我正在尝试从面向 Win 10 x64 的桌面 Windows 应用程序中以 C++ (winrt) 显示消息对话框。以下代码执行，但未显示对话框。ShowAsync 的返回代码很好
int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
_In_opt_ HINSTANCE hPrevInstance,
_In_ LPWSTR lpCmdLine,
_In_ int nCmdShow)
{
Microsoft::WRL::Wrappers::RoInitializeWrapper init(RO_INIT_SINGLETHREADED);
Microsoft::WRL::ComPtr<ABI::Windows::UI::Popups::IMessageDialogFactory> messageDialogFactory;
Microsoft::WRL::Wrappers::HStringReference messageDialogFactoryId(RuntimeClass_Windows_UI_Popups_MessageDialog);
Windows::Foundation::GetActivationFactory(messageDialogFactoryId.Get(), messageDialogFactory.GetAddressOf());
Microsoft::WRL::ComPtr<ABI::Windows::UI::Popups::IMessageDialog> messageDialog;
Microsoft::WRL::ComPtr<ABI::Windows::Foundation::Collections::IVector<ABI::Windows::UI::Popups::IUICommand*>> uiCommands;
messageDialogFactory->CreateWithTitle(Microsoft::WRL::Wrappers::HStringReference(L"XXX").Get(), Microsoft::WRL::Wrappers::HStringReference(L"YYY").Get(), messageDialog.GetAddressOf());
messageDialog->get_Commands(uiCommands.GetAddressOf());
Microsoft::WRL::ComPtr<ABI::Windows::UI::Popups::IUICommandFactory> uiCommandFactory;
Microsoft::WRL::Wrappers::HStringReference commandFactoryId(RuntimeClass_Windows_UI_Popups_UICommand);
Windows::Foundation::GetActivationFactory(commandFactoryId.Get(), uiCommandFactory.GetAddressOf());
w::ComPtr<pu::IUICommand> button;
uiCommandFactory->CreateWithHandler(Microsoft::WRL::Wrappers::HStringReference(L"ZZZ").Get(), new ButtonHandler(), button.GetAddressOf());
uiCommands->Append(button.Get());
Microsoft::WRL::ComPtr<ABI::Windows::Foundation::IAsyncOperation<ABI::Windows::UI::Popups::IUICommand*>> showOperation;
HRESULT hr = messageDialog->ShowAsync(showOperation.GetAddressOf());
MSG msg;
while( ::GetMessage(&msg, 0, 0, 0) > 0 )
{
::TranslateMessage(&msg);
::DispatchMessage(&msg);
}
return 0;
}