[SDL] misc. errors

Blake Senftner bsenftner at earthlink.net
Tue Jul 23 12:06:00 PDT 2002

Make sure that you're running with the multithreaded dll selected for your project and any subproject/dlls that it uses. I had similar strangeness with a VC6/SDL/GL project before I corrected that error.

Also try using something similar to this routine to verify that your heap is not corrupted:

#include <malloc.h>
// -----------------------------------------------------------------
// 'msg' should be some identifier of the calling context
// -----------------------------------------------------------------
void CheckTheHeap( CHAR *msg )
   assert( msg );

   INT32 heapstatus = _heapchk();
   switch( heapstatus )
   case _HEAPOK:
      gApp->Print( "CHECKTHEHEAP:: %s: OK - heap is fine\n", msg );

   case _HEAPEMPTY:
      gApp->Print( "CHECKTHEHEAP:: %s: OK - heap is empty\n", msg );

      gApp->Print( "CHECKTHEHEAP:: %s: ERROR - bad start of heap\n", msg );
      exit( SYSERR );

      gApp->Print( "CHECKTHEHEAP:: %s: ERROR - bad node in heap\n", msg );
      exit( SYSERR );

  ----- Original Message ----- 
  From: Atrix Wolfe 
  To: sdl at libsdl.org 
  Sent: Tuesday, July 23, 2002 9:59 AM
  Subject: [SDL] misc. errors

  hi, theres 2 issues that im having with sdl and gl in win32 (im using msvc++ 6.0).

  My first problem is thaty when im running a windowed sdl/gl app and i minimize it it crashes.  Does anybody know a way to fix this?

  My other problem is that whenever I run a sdl/gl app i notice when i am just running it in debug mode (since it can report memory leaks and stuff)  i get the error:
  HEAP[Client.exe]: Invalid Address specified to RtlFreeHeap( 130000, 145b30 )

  I get this error even if i just do an sdl init and set a gl video mode then sdl_quit...just a barebones program.  I also get this error when i run the simple gl source available for download from the SDL homepage.

  Any ideas whats happening? At one point a person testing my app hit exit and their computer rebooted...mostly though it just crashed as it exited though with nothing visibly wrong.
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