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.h和MyControl.cpp从Generated 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?