptr: *mut core::ffi::c_void, _size: usize, _alignment: usize) {
     todo!()
 }
 
+/// Get a handle for Standard Input
+pub fn stdin() -> File {
+    File(file::Handle::new_stdin())
+}
+
+/// Get a handle for Standard Output
+pub fn stdout() -> File {
+    File(file::Handle::new_stdout())
+}
+
+/// Get a handle for Standard Error
+pub fn stderr() -> File {
+    File(file::Handle::new_stderr())
+}
+
 /// Get the API structure so we can call APIs manually.
 ///
 /// If you managed to not have `app_entry` called on start-up, this will panic.