[vtkusers] Memory leak I cant understand: Detected memory leaks! Dumping Objects ->

[David Cole]

False memory leak reports are caused by VTK dlls loading *before* MFC dlls.
You have to use the linker's /delayload flag to avoid this issue.

The /delayload flag should be correct by default in the MFC examples if you
are using CVS VTK... If you are using a previous version of VTK (5.0 or
earlier) then you will have to figure out a way to link with that flag.

See the CVS version of files in VTK/GUISupport/MFC for details. Or grep the
VTK source tree for "DELAYLOAD"

HTH,
David

On 5/10/07, Marcus Wilkinson <wilkinsonmarcus at gmail.com> wrote:
>
> Hi All,
>
> I have limited experience with VTK, but from what I know about memory
> management, I should be getting no memory leaks at all in my application at
> all.
> I have 2 DLL's, one containing my main sound analysis program and another
> holding VTK code for visualisation.
> Sound.dll loads Visualisation.dll via a call to LoadLibrary("
> Vlisualisation.dll");
>
> Inside Visualisation.dll, I have a class "CVisualisationApp", which is
> instantiated by static functions in the Visualisation.dll such as
> "CreateSystem(), DestroySystem() etc". These static functions are called
> externally by Sound.dll. This CVisualisationApp class holds all references
> to VTK objects and extends CWinApp - it also holds the render function and
> handles all UI basically. There are no calls to VTK elements outside of this
> class.
>
> This CVisualisationApp class is instantiated by one of the static
> functions {"CreateSystem()"} which just does:
> theApp = new CVisualisationApp();
>
> so basically, by Visualisation.h looks something like this:
>
> class CVisualisationApp : public CWinApp
> {
> public:
>     CVisualisationApp();
>     ~CVisualisationApp();
>
> public:
>     virtual BOOL InitInstance();
>     BOOL Render(double dt);
>    //more functions and fun
> }
>
> and my Visualisation.cpp looks a bit like this:
>
> CVisualisationApp *theApp = 0;
>
> extern "C" __declspec( dllexport )
> int __cdecl createSystem() {
>     if (theApp != 0)
>         return 0;
>     theApp = new CVisualisationApp();
>     theApp->InitInstance();
>     return 1;
> }
>
> CVisualisationApp::CVisualisationApp()
> {
>    //Instantiation stuff
> }
>
> CVisualisationApp::InitInstance()
> {
>    //Initialisation stuff
> }
>
>
> Now my problem is that even if I don't create the 'theApp' object (comment
> out the body of the createSystem() function), I still get memory leaks from
> VTK. I guess my question is, could VTK detect memory leaks from my main
> sound.dll app (although I don't think there are any leaks there) - or,
> does vtk have some static functions that could be causing memory leaks even
> though I don't create any objects. The output dump looks something like
> this:
>
>
> Detected memory leaks!
> Dumping objects ->
> {32407} normal block at 0x0B70B070, 4 bytes long.
>  Data: <PWh > 50 57 68 0B
> {32406} normal block at 0x0C996730, 8 bytes long.
>  Data: <@f      > 40 66 99 0C 00 00 00 00
> {32405} normal block at 0x0C997A38, 21 bytes long.
>  Data: <System Shutting > 53 79 73 74 65 6D 20 53 68 75 74 74 69 6E 67 20
> {32404} normal block at 0x0C997980, 120 bytes long.
>  Data: <\ p         #   > 5C 9F 70 0A 01 00 00 00 00 CD CD CD 23 03 02 00
> {32368} normal block at 0x0C9971D8, 168 bytes long.
>  Data: <                > CC B9 8F 09 01 00 00 00 00 CD CD CD 17 03 02 00
> {32367} normal block at 0x0C9970F0, 168 bytes long.
>  Data: <                > CC B9 8F 09 01 00 00 00 00 CD CD CD 15 03 02 00
> {32366} normal block at 0x0C997008, 168 bytes long.
>  Data: <            6   > CC B9 8F 09 02 00 00 00 00 CD CD CD 36 03 02 00
> {32365} normal block at 0x0C996640, 176 bytes long.
>  Data: < 2r         (   > A4 32 72 0A 01 00 00 00 00 CD CD CD 28 03 02 00
> {32364} normal block at 0x0C996588, 120 bytes long
> {{{  Pages and pages more }}}
>
>
> Thanks in advance for any thoughts you have - feel like my brain is
> melting on this one. If you need, I can provide a list of libs and include
> files.
>
> Marcus
>
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