“本地类尚未加载"我的绑定错误 [英] "The native class hasn't been loading" error with my bindings

问题描述

我正在尝试为 GPUImage 项目创建绑定，但没有一个绑定类是在职的.例如，GPUImageView:

I'm trying to create bindings for GPUImage project, but none of binded classes is working. For example, GPUImageView:

在 ObjC 中，它是这样声明的(git 中的标头):

In ObjC it's declared like this (header in git):

@interface GPUImageView : UIView <GPUImageInput>
//then some fields, properties and methods I'm not interested in

所以，我的 ApiDefinition.cs 看起来像这样:

So, my ApiDefinition.cs looks like this:

namespace GPUImage
{
    [BaseType (typeof(NSObject))]
    [Model]
    interface GPUImageInput {
    }

    [BaseType (typeof(UIView))]
    interface GPUImageView : GPUImageInput {
        [Export ("initWithFrame:")]
        IntPtr Constructor(RectangleF frame);
    }
}

LinkWithAttributes:

LinkWithAttributes:

[assembly: LinkWith ("libGPUImage.a", LinkTarget.Simulator | LinkTarget.ArmV7 | LinkTarget.ArmV7s, ForceLoad = true, Frameworks = "CoreMedia CoreVideo OpenGLES QuartzCore AVFoundation UIKit Foundation")]

它可以正常构建并创建 dll.但是当我尝试在我的项目中像这样使用它时:

It builds ok and creates dll. But when I try to use it in my project like this:

var iv = new GPUImageView (new RectangleF (0, 0, 100, 100));

抛出异常:

无法创建类型为GPUImage.GPUImageView"的本机实例:本机类尚未加载.可以通过将 Class.ThrowOnInitFailure 设置为 false 来忽略此条件.

Could not create an native instance of the type 'GPUImage.GPUImageView': the native class hasn't been loaded. It is possible to ignore this condition by setting Class.ThrowOnInitFailure to false.

堆栈跟踪

在 MonoTouch.ObjCRuntime.Class.ThrowOnInitFailure == false iv 之后被创建，但无法使用(例如 AddSubview(iv) 不显示).

After MonoTouch.ObjCRuntime.Class.ThrowOnInitFailure == false iv was created, but unusable (e.g. AddSubview(iv) show nothing).

我认为 GPUImage.a 文件有问题，但我不知道如何以任何方式对其进行测试.

I suppose there is something wrong with GPUImage.a file, but I don't know how to test it in any way.

这是 7z，其中包含 2 个项目: TryingBindings -- 绑定本身；TryingGPUImage -- 正在使用的绑定；

Here is 7z with 2 projects in it: TryingBindings -- bindings themselves; TryingGPUImage -- bindings in use;

提前致谢.

附言这是 xamarin 论坛上这篇文章的链接.

推荐答案

感谢 Rolf Bjarne Kvinge

Thanks to Rolf Bjarne Kvinge

有两个问题:

1) 带有 LinkWith 属性的文件 (libGPUImage.linkwith.cs) 是没有编译.只需右键单击 TryingBindings 项目，添加，添加文件并选择它.

1) The file with the LinkWith attribute (libGPUImage.linkwith.cs) is not compiled. Just right-click the TryingBindings project, Add, Add files and select it.

2) 本机库不包含 i386(模拟器)的代码，仅包含手臂(设备).如果您自己构建本地库，则可以要么创建一个包含所有代码的通用库架构，或者您可以使用多个本机库，每个库支持一组不同的架构，并且每个原生库只有一个 LinkWith 属性.

2) The native library does not contain code for i386 (simulator), only arm (device). If you're building the native library yourself you can either create a universal library that contain code for all the architectures, or you can use several native libraries, each supporting a different set of architectures, and just have a LinkWith attribute for each native library.

错误 11497

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