将指针转换为通用结构 [英] Cast pointer to generic structure

问题描述

我正在准备将指针投射到通用结构(可漂白). 当我使用非通用结构时，一切似乎都很好=>然后我可以使用Marshal.PtrToStructure(...)，但是该函数无法接收通用结构(为什么?)

I am traying to cast a pointer to a generic structure (blittable). It all seems fine when I am doing with non-generic structures => then I am able to use Marshal.PtrToStructure(...) but that function does not receive generic structures (Why ?)

所以我写了以下内容:

public static object ReadValue<T>(IntPtr ptr) where T : struct
    {
        var dm = new DynamicMethod("$", typeof(T), Type.EmptyTypes);
            ILGenerator il = dm.GetILGenerator();
            il.Emit(OpCodes.Ldc_I4, ptr.ToInt32());
            il.Emit(OpCodes.Ldobj, typeof(T));
            il.Emit(OpCodes.Ret);

            var func = (Func<T>)dm.CreateDelegate(typeof(Func<T>));
            return func();
    }

但是现在Ldobj指令有问题. VS给我: 附加信息:操作可能会破坏运行时的稳定性.

But now it is something wrong with the Ldobj instruction. VS gives me: Additional information: Operation could destabilize the runtime.

我在做什么错? 有谁知道解决这个问题的更好方法(通用结构的ptr)或发现此函数中的错误?

What am I doing wrong ? Does anyone knows better approach to this problem (ptr to generic structure) or has spotted an error in this function?

推荐答案

我不确定这是否适用于通用指针，但是.net中有一种方法可以在类型之间进行低级转换.它涉及StructLayout属性和FieldOffset为0的多个字段.

I am not sure if this works with generic pointers but there is a way in .net to low level cast between types. It involves the StructLayout attribute and multiple fields at FieldOffset of 0.

http://netpl.blogspot.com/2010/10/is-net-type-safe.html

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