[SDL] misc. errors

Atrix Wolfe Atrix2 at cox.net
Tue Jul 23 15:24:00 PDT 2002


i have it set to multi threaded dll but that heap checking function will come in handy for debugging further. Thanx (:
  ----- Original Message ----- 
  From: Blake Senftner 
  To: sdl at libsdl.org 
  Sent: Tuesday, July 23, 2002 12:05 PM
  Subject: Re: [SDL] misc. errors


  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 );
        break;

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

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

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

  -Blake
    ----- 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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