HtmlUtilities::ConvertToText Crash in WinUI 3 App with C++/WinRT

[sotanakamura]

This is a bug. Trace this issue microsoft/microsoft-ui-xaml#8153 (comment)

Hello everyone!

I have a problem on Windows SDK API HtmlUtilities::ConvertToText in WinUI 3 App with C++/WinRT. Calling it in UWP app is OK, but not in WinUI 3 App. In WinUI 3 App, Calling it after starting the application by Application::Start throws an exception. However, Calling it before starting application has no problem and calling it again after stating application is OK too. You can reproduce this error by creating a project from WinUI 3 and UWP project template.

I want to know if it is a bug or a mistake. HtmlUtilities is non-agile class, is it related to the problem? If it is a mistake, please tell me how to fix it.

Thanks!

[DarranRowe]

A simple:

auto result = winrt::Windows::Data::Html::HtmlUtilities::ConvertToText(L"<Button>Hello</Button>");

works fine in the Xaml's main window constructor. This is in a WinUI 3 application referencing the Windows App SDK 1.2.3 package.

It would be nice to know exactly what you are doing. But according to the documentation, there is no reason why this runtime class shouldn't work, and the class not being agile isn't an issue since it only has a single static member.

[sotanakamura]

Thank you for your reply. Xaml's main window constructor? Dose it mean MainWindow constructor? I tried calling HtmlUtilities::ConvertToText in MainWindow constructor:

// MainWindow.xaml.cpp

MainWindow::MainWindow()
{
    InitializeComponent();
    auto result = winrt::Windows::Data::Html::HtmlUtilities::ConvertToText(L"<Button>Hello</Button>");
}

I also updated Windows App SDK 1.2.3. I still have the same problem. I need more help.

[DHancock]

I can reproduce the crash in both a packaged and an unpackaged app built for Windows App SDK 1.2.3 running on Windows 22H2 (OS build 22621.1194). It looks like a bug.

With native debugging enabled I got the following stack trace:

 	iertutil.dll!wil::details::WilDynamicLoadRaiseFailFastException(struct _EXCEPTION_RECORD *,struct _CONTEXT *,unsigned long)	Unknown
 	iertutil.dll!wil::details::WilRaiseFailFastException(struct _EXCEPTION_RECORD *,struct _CONTEXT *,unsigned long)	Unknown
 	iertutil.dll!wil::details::WilFailFast(struct wil::FailureInfo const &)	Unknown
 	iertutil.dll!wil::details::ReportFailure_NoReturn<3>(void *,unsigned int,char const *,char const *,char const *,void *,struct wil::details::ResultStatus const &,unsigned short const *,enum wil::details::ReportFailureOptions)	Unknown
 	iertutil.dll!wil::details::ReportFailure_Base<3,0>(void *,unsigned int,char const *,char const *,char const *,void *,struct wil::details::ResultStatus const &,unsigned short const *,enum wil::details::ReportFailureOptions)	Unknown
 	iertutil.dll!wil::details::ReportFailure_Hr<3>(void *,unsigned int,char const *,char const *,char const *,void *,long)	Unknown
 	iertutil.dll!wil::details::in1diag3::_FailFast_Unexpected(void *,unsigned int,char const *)	Unknown
 	iertutil.dll!_CreateUriPriv@32�()	Unknown
 	iertutil.dll!_CreateUri@16�()	Unknown
 	edgehtml.dll!CMarkup::GetUri()	Unknown
 	edgehtml.dll!CMarkup::GetSecurityIdOptimistic()	Unknown
 	edgehtml.dll!CMarkup::GetSecurityID()	Unknown
 	edgehtml.dll!CMarkup::CreateWindowHelper()	Unknown
 	edgehtml.dll!CDoc::CreateMarkupFromInfo()	Unknown
 	edgehtml.dll!CDoc::Init()	Unknown
 	edgehtml.dll!CBaseCF::CreateInstance()	Unknown
 	edgehtml.dll!InternalCreateInstance(struct _GUID const &,struct _GUID const &,void * *)	Unknown
 	edgehtml.dll!_CreateDocumentWithSite()	Unknown
 	edgehtml.dll!_ConvertHtmlToText@8�()	Unknown
 	Windows.Web.dll!Trident_ConvertHtmlToText(const wchar_t * szHtml, wchar_t * * pbstrText) Line 333	C++
 	Windows.Web.dll!HtmlUtilitiesFactory::ConvertToText(HSTRING__ * hstrHtml, HSTRING__ * * phstrText) Line 41	C++
 	[External Code]	
>	AudioStuff.dll!AudioStuff.FirstPage.FirstPage() Line 38	C#
 	[External Code]	
 	AudioStuff.dll!AudioStuff.MainWindow.RootNavigationView_SelectionChanged(Microsoft.UI.Xaml.Controls.NavigationView sender, Microsoft.UI.Xaml.Controls.NavigationViewSelectionChangedEventArgs args) Line 54	C#
 	[External Code]	
 	AudioStuff.dll!AudioStuff.MainWindow.MainWindow() Line 44	C#
 	AudioStuff.dll!AudioStuff.App.OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args) Line 49	C#
 	[External Code]	
 	[Inline Frame] hostpolicy.dll!coreclr_t::execute_assembly(int) Line 89	C++
 	hostpolicy.dll!run_app_for_context(const hostpolicy_context_t & context, int argc, const wchar_t * * argv) Line 255	C++
 	hostpolicy.dll!run_app(const int argc, const wchar_t * * argv) Line 284	C++
 	hostpolicy.dll!corehost_main(const int argc, const wchar_t * * argv) Line 430	C++
 	hostfxr.dll!execute_app(const std::wstring & impl_dll_dir, corehost_init_t * init, const int argc, const wchar_t * * argv) Line 147	C++
 	hostfxr.dll!`anonymous namespace'::read_config_and_execute(const std::wstring & host_command, const host_startup_info_t & host_info, const std::wstring & app_candidate, const std::unordered_map<enum known_options,std::vector<std::wstring,std::allocator<std::wstring>>,known_options_hash,std::equal_to<enum known_options>,std::allocator<std::pair<enum known_options const ,std::vector<std::wstring,std::allocator<std::wstring>>>>> & opts, int new_argc, const wchar_t * * new_argv, host_mode_t mode, const bool is_sdk_command, wchar_t * out_buffer, int buffer_size, int * required_buffer_size) Line 533	C++
 	hostfxr.dll!fx_muxer_t::handle_exec_host_command(const std::wstring & host_command, const host_startup_info_t & host_info, const std::wstring & app_candidate, const std::unordered_map<enum known_options,std::vector<std::wstring,std::allocator<std::wstring>>,known_options_hash,std::equal_to<enum known_options>,std::allocator<std::pair<enum known_options const ,std::vector<std::wstring,std::allocator<std::wstring>>>>> & opts, int argc, const wchar_t * * argv, int argoff, host_mode_t mode, const bool is_sdk_command, wchar_t * result_buffer, int buffer_size, int * required_buffer_size) Line 1018	C++
 	hostfxr.dll!fx_muxer_t::execute(const std::wstring host_command, const int argc, const wchar_t * * argv, const host_startup_info_t & host_info, wchar_t * result_buffer, int buffer_size, int * required_buffer_size) Line 594	C++
 	hostfxr.dll!hostfxr_main_startupinfo(const int argc, const wchar_t * * argv, const wchar_t * host_path, const wchar_t * dotnet_root, const wchar_t * app_path) Line 61	C++
 	AudioStuff.exe!exe_start(const int argc, const wchar_t * * argv) Line 235	C++
 	AudioStuff.exe!wmain(const int argc, const wchar_t * * argv) Line 304	C++
 	[External Code]	

[DarranRowe]

@sotanakamura
Right, I see the problem in a packaged application. It seems like calling Microsoft.UI.Xaml.Application.Start just interferes for some reason. This is something that shouldn't happen, so this is a bug. Go ahead and create an issue for this over on the Microsoft.UI.Xaml github repository, since this is a Xaml issue.

I couldn't get this to happen in an unpackaged application, since that loads mshtml.dll, not edgehtml.dll. I also didn't see this occur in a packaged non-WinUI 3 application.

This is something that needs to looked at by the developers, so the best you can do is for now is do as you already noted. Call it once before you call Application.Start.

[sotanakamura]

I will move this discussion to windows-ui-xaml issues.
Thank you, DarranRowe and DHancock