Re: [Plplot-general] plplot build error

[winson <roa...@ya...>]

I finally put the library compiled into use. I added
the following code in my program, as suggested by the
wxWidgets example in the document.

#include "plplotP.h"
#include "plstream.h"
#include "wxPLplotstream.h"
#include "wx/dcmemory.h"
#include "wx/bitmap.h"
#include "wx/dc.h" 

class MyPanelGraph: public wxPanel
{
public:
   MyPanelGraph(wxWindow* parent);
   void OnPaint( wxPaintEvent &WXUNUSED(event) );
private:
   int MemPlotDC_width;
   int MemPlotDC_height;
   wxMemoryDC* MemPlotDC;
   wxPLplotstream* mPlotstream;
   wxBitmap* MemPlotDCBitmap;

   DECLARE_EVENT_TABLE()
};

BEGIN_EVENT_TABLE(MyPanelGraph, wxPanel)
EVT_PAINT(MyPanelGraph::OnPaint)
END_EVENT_TABLE()

MyPanelGraph::MyPanelGraph(wxWindow* parent)
:wxPanel(parent, wxID_ANY, wxDefaultPosition,
wxDefaultSize, wxBORDER_NONE)
{
   MemPlotDC = new wxMemoryDC();
   MemPlotDCBitmap = new wxBitmap( 640, 400, -1 );
   MemPlotDC->SelectObject( *MemPlotDCBitmap );
->>mPlotstream = new wxPLplotstream((wxDC*)MemPlotDC, 

       MemPlotDC_width, MemPlotDC_height );
}

(OnPaint handler...)

When I built the program, everything was fine. When I
got into debug, I got an error message at the position
marked by arrows, as following:

"HEAP CORRUPTION DETECTED: after Normal block (#18524)
at 0x01809940. CRT detected that the application wrote
to the memory after end of heap buffer."

At this point, the thread points to
wxWindow::MSWCreate.
And the call stack points to msvcr80d.dll!1021bd53().

I just started to use wxWidgets, and I am not sure if
the plplot library compiled is ready for use yet. So I
am not sure where the problem could be. Any insight?
Thanks.

Winson






 
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