Hi Pedro
I have included the devel list on this email, so the thread will get
documented on the mailing list.
It is very strange that the OnCreate function is not being called. If
you are calling Create then you should be generating a create event.
Am I correct in saying that you are getting this segfault with the
unchanged demo app?
This location really is the best (and maybe only) place this
initialisation should be done. It cannot be included in the
constructor, because the generic nature of the template specification
means the code in the constructor does not know which type of wxWindow
we are inheriting from so cannot pass the correct parameters to the
constructor. By the time OnPaint is called it is really too late,
because we would like to already have the plot initialised and ready
to draw and it would be a real pain for you in your code if you had to
somehow wait for the first paint or resize event.
I do have access to a CentOS machine at work, although I think I have
only got access to wxWidgets 2.8 on that system. I will check. I may
be able to build 3.1 from source. I presume you are using 3.1.0 as
released in February, rather than the head of the master branch?
On 10 December 2016 at 07:52, Pedro Vicente
<pedro.vice...@space-research.org> wrote:
> Hi Phil
>
> My idea for a fix is to move the stream initialization that is now on
>
> void wxPLplotwindow<WXWINDOW>::OnCreate( wxWindowCreateEvent &event
> {
> if ( !m_created )
>
> either to the OnSize or onPaint events
>
> void wxPLplotwindow<WXWINDOW>::OnSize( wxSizeEvent& WXUNUSED( event ) )
>
> and also in the plot call do this
>
> template< class WXWINDOW >
> void Plot( wxPLplotwindow<WXWINDOW> *plotwindow )
> {
> wxPLplotstream* pls = plotwindow->GetStream();
>
> if (pls == NULL)
> {
> return;
> }
>
>
> Like this , in this sequence
>
>
> wxPLplotwindow<wxFrame> *frame = new wxPLplotwindow<wxFrame>();
> frame->Create( NULL, wxID_ANY, wxT( "wxPLplotDemo" ) );
> frame->SetIcon( wxIcon( graph ) );
> frame->Show();
> Plot( frame );
>
>
> first we go to
> Plot( frame );
>
> but the stream is NULL because
> :OnCreate
> was not called, but the function returns, avoiding the seg fault
>
> then the window gets a paint or size event, and the stream initialization
> code is called
> at this time I have a PLplot empty black window
>
> but because
> Plot( frame );
> was only called at start, it is not called again, so there is no draw
>
> any ideas here ?
>
> of course making the Plot() call in another app function should work
>
>
> If you could replicate this issue, that would be great.
> I am using CentOS 6.8, PLplot.5.11.1 , wxWidgets 3.1.0
>
>
>
>
>
> ----- Original Message ----- From: Pedro Vicente
> To: plplot-devel@lists.sourceforge.net ; Phil Rosenberg
> Sent: Saturday, December 10, 2016 12:59 AM
> Subject: Re: [Plplot-devel] wxPLplotDemo.cpp errors
>
>
> Hi Phil
>
> So, the issue seems to be the same that I have been reporting
>
>
> In the wxPLplotDemo.cpp code you have these callling functions
>
>
> wxPLplotwindow<wxFrame> *frame = new wxPlDemoFrame();
> frame->Create( NULL, wxID_ANY, wxT( "wxPLplotDemo" ) );
>
>
> that make 2 calls to the PLplot library, or the wxWidgets driver of it
> all these calls are in the header file wxPLplotwindow.h
>
> first the constructor is called
>
> template<class WXWINDOW>
> wxPLplotwindow<WXWINDOW>::wxPLplotwindow( bool useGraphicsContext, wxSize
> clientSize )
> : m_created( false ), m_initialSize( clientSize )
>
>
> then this call OnCreate() is called, like you mentioned
> and the !m_created bool makes the initialization of the stream happen
>
> the problem is that this function id *NOT* called on my linux build (it is
> on the Windows build)
> so therefore later
> wxPLplotstream* pls = plotwindow->GetStream();
>
> this is NULL, so therefore it seg faults on the plot calls
>
> //! This is called when the widow is created i.e. after WXWINDOW::Create
> // has been called. We note that this has been called to avoid attempting
> // to redraw a plot on a window that hasn't been created yet.
> template<class WXWINDOW>
> void wxPLplotwindow<WXWINDOW>::OnCreate( wxWindowCreateEvent &event )
> {
> if ( !m_created )
>
> so, one quick try is to put the code of
>
> void wxPLplotwindow<WXWINDOW>::OnCreate
> that is not called on the constructor maybe ?
>
> -Pedro
>
> ----- Original Message ----- From: Pedro Vicente
> To: plplot-devel@lists.sourceforge.net ; Phil Rosenberg
> Sent: Friday, December 09, 2016 11:57 PM
> Subject: [Plplot-devel] wxPLplotDemo.cpp errors
>
>
> Hi Phil
>
> So, resuming the last thread about wxWidgets, what I did was to build and
> run wxPLplotDemo.cpp from PLpplot 5.11.1 on CentOS 6.8
>
> all builds fine, but when I do run , I get a seg fault
>
> [pedro.vicente@rhw9121 c++]$ cd
> /data/home002/pvicente/plplot/build/examples/c++
> [pedro.vicente@rhw9121 c++]$ ./wxPLplotDemo
> Segmentation fault
>
> I know that only this information is not much help to you to debug, but in
> the next couple of days I'll be debugging this and posting here any
> solution.
>
> my cmake call was
>
> cmake .. -G "Unix Makefiles" -DBUILD_SHARED_LIBS:BOOL=OFF
> -DENABLE_f95:BOOL=OFF -DENABLE_tcl:BOOL=OFF -DENABLE_tk:BOOL=OFF
> -DCMAKE_INSTALL_PREFIX:PATH=/data/data127/pvicente/install/plplot-5.11.1d
> -DPL_HAVE_PTHREAD:BOOL=OFF -DPLD_xwin:BOOL=OFF -DPLD_wxwidgets:BOOL=ON
> -DwxWidgets_ROOT_DIR:PATH=/data/data127/pvicente/install/wxwidgets-3.1.0
> -DwxWidgets_LIB_DIR:PATH=/data/data127/pvicente/install/wxwidgets-3.1.0/lib
> -DwxWidgets_CONFIGURATION=mswud -DENABLE_MIX_CXX=ON
> -DwxWidgets_EXCLUDE_COMMON_LIBRARIES:BOOL=OFF
> -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON -DBUILD_TEST:BOOL=ON >& cmake.txt &
>
>
> the output of
> cmake
> and
> make
> are attached
>
> -Pedro
>
>
>
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