struct bool emit MarshalAs

csbindgen-tests/src/lib.rs

@@ -1,5 +1,3 @@
-use std::io::Bytes;
-
 #[allow(dead_code)]
 #[allow(non_snake_case)]
 #[allow(non_camel_case_types)]
@@ -34,15 +32,15 @@ pub extern "C" fn my_bool(
     true
 }
 
-#[no_mangle]
-pub unsafe extern "C" fn new(x: *mut *mut Vec<u8>) {
-    let v = Box::new(Vec::new());
-    *x = Box::into_raw(v);
-}
+// #[no_mangle]
+// pub unsafe extern "C" fn new(x: *mut *mut Vec<u8>) {
+//     let v = Box::new(Vec::new());
+//     *x = Box::into_raw(v);
+// }
 
 #[no_mangle]
 pub unsafe extern "C" fn unsafe_return_string() -> *const u8 {
-todo!();
+    todo!();
 }
 
 #[no_mangle]
@@ -55,6 +53,23 @@ pub extern "C" fn unsafe_destroy_string(s: *mut String) {
     unsafe { Box::from_raw(s) };
 }
 
+#[no_mangle]
+pub extern "C" fn create_context() -> *mut Context {
+    let ctx = Box::new(Context { foo: true });
+    Box::into_raw(ctx)
+}
+
+#[no_mangle]
+pub extern "C" fn delete_context(context: *mut Context) {
+    unsafe { Box::from_raw(context) };
+}
+
+#[repr(C)]
+#[derive(Debug, Copy, Clone)]
+pub struct Context {
+    pub foo: bool,
+}
+
 #[test]
 fn build_test() {
     // let path = std::env::current_dir().unwrap();

csbindgen/src/emitter.rs

@@ -154,20 +154,22 @@ pub fn emit_csharp(
 
         structs_string
             .push_str_ln(format!("    [StructLayout(LayoutKind.{layout_kind})]").as_str());
-        structs_string.push_str_ln(format!("    public unsafe struct {name}").as_str());
+        structs_string.push_str_ln(format!("    {accessibility} unsafe struct {name}").as_str());
         structs_string.push_str_ln("    {");
         for field in &item.fields {
             if item.is_union {
                 structs_string.push_str_ln("        [FieldOffset(0)]");
             }
-            structs_string.push_str(
-                format!(
-                    "        public {} {}",
-                    field.rust_type.to_csharp_string(options, aliases),
-                    field.name
-                )
-                .as_str(),
-            );
+
+            let type_name = field.rust_type.to_csharp_string(options, aliases);
+            let attr = if type_name == "bool" {
+                "[MarshalAs(UnmanagedType.U1)] ".to_string()
+            } else {
+                "".to_string()
+            };
+
+            structs_string
+                .push_str(format!("        {}public {} {}", attr, type_name, field.name).as_str());
             if field.rust_type.is_fixed_array {
                 let mut digits = field.rust_type.fixed_array_digits.clone();
                 if digits == "0" {

dotnet-sandbox/method_call.cs

@@ -27,7 +27,19 @@ namespace CsBindgen
         [DllImport(__DllName, EntryPoint = "unsafe_destroy_string", CallingConvention = CallingConvention.Cdecl)]
         public static extern void unsafe_destroy_string(String* s);
 
+        [DllImport(__DllName, EntryPoint = "create_context", CallingConvention = CallingConvention.Cdecl)]
+        public static extern Context* create_context();
 
+        [DllImport(__DllName, EntryPoint = "delete_context", CallingConvention = CallingConvention.Cdecl)]
+        public static extern void delete_context(Context* context);
+
+
+    }
+
+    [StructLayout(LayoutKind.Sequential)]
+    internal unsafe struct Context
+    {
+        [MarshalAs(UnmanagedType.U1)] public bool foo;
     }