DataStream, VC2005 - Multi-Threaded (/MT) (/MD)

dermont

08-08-2006 13:57:43

I've enountered some problems parsing a datastream from a dotsceneoctree file. The same code worked with mingw and earlier versions of pyogre. With VisualC++ 2005 "getAsString" occasionaly works but mostly crashes. "pStream.read(pStream.size())" always works.

The code is as follows:



   pStream = ogre.ResourceGroupManager.getSingleton().openResource("Example.material",'General')

   #data = pStream.getAsString()

   data = pStream.read(pStream.size())

   print data



   # MyScene.scene is just an xml file

   #pStream = ogre.ResourceGroupManager.getSingleton().openResource("MyScene.scene", "General")

   #data = pStream.getAsString()

   #data = pStream.read(pStream.size())

   #print data

Reading this thread I updated the c++ Code Generation Multi-Threaded (/MT) to DLL (/MD):
http://www.ogre3d.org/phpBB2/viewtopic. ... etasstring

I'm not really familiar with VC++2005 so I'm not sure of the implications of doing the above but I'm quite suprised that this hasn't been raised before.

dermont

08-08-2006 16:47:03

Ok I've looking at this further seems the problem is restricted to OpenGL (I'm using latest NVidia drivers). Here are the steps that cause the crash on my computer:





  a)  Downloaded and install Istari's pyogre version

  b)  Run  above code 

      - DirectX runs OK,  OpenGL - crash

  c)  Rerun 

      - OpenGL/DitrectX - crash

  d)  clear out C:\Python24\Lib\site-packages\pyogre

       clear out *.pyc files

       reinstall Istari's pyogre version 

  e)  Run  above code 

      - DirectX runs OK, OpenGL crashes as before 

   f) renamed RenderSystem_GL.dll to ensure stray DLL not being picked up

  g) Compile pyogre with /MT, same crashes   

  h) Compile pyogre with /MD both DirectX / OpenGL work fine

Istari

08-08-2006 23:19:02

After reading this http://support.microsoft.com/kb/q140584/ I'm thinking that PyOgre should probably be compiled with /MD
Since all the other libraries that it links against use /MD

dermont

09-08-2006 01:59:41

Ok, could be a follow on from pre pyogre 1.0.6 which I think was setup to use Visual C++ Toolkit 2003 and AFAIK, doesn't support /MD. Also there appears to be an approx 5% performance drop using MD as compared to MT.