Marshal callback as function pointer.

dahall · Feb 9, 2021 · 13cff6b · 13cff6b
1 parent cc4973b
commit 13cff6b
Showing 1 changed file with 17 additions and 9 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/>
@@ -73,18 +78,21 @@ public struct ComCallData
 		// https://docs.microsoft.com/en-us/windows/win32/api/ctxtcall/nn-ctxtcall-icontextcallback
 		[ComImport, Guid("0000034e-0000-0000-C000-000000000046"), ClassInterface(ClassInterfaceType.None)]
 		public class ContextSwitcher : IContextCallback
-        {
+		{
 			/// <inheritdoc/>
-            [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
+			[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
 			public virtual extern HRESULT ContextCallback(
-                PFNCONTEXTCALL pfnCallback,
-                in ComCallData pParam,
-                in Guid riid,
-                int iMethod,
-                IntPtr pUnk = new IntPtr());
-        }
+				[MarshalAs(UnmanagedType.FunctionPtr)] PFNCONTEXTCALL pfnCallback,
+				in ComCallData pParam,
+				in Guid riid,
+				int iMethod,
+				IntPtr pUnk = new IntPtr());
+		}
 
 		/// <summary>CLSID_ContextSwitcher</summary>
 		public static readonly Guid CLSID_ContextSwitcher = new Guid(0x0000034e, 0x0000, 0x0000, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46);
+
+		/// <summary>IID_ICallbackWithNoReentrancyToApplicationSTA</summary>
+		public static readonly Guid IID_ICallbackWithNoReentrancyToApplicationSTA = new Guid(0x0a299774, 0x3e4e, 0xfc42, 0x1d, 0x9d, 0x72, 0xce, 0xe1, 0x05, 0xca, 0x57);
 	}
 }