如何在C ++-CLI中创建全局句柄 [英] How to create a global handle in C++-CLI

问题描述

我试图在C ++-CLI项目中使用C＃类，但是Visual Studio只允许我在函数内部在局部范围内声明C＃对象的句柄（^）。我唯一能正常工作的方法是声明一个指向句柄的全局指针：

I am trying to use a C# class in a C++-CLI project, but Visual Studio will only let me declare a handle (^) to a C# object in a local scope, just inside a function. The only way I got it working was declaring a global pointer to a handle:

SUTAdapter::Form1^ *ptForm1;

但是，如果我在函数内创建一个对象，并将其地址提供给全局指针：

But if then I create an object inside a function and give its address to the global pointer:

SUTAdapter::Form1^ form1;
form1 = gcnew SUTAdapter::Form1();
ptForm1 = &form1;
(*ptForm1)->incCounter(0);

当该函数退出并尝试在其他C ++-CLI函数中使用incCounter函数时，对象似乎消失了（调试器说这== null）。有没有办法在C ++-CLI中全局处理C＃代码？我猜因为某些我不了解的原因而禁止使用全局句柄，但是我没有想法，我需要这样做。谢谢。

When the function exits and I try to use the incCounter function inside some other C++-CLI function, the object seems gone (debugger says this == null). Is there a way to have a global handle of a C# code in C++-CLI? I guess global handles are forbidden for some reason I don't understand but I am out of ideas and I need this done. Thank you.

编辑：

*ptForm1 = gcnew SUTAdapter::Form1();

给出空引用异常。为什么？

Gives a null reference exception. Why?

推荐答案

此限制似乎与其他基于CLR的语言一致。例如，C＃没有静态的，函数范围的变量的概念。 C ++ / CLI中缺乏此类功能，这表明CLR的工作方式是-必须在类范围内定义静态对象。

This restriction seems consistent with the other CLR-based languages. C# has no concept of a static, function-scoped variable for example. The lack of such functionality in C++/CLI suggests that is the way the CLR works - static objects must be defined at the class scope.

CLR是基于对象的，因此

The CLR is object based, so this is just a case of that object-oriented nature influencing the design of languages that run on top of it.

从面向对象的角度来看，我更喜欢C＃方式，这只是面向对象性质影响在其上运行的语言设计的一种情况。无论如何。

From an OO view point, I like the C# way better anyway.

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