C＃中 - 如何转换对象要IntPtr的和后面？ [英] C# - How To Convert Object To IntPtr And Back?

问题描述

我想从托管代码的对象传递给WINAPI功能的IntPtr 。这将在托管代码通过这个对象返回给我的回调函数的IntPtr 。这不是一个结构，它是一个类的实例。

I want to pass an object from managed code to a WinApi function as IntPtr. It will pass this object back to my callback function in managed code as IntPtr. It's not a structure, it's an instance of a class.

如何转换对象到的IntPtr 和后面？

How do I convert object to IntPtr and back ?

推荐答案

所以，如果我想通过WINAPI我使用的GCHandle

So if I want to pass a list to my callback function through WinApi I use GCHandle

// object to IntPtr (before calling WinApi):
List<string> list1 = new List<string>();
GCHandle handle1 = GCHandle.Alloc(list1);
IntPtr parameter = (IntPtr) handle1;
// call WinAPi and pass the parameter here

// back to object (in callback function):
GCHandle handle2 = (GCHandle) parameter;
List<string> list2 = (handle2.Target as List<string>);
list2.Add("hello world");

THX到的大卫·赫弗南

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