在 WP8 中从 C++ 代码调用 C# 方法 [英] Calling C# method from C++ code in WP8

问题描述

我对从 Windows Phone 8 中的 C++ 代码调用 C# 方法很感兴趣.我已经学会了如何通过 C++ 代码中的委托声明将回调函数从 C# 传递给 C++ 代码，但我想看看是否我可以执行以下任何操作:

• 直接从 C++ 代码调用某些方法.这将涉及以某种方式检查 C++ 中的 C# 对象构成，这对我来说似乎不太可能，但我想我还是会问你们所有人

• 在 C# 代码中触发事件，然后可以由 C# 方法处理

• 使用调度器在主 UI 线程中调用 C# 回调，以便回调可以修改 UI 元素

• 在C#代码中使用dispatcher触发事件，(本质上是以上两点的合并)

简而言之，我正在寻找尽可能多的 C++ --> C# 通信技巧，你们可以扔给我，我想全部学习.:)

解决方案

通过在 C# 代码中获取一个对象来实现 Windows RT 接口，并向下传递对该对象的引用，可以使用一些设置(如果我理解正确 - 不确定您想用 Dispatcher 示例做什么 - 您可能希望将 Dispatcher 包装在 C# 端).

1. 创建 Windows 运行时组件库.
2. 在 C++/CX 标头中定义一个 公共接口类，以便 C# 实现(C++ 调用)(例如 ICallback).
3. 在 C++/CX 头文件中定义一个 public ref class 以供 C++ 实现(C# 调用)(例如 CppCxClass).

4. 在 CppCxClass 中添加一个方法，用于传递和存储 ICallback.(为了简洁起见，显示了 C++ 全局变量，我建议您查看此内容，看看是否可以找到更好的位置将其存储在代码库中).

   <块引用>

   ICallback^ globalCallback;...void CppCxClass::SetCallback(ICallback ^callback){globalCallback = 回调；}

5. 在 C# 代码中引用 WinRT 库.

6. C# 代码:使用 var cppObject = new CppCxClass() 创建 CppCxClass 的实例.
7. C# 代码:创建一个实现 ICallback 的类(例如 CSharpCallbackObject).
8. C# 代码:将 CSharpCallbackObject 的实例传递给 C++.例如.cppObject.SetCallback(new CSharpCallbackObject()).

您现在可以使用 globalCallback->CallCsharp(L"Hello C#"); 调用 C#.您应该能够扩展 ICallback 和/或 CppCxObject 来完成其余的任务.

I'm interested in calling a C# method from C++ code in Windows Phone 8. I have already learned how to pass a callback function to C++ code from C# via delegate declarations in my C++ code, but I am looking to see if I can do any of the following:

• Call certain methods directly from the C++ code. This would involve somehow inspecting the C# object makeup from C++, and seems unlikely to me, but I thought I'd ask you all anyway

• Trigger events in the C# code, which can then be handled by C# methods

• Use a dispatcher to call C# callbacks in the Main UI thread so that the callbacks can modify UI elements

• Use a dispatcher to trigger events in the C# code, (Essentially a merging of the above two points)

In short, I am looking for as many C++ -->C# communication tips as you guys can throw me, I want to learn it all. :)

解决方案

By getting an object in C# code to implement a Windows RT interface, and passing down a reference to this object, it is possible to do all of the above with a bit of set-up (if I understand correctly - not sure about exactly what you want to do with your Dispatcher examples - you might want to wrap the Dispatcher on the C# side).

1. Create a Windows Runtime component library.
2. Define a public interface class in a C++/CX header for the C# to implement (C++ to call) (e.g. ICallback).
3. Define a public ref class in a C++/CX header for the C++ to implement (C# to call) (e.g. CppCxClass).

4. Add a method in CppCxClass that passes and stores an ICallback. (A C++ global variable is shown for consiseness, I recommend you review this to see if you can find a better place to store this in your code-base).

   ICallback^ globalCallback;
   ...
   void CppCxClass::SetCallback(ICallback ^callback)
   {
       globalCallback = callback;
   }
   

5. Reference the WinRT library in your C# code.

6. C# code: create an instance of CppCxClass using var cppObject = new CppCxClass().
7. C# code: create a class which implements ICallback (e.g. CSharpCallbackObject).
8. C# code: pass an instance of CSharpCallbackObject down to C++. E.g. cppObject.SetCallback(new CSharpCallbackObject()).

You can now call C# with globalCallback->CallCsharp(L"Hello C#");. You should be able to extend either ICallback and/or CppCxObject to do the rest of your tasks.

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