Wt

Hey,

That'sost likely a bug in wtwithqt lib. Can you file an issue?

As a workaround may I suggest to connect signals and show() the dialog?

Koen

Hi Koen,

I am not quite sure how I would connect the signals. (using the Wt or Qt way?)

Anyway, I built Qt fresh for VS 2012 and I get the same result. I have also attempted to simplify the issues and it seems to be related qtwithqt. (I removed the QObjects and just called messagebox in propagateGreet.

Looking at the stack, the two version are quite different:

hello.wt.exe!Wt::DispatchThread::doEvent() Line 141

hello.wt.exe!Wt::DispatchThread::myExec() Line 85

hello.wt.exe!Wt::DispatchThread::run() Line 70

QtCore4.dll!QThreadPrivate::start(void * arg) Line 298

msvcr110.dll!_callthreadstartex() Line 354

msvcr110.dll!_threadstartex(void * ptd) Line 332

kernel32.dll!BaseThreadInitThunk12()

ntdll.dll!_RtlUserThreadStart@8()

ntdll.dll!__RtlUserThreadStart@8()

and

hello.wt.exe!Wt::WebSession::handleRequest(Wt::WebSession::Handler & handler) Line 1486

hello.wt.exe!Wt::WebController::handleRequest(Wt::WebRequest * request) Line 661

hello.wt.exe!boost::_mfi::mf1<void,Wt::WebController,Wt::WebRequest ::operator()(Wt::WebController p, Wt::WebRequest * a1) Line 166

hello.wt.exe!boost::_bi::list2<boost::_bi::value<Wt::WebController ,boost::_bi::value<http::server::HTTPRequest> >::operator()<boost::_mfi::mf1<void,Wt::WebController,Wt::WebRequest ,boost::_bi::list0>(boost::bi::type_formal, boost::_mfi::mf1<void,Wt::WebController,Wt::WebRequest> & f, boost::bi::list0 & a, int_formal) Line 314

hello.wt.exe!boost::_bi::bind_t<void,boost::_mfi::mf1<void,Wt::WebController,Wt::WebRequest ,boost::_bi::list2<boost::_bi::value<Wt::WebController>,boost::_bi::value<http::server::HTTPRequest *> > >::operator()() Line 21

hello.wt.exe!boost::asio::asio_handler_invoke<boost::_bi::bind_t<void,boost::_mfi::mf1<void,Wt::WebController,Wt::WebRequest ,boost::_bi::list2<boost::_bi::value<Wt::WebController>,boost::_bi::value<http::server::HTTPRequest *> > > >(boost::_bi::bind_t<void,boost::_mfi::mf1<void,Wt::WebController,Wt::WebRequest ,boost::_bi::list2<boost::_bi::value<Wt::WebController>,boost::_bi::value<http::server::HTTPRequest *> > > function, ...) Line 65

hello.wt.exe!boost_asio_handler_invoke_helpers::invoke<boost::_bi::bind_t<void,boost::_mfi::mf1<void,Wt::WebController,Wt::WebRequest ,boost::_bi::list2<boost::_bi::value<Wt::WebController>,boost::_bi::value<http::server::HTTPRequest *> > >,boost::_bi::bind_t<void,boost::_mfi::mf1<void,Wt::WebController,Wt::WebRequest ,boost::_bi::list2<boost::_bi::value<Wt::WebController>,boost::_bi::value<http::server::HTTPRequest *> > > >(boost::_bi::bind_t<void,boost::_mfi::mf1<void,Wt::WebController,Wt::WebRequest ,boost::_bi::list2<boost::_bi::value<Wt::WebController>,boost::_bi::value<http::server::HTTPRequest *> > > & function, boost::_bi::bind_t<void,boost::_mfi::mf1<void,Wt::WebController,Wt::WebRequest ,boost::_bi::list2<boost::_bi::value<Wt::WebController>,boost::_bi::value<http::server::HTTPRequest *> > > & context) Line 39

hello.wt.exe!boost::asio::detail::completion_handler<boost::_bi::bind_t<void,boost::_mfi::mf1<void,Wt::WebController,Wt::WebRequest ,boost::_bi::list2<boost::_bi::value<Wt::WebController>,boost::bi::value<http::server::HTTPRequest *> > > >::do_complete(boost::asio::detail::win_iocp_io_service * owner, boost::asio::detail::win_iocp_operation * base, const boost::system::error_code &formal, unsigned int_formal) Line 67

hello.wt.exe!boost::asio::detail::win_iocp_operation::complete(boost::asio::detail::win_iocp_io_service & owner, const boost::system::error_code & ec, unsigned int bytes_transferred) Line 45

hello.wt.exe!boost::asio::detail::win_iocp_io_service::do_one(bool block, boost::system::error_code & ec) Line 405

hello.wt.exe!boost::asio::detail::win_iocp_io_service::run(boost::system::error_code & ec) Line 161

hello.wt.exe!boost::asio::io_service::run() Line 59

hello.wt.exe!Wt::WIOService::run() Line 161

hello.wt.exe!boost::_mfi::mf0<void,Wt::WIOService>::operator()(Wt::WIOService * p) Line 50

hello.wt.exe!boost::_bi::list1<boost::_bi::value<Wt::WIOService *> >::operator()<boost::_mfi::mf0<void,Wt::WIOService>,boost::_bi::list0>(boost::bi::type_formal, boost::_mfi::mf0<void,Wt::WIOService> & f, boost::bi::list0 & a, int_formal) Line 254

hello.wt.exe!boost::_bi::bind_t<void,boost::_mfi::mf0<void,Wt::WIOService>,boost::_bi::list1<boost::_bi::value<Wt::WIOService *> > >::operator()() Line 21

hello.wt.exe!boost::detail::thread_data<boost::_bi::bind_t<void,boost::_mfi::mf0<void,Wt::WIOService>,boost::_bi::list1<boost::_bi::value<Wt::WIOService *> > > >::run() Line 118

hello.wt.exe!boost::`anonymous namespace'::thread_start_function(void *)

msvcr110.dll!_callthreadstartex() Line 354

msvcr110.dll!_threadstartex(void * ptd) Line 332

kernel32.dll!BaseThreadInitThunk12()

ntdll.dll!_RtlUserThreadStart@8()

ntdll.dll!__RtlUserThreadStart@8()

As I am not using anything from Qt for this example, the problem seems to stem from wtwithqt.

I will post an issue. Let me know if you have any other thoughts.

Thanks,

Robert

Hey,

You need to connect a signal to WDialog::finished() and then show() the dialog. This will create a modal dialog without blocking the main event loop --- to the user it is entirely the same result.

Regards,

koen

Got it. That did work for asynchronous. Getting synchronous dialogs to work, would be great.