Add tests for out struct (#53)

Author: kant2002

WinFormsComInterop.SourceGenerator.Tests/ComCallableWrapperTest.cs

@@ -1616,6 +1616,154 @@ public static int CopyTo(System.IntPtr thisPtr, System.IntPtr* pstm, ulong cb)
             Assert.AreEqual(expectedOutput, output);
         }
 
+        [TestMethod]
+        public void StructOutParameter()
+        {
+            string source = @"
+namespace Foo
+{
+    using System.Threading;
+    using System.Runtime.InteropServices;
+
+    public enum EnumType
+    {
+    }
+
+    public struct STATSTG
+    {
+        public object VariantValue;
+        [MarshalAs(UnmanagedType.IUnknown)]
+        public object UnknownValue;
+        public EnumType EnumValue;
+    }
+
+    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+    public interface IStr
+    {
+        void CopyTo(out STATSTG pstm);
+    }
+
+    [ComCallableWrapper(typeof(IStr))]
+    partial class C
+    {
+    }
+}";
+            string output = this.GetGeneratedOutput(source, NullableContextOptions.Disable);
+
+            Assert.IsNotNull(output);
+
+            var expectedOutput = @"// <auto-generated>
+// Code generated by COM Proxy Code Generator.
+// Changes may cause incorrect behavior and will be lost if the code is
+// regenerated.
+// </auto-generated>
+#nullable enable
+using ComInterfaceDispatch = System.Runtime.InteropServices.ComWrappers.ComInterfaceDispatch;
+using Marshal = System.Runtime.InteropServices.Marshal;
+
+namespace Foo
+{
+    [System.Runtime.Versioning.SupportedOSPlatform(""windows"")]
+    unsafe partial class IStrProxy
+    {
+        [System.Runtime.InteropServices.UnmanagedCallersOnly]
+        public static int CopyTo(System.IntPtr thisPtr, STATSTG_native* pstm)
+        {
+            try
+            {
+                var inst = ComInterfaceDispatch.GetInstance<global::Foo.IStr>((ComInterfaceDispatch*)thisPtr);
+                global::Foo.STATSTG local_0;
+                inst.CopyTo(out local_0);
+                var local_0_VariantValue = local_0.VariantValue;
+                WinFormsComInterop.InteropServices.Variant local_0_0 = new WinFormsComInterop.InteropServices.Variant();
+                Marshal.GetNativeVariantForObject(local_0_VariantValue, (System.IntPtr)(WinFormsComInterop.InteropServices.Variant*)&local_0_0);
+                pstm->VariantValue = local_0_0;
+                var local_0_UnknownValue = local_0.UnknownValue;
+                var local_0_1 = local_0_UnknownValue == null ? System.IntPtr.Zero : global::Foo.MarshalSupport.GetIUnknownForObject(local_0_UnknownValue);
+                pstm->UnknownValue = local_0_1;
+                var local_0_EnumValue = local_0.EnumValue;
+                int local_0_2;
+                pstm->EnumValue = local_0_EnumValue;
+            }
+            catch (System.Exception __e)
+            {
+                return __e.HResult;
+            }
+
+            return 0; // S_OK;
+        }
+    }
+}";
+            Assert.AreEqual(expectedOutput, output);
+        }
+
+        [TestMethod]
+        public void StructSTGMEDIUMOutParameter()
+        {
+            string source = @"
+namespace Foo
+{
+    using System.Threading;
+    using System.Runtime.InteropServices;
+
+    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+    public interface IStr
+    {
+        void CopyTo(out System.Runtime.InteropServices.ComTypes.STGMEDIUM pstm);
+    }
+
+    [ComCallableWrapper(typeof(IStr))]
+    partial class C
+    {
+    }
+}";
+            string output = this.GetGeneratedOutput(source, NullableContextOptions.Disable);
+
+            Assert.IsNotNull(output);
+
+            var expectedOutput = @"// <auto-generated>
+// Code generated by COM Proxy Code Generator.
+// Changes may cause incorrect behavior and will be lost if the code is
+// regenerated.
+// </auto-generated>
+#nullable enable
+using ComInterfaceDispatch = System.Runtime.InteropServices.ComWrappers.ComInterfaceDispatch;
+using Marshal = System.Runtime.InteropServices.Marshal;
+
+namespace Foo
+{
+    [System.Runtime.Versioning.SupportedOSPlatform(""windows"")]
+    unsafe partial class IStrProxy
+    {
+        [System.Runtime.InteropServices.UnmanagedCallersOnly]
+        public static int CopyTo(System.IntPtr thisPtr, STGMEDIUM_native* pstm)
+        {
+            try
+            {
+                var inst = ComInterfaceDispatch.GetInstance<global::Foo.IStr>((ComInterfaceDispatch*)thisPtr);
+                global::System.Runtime.InteropServices.ComTypes.STGMEDIUM local_0;
+                inst.CopyTo(out local_0);
+                var local_0_tymed = local_0.tymed;
+                int local_0_0;
+                pstm->tymed = local_0_tymed;
+                var local_0_unionmember = local_0.unionmember;
+                pstm->unionmember = local_0_unionmember;
+                var local_0_pUnkForRelease = local_0.pUnkForRelease;
+                var local_0_2 = local_0_pUnkForRelease == null ? System.IntPtr.Zero : global::Foo.MarshalSupport.GetIUnknownForObject(local_0_pUnkForRelease);
+                pstm->pUnkForRelease = local_0_2;
+            }
+            catch (System.Exception __e)
+            {
+                return __e.HResult;
+            }
+
+            return 0; // S_OK;
+        }
+    }
+}";
+            Assert.AreEqual(expectedOutput, output);
+        }
+
         [TestMethod]
         public void VariantOutParameter()
         {