File size: 2,556 Bytes
8c763fb | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
using System.Linq.Expressions;
using System.Runtime.InteropServices;
namespace System.Management.Automation.ComInterop
{
internal class DispatchArgBuilder : SimpleArgBuilder
{
private readonly bool _isWrapper;
internal DispatchArgBuilder(Type parameterType)
: base(parameterType)
{
_isWrapper = parameterType == typeof(DispatchWrapper);
}
internal override Expression Marshal(Expression parameter)
{
parameter = base.Marshal(parameter);
// parameter.WrappedObject
if (_isWrapper)
{
parameter = Expression.Property(
Helpers.Convert(parameter, typeof(DispatchWrapper)),
typeof(DispatchWrapper).GetProperty(nameof(DispatchWrapper.WrappedObject))
);
}
return Helpers.Convert(parameter, typeof(object));
}
internal override Expression MarshalToRef(Expression parameter)
{
parameter = Marshal(parameter);
// parameter == null ? IntPtr.Zero : Marshal.GetIDispatchForObject(parameter);
return Expression.Condition(
Expression.Equal(parameter, Expression.Constant(null)),
Expression.Constant(IntPtr.Zero),
Expression.Call(
typeof(Marshal).GetMethod(nameof(System.Runtime.InteropServices.Marshal.GetIDispatchForObject)),
parameter
)
);
}
internal override Expression UnmarshalFromRef(Expression value)
{
// value == IntPtr.Zero ? null : Marshal.GetObjectForIUnknown(value);
Expression unmarshal = Expression.Condition(
Expression.Equal(value, Expression.Constant(IntPtr.Zero)),
Expression.Constant(null),
Expression.Call(
typeof(Marshal).GetMethod(nameof(System.Runtime.InteropServices.Marshal.GetObjectForIUnknown)),
value
)
);
if (_isWrapper)
{
unmarshal = Expression.New(
typeof(DispatchWrapper).GetConstructor(new Type[] { typeof(object) }),
unmarshal
);
}
return base.UnmarshalFromRef(unmarshal);
}
}
}
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