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我试图在 IDL 中定义一个 Windows 运行时类型,并使用它的投影类型。从默认生成的空白应用UWP 项目(称为“空白应用”)开始,我添加了“MyControl.idl”

namespace BlankApp
{
    [default_interface]
    runtimeclass MyControl : Windows.UI.Xaml.Controls.Control
    {
        MyControl();
    }
}

编译解决方案,然后将MyControl.hMyControl.cppGenerated Files/sources复制到项目根目录。

我包含了投影类型的标题并将以下代码添加到App::OnLaunched

#include <winrt/BlankApp.h>

...

void App::OnLaunched(LaunchActivatedEventArgs const& e)
{
    auto const myControl{ winrt::BlankApp::MyControl() };
    ...

这一切都编译和链接得很好。在运行时,它会抛出一个hresult_error(0x80040154:REGDB_E_CLASSNOTREG 类未注册)。

引发异常时的调用堆栈顶部如下所示:

BlankApp.exe!winrt::hresult_error::hresult_error(const HRESULT code=REGDB_E_CLASSNOTREG Class not registered, winrt::hresult_error::from_abi_t __formal={...}) Line 2977  C++ Symbols loaded.
BlankApp.exe!winrt::throw_hresult(const HRESULT result=REGDB_E_CLASSNOTREG Class not registered) Line 3211  C++ Symbols loaded.
BlankApp.exe!winrt::check_hresult(HRESULT result=REGDB_E_CLASSNOTREG Class not registered) Line 3261    C++ Symbols loaded.
BlankApp.exe!winrt::impl::get_activation_factory<winrt::BlankApp::MyControl,winrt::Windows::Foundation::IActivationFactory>() Line 7375 C++ Symbols loaded.
BlankApp.exe!winrt::impl::factory_cache_entry<winrt::BlankApp::MyControl,winrt::Windows::Foundation::IActivationFactory>::get() Line 7448   C++ Symbols loaded.
BlankApp.exe!winrt::get_activation_factory<winrt::BlankApp::MyControl,winrt::Windows::Foundation::IActivationFactory>() Line 7520   C++ Symbols loaded.
BlankApp.exe!winrt::BlankApp::MyControl::MyControl() Line 74    C++ Symbols loaded.
BlankApp.exe!winrt::BlankApp::implementation::App::OnLaunched(const winrt::Windows::ApplicationModel::Activation::LaunchActivatedEventArgs & e={...}) Line 50   C++ Symbols loaded.

module.g.cpp被编译到应用程序中并包含以下代码:

HRESULT __stdcall WINRT_GetActivationFactory(HSTRING classId, void** factory)
{
    try
    {
        *factory = nullptr;
        wchar_t const* const name = WindowsGetStringRawBuffer(classId, nullptr);

        if (0 == wcscmp(name, L"BlankApp.MainPage"))
        {
            *factory = winrt::detach_abi(winrt::make<winrt::BlankApp::factory_implementation::MainPage>());
            return S_OK;
        }

        if (0 == wcscmp(name, L"BlankApp.MyControl"))
        {
            *factory = winrt::detach_abi(winrt::make<winrt::BlankApp::factory_implementation::MyControl>());
            return S_OK;
        }

#ifdef _WRL_MODULE_H_
        return ::Microsoft::WRL::Module<::Microsoft::WRL::InProc>::GetModule().GetActivationFactory(classId, reinterpret_cast<::IActivationFactory**>(factory));
#else
        return winrt::hresult_class_not_available().to_abi();
#endif
    }
    catch (...)
    {
        return winrt::to_hresult();
    }
}

很明显,我的类型没有注册以供 Windows 运行时查找,即使一切似乎都在它需要的位置。我缺少一些注册步骤吗?还是 UWP 应用程序支持这一点,而不是 Windows 运行时组件?

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1 回答 1

2

您可能需要将该类添加到 appx 清单中。

扩展元素文档中有一个示例。需要添加以下扩展元素:

<Extensions>
  <Extension Category="windows.activatableClass.inProcessServer">
    <InProcessServer>
      <Path>BlankApp.exe</Path>
      <ActivatableClass ActivatableClassId="BlankApp.MyControl" ThreadingModel="both" />
    </InProcessServer>
  </Extension>
</Extensions>

要允许 Windows 运行时检索激活工厂,DllGetActivationFactory还需要从可执行文件中导出符号。这可以通过将以下 .def 文件添加到项目中来完成:

EXPORTS
DllCanUnloadNow = WINRT_CanUnloadNow                    PRIVATE
DllGetActivationFactory = WINRT_GetActivationFactory    PRIVATE
于 2018-06-17T15:44:33.827 回答