从iOS上的本地方法运行时创建委托 [英] Create delegate at runtime from native method on iOS

问题描述

这是一个特定的MonoTouch - 的问题。

我目前正在开发的OpenGL的包装是从像OpenTK包装完全不同。这种包装是用来启用OpenGL的更快发展

I'm currently developing a wrapper for OpenGL which is quite different from wrappers like OpenTK. This wrapper is used to enable faster development with OpenGL.

方法不声明如下：无效glGenTextures（的Int32 N，UInt32的[]纹理） ; ，它们被声明像无效glGenTextures（的Int32算，[出] TextureHandle []纹理），其中 TextureHandle 是相同尺寸为 UInt32的。

Methods are not declared like this: void glGenTextures(Int32 n, UInt32[] textures);, they are declared like void glGenTextures(Int32 count, [Out]TextureHandle[] textures) where TextureHandle is a structure with the same size as a UInt32.

在Windows上，我可以使用 GetProcAddress的， wglGetProcAddress 和 Marshal.GetDelegateForFunctionPointer 从方法指针创建委托，但如何与MonoTouch的做iOS上。有什么办法来这还是它不受MonoTouch的被支持

On Windows i can use GetProcAddress, wglGetProcAddress and Marshal.GetDelegateForFunctionPointer to create a delegate from a method pointer, but how to do this on iOS with MonoTouch. Is there any way to this or is it not supported by monotouch yet?

推荐答案

的用的MonoTouch 5.4开始这是可能的。您需要创建具有相同签名的管理方法的委托，并与 MonoNativeFunctionWrapper 属性装饰它：

Starting with MonoTouch 5.4 this is possible. You need to create a delegate with the same signature as the managed method, and decorate it with the MonoNativeFunctionWrapper attribute:

[MonoNativeFunctionWrapper]
public delegate void glGenTexturesDelegate (int n, uint[] textures);

现在，你可以调用方法：

Now you can call the method:

var del = (glGenTexturesDelegate) Marshal.GetDelegateForFunctionPointer (pointer);
del (n, textures);

这是说，我相信你正在做这个有很多更复杂的比你需要。只需使用的P / Invoke：

That said, I believe you're doing this a lot more complicated than you need to. Just use a P/Invoke:

[llImport("libGLESv2.dll")]
extern static void glGenTextures (int n, uint[] textures);

然后调用它是这样的：

and then call it like this:

glGenTextures (n, textures);

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