通過反射獲取指針值

Question

我有一個類型object的實例，我知道它是一個指針（可以很容易地用myobject.GetType().IsPointer驗證myobject.GetType().IsPointer ）。 是否可以通過反射獲得指針的值？

代碼到目前為止：

object obj = .... ; // type and value unknown at compile time
Type t = obj.GetType();

if (t.IsPointer)
{
    void* ptr = Pointer.Unbox(obj);

    // I can obtain its (the object's) bytes with:
    byte[] buffer = new byte[Marshal.SizeOf(t)];
    Marshal.Copy((IntPtr)ptr, buffer, 0, buffer.Length);

    // but how can I get the value represented by the byte array 'buffer'?
    // or how can I get the value of *ptr?
    // the following line obviously doesn't work:
    object val = (object)*ptr; // error CS0242 (obviously)
}

---

附錄№1：由於有問題的對象是值類型- 不是引用類型-我不能使用GCHandle::FromIntPtr(IntPtr)后跟GCHandle::Target來獲取對象的值...

Answer 1

我想你需要的是PtrToStructure。 像這樣的東西：

if (t.IsPointer) {
    var ptr = Pointer.Unbox(obj);

    // The following line was edited by the OP ;)
    var underlyingType = t.GetElementType();
    var value = Marshal.PtrToStructure((IntPtr)ptr, underlyingType); 
}