fix!: windows compilation

Cargo.toml

@@ -28,6 +28,8 @@ default = [ "half", "fetch-models", "copy-dylibs" ]
 # used to prevent issues with docs.rs
 disable-build-script = []
 
+profiling = [ "widestring" ]
+
 fetch-models = [ "ureq" ]
 generate-bindings = [ "bindgen" ]
 copy-dylibs = []
@@ -76,6 +78,7 @@ libc = "0.2"
 
 [target.'cfg(windows)'.dependencies]
 winapi = { version = "0.3", features = [ "std", "libloaderapi" ] }
+widestring = { version = "1.0", optional = true }
 
 [dev-dependencies]
 ureq = "2.1"

src/error.rs

@@ -99,9 +99,13 @@ pub enum OrtError {
 		/// Path with invalid UTF-8
 		path: PathBuf
 	},
-	/// Attempt to build a Rust `CString` from a null pointer
+	/// Attempt to build a Rust `CString` when the original string contains a null character.
 	#[error("Failed to build CString when original contains null: {0}")]
 	FfiStringNull(#[from] std::ffi::NulError),
+	/// Attempt to build a `WideCString` when the original string contains a null character.
+	#[cfg(all(windows, feature = "profiling"))]
+	#[error("Failed to build CString when original contains null: {0}")]
+	WideFfiStringNull(#[from] widestring::error::ContainsNul<u16>),
 	#[error("{0} pointer should be null")]
 	/// ORT pointer should have been null
 	PointerShouldBeNull(String),

src/session.rs

@@ -204,7 +204,11 @@ impl SessionBuilder {
 
 	/// Enables profiling. Profile information will be writen to `profiling_file` after profiling completes.
 	/// See `Session::end_profiling`.
+	#[cfg(feature = "profiling")]
 	pub fn with_profiling<S: AsRef<str>>(self, profiling_file: S) -> OrtResult<Self> {
+		#[cfg(windows)]
+		let profiling_file = widestring::WideCString::from_str(profiling_file.as_ref())?;
+		#[cfg(not(windows))]
 		let profiling_file = CString::new(profiling_file.as_ref())?;
 		ortsys![unsafe EnableProfiling(self.session_options_ptr, profiling_file.as_ptr()) -> OrtError::CreateSessionOptions];
 		Ok(self)
@@ -626,6 +630,7 @@ impl Session {
 
 	/// Ends profiling for this session. Note that this must be explicitly called at the end of profiling, otherwise
 	/// the profiing file will be empty.
+	#[cfg(feature = "profiling")]
 	pub fn end_profiling(&self) -> OrtResult<String> {
 		let mut profiling_name: *mut c_char = std::ptr::null_mut();