我有一个C ++ WinRT组件,它是一个WinRtClassicComMix。我想定义一个方法,通过IAsyncOperation将自定义类返回给调用C#或WinJS代码。 当使用没有返回值的IAsyncAction时,一切正常,但是使用带有自动返回值的PPL的create_async会使VS 2012和VS 2013编译器崩溃。
相关细节:
接口和类在IDL中定义:
namespace MyControl
{
runtimeclass MyComponentColorTable;
[version(MyS_VERSION)]
[uuid(7BB5A348-C82C-4EC4-946F-5113843A6A83)]
[exclusiveto(MyComponentColorTable)]
interface IMyComponentColorTable: IInspectable
{
[propget] HRESULT Count([out, retval] unsigned long *value);
HRESULT GetAt([in] unsigned long index, [out, retval] ComponentColor *componentColor);
}
[version(MyS_VERSION)]
[activatable(MyS_VERSION)]
[marshaling_behavior(agile)]
[threading(both)]
runtimeclass MyComponentColorTable
{
[default] interface IMyComponentColorTable;
}
runtimeclass MyRendererScene;
[version(MyS_VERSION)]
[uuid(8D51F7F2-EDCF-4ED4-B556-03D3CC390A83)]
[exclusiveto(MyRendererScene)]
interface IMyRendererScene: IInspectable
{
HRESULT GetComponentColorTableAsync([in] GUID assetId, [out, retval] Windows.Foundation.IAsyncOperation<MyControl.MyComponentColorTable*>** operation);
}
}
相应的头文件:
class CMyRendererScene :
public Microsoft::WRL::RuntimeClass
<
RuntimeClassFlags<Microsoft::WRL::WinRtClassicComMix>,
IMyRendererScene
>
{
InspectableClass(RuntimeClass_MyControl_MyRendererScene, BaseTrust);
public:
CMyRendererScene(void);
~CMyRendererScene(void);
IFACEMETHOD(GetComponentColorTableAsync)(GUID assetId, ABI::Windows::Foundation::IAsyncOperation<ABI::MyControl::MyComponentColorTable*>** operation);
};
CPP:
IFACEMETHODIMP CMyRendererScene::GetComponentColorTableAsync(GUID assetId, ABI::Windows::Foundation::IAsyncOperation<ABI::MyControl::MyComponentColorTable*>** operation)
{
Concurrency::task_completion_event<ABI::MyControl::MyComponentColorTable*> tce;
auto tsk = Concurrency::create_task(tce);
auto asyncOp = Concurrency::create_async( [tsk]() -> Concurrency::task<ABI::MyControl::MyComponentColorTable*>
{
return tsk;
});
// ... Wrapping of the event-based model using task_completion_event happens here ...
return S_OK;
}
编译失败,导致VS C ++编译器崩溃:
错误1错误C1001:发生内部错误 编译器。 c:\ program files(x86)\ microsoft visual studio 11.0 \ vc \ include \ ppltasks.h 5513 1 MyControl
原因是create_async分配给asyncOp自动变量的行。我没有明确定义该变量,因为我无法找出正确的类型。 :(它可能需要是一个帽子类型,但ABI :: MyControl :: MyComponentColorTable *不能声明为^因为它没有定义为WinRT类,所以我假设create_async不能在这里使用,但如何我可以创建并返回我的类型的WinRT IAsyncOperation吗?MyComponentColorTable需要什么才能通过WinRT传回?并且IAvatarComponentColorTable不能用作返回类型,因为它是[exclusiveto(AvatarComponentColorTable)]。:(