Re: [Plplot-devel] wxPLplotDemo.cpp errors

[Pedro V. <ped...@sp...>]

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: plp...@li... ; 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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