[英]How to get unmanaged pointer on an C# object?
I know how to create unmanaged pointer on struct. 我知道如何在struct上创建非托管指针。
But i want to have a unmanaged pointer that will point on an object. 但我希望有一个指向对象的非托管指针。
I already know that i need to protect the object from the GC using 我已经知道我需要使用GC来保护对象
GCHandle.Alloc(...);
But i can't find a way to define a pointer ... 但我找不到定义指针的方法......
Try using GCHandle.Alloc
with the second parameter GCHandleType.Pinned
. 尝试使用
GCHandle.Alloc
和第二个参数GCHandleType.Pinned
。 Also method GCHandle.AddrOfPinnedObject
might be helpful. 方法
GCHandle.AddrOfPinnedObject
也可能有用。
Try these two links: 试试这两个链接:
You can pin an instance like this: 您可以固定这样的实例:
GCHandle handle = GCHandle.Alloc(oldList, GCHandleType.Pinned);
Assuming it works, you can then take the address of the pinned object as a type-agnostic pointer, like this: 假设它有效,那么您可以将固定对象的地址作为类型不可知的指针,如下所示:
IntPtr ptr = handle.AddrOfPinnedObject();
Don't forget to explicitly release the handle before you lose track of it (otherwise the object will remain perpetually pinned): 不要忘记在失去跟踪之前显式释放句柄(否则对象将永久固定):
handle.Free();
Notice that I said "assuming it works" — not all objects can be pinned and those that can't will throw an exception when you attempt to pin them. 请注意,我说“假设它有效” - 并非所有对象都可以固定,而那些不能在您尝试固定它们时会抛出异常。
If you'd like to risk taking the address of a non-pinned object, you can use System.Runtime.CompilerServices.Unsafe
to attempt something like this: 如果您想冒险获取非固定对象的地址,可以使用
System.Runtime.CompilerServices.Unsafe
尝试这样的操作:
static unsafe void* VeryUnsafeGetAddress(this object obj)
{
return *(void**)Unsafe.AsPointer(ref obj);
}
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