Marshal callback as function pointer.

dahall · Feb 9, 2021 · d904144 · d904144
1 parent cc4973b
commit d904144
Showing 1 changed file with 7 additions and 2 deletions.
diff --git a/PInvoke/Ole/Ole32/CtxtCall.cs b/PInvoke/Ole/Ole32/CtxtCall.cs
@@ -50,7 +50,12 @@ public interface IContextCallback
 			/// </remarks>
 			// https://docs.microsoft.com/en-us/windows/win32/api/ctxtcall/nf-ctxtcall-icontextcallback-contextcallback
 			[PreserveSig]
-			HRESULT ContextCallback(PFNCONTEXTCALL pfnCallback, in ComCallData pParam, in Guid riid, int iMethod, [In, Optional] IntPtr pUnk);
+			HRESULT ContextCallback(
+				[MarshalAs(UnmanagedType.FunctionPtr)] PFNCONTEXTCALL pfnCallback,
+				in ComCallData pParam,
+				in Guid riid,
+				int iMethod,
+				[In, Optional] IntPtr pUnk);
 		}
 
 		/// <summary/>
@@ -77,7 +82,7 @@ public class ContextSwitcher : IContextCallback
 			/// <inheritdoc/>
             [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
 			public virtual extern HRESULT ContextCallback(
-                PFNCONTEXTCALL pfnCallback,
+                [MarshalAs(UnmanagedType.FunctionPtr)] PFNCONTEXTCALL pfnCallback,
                 in ComCallData pParam,
                 in Guid riid,
                 int iMethod,