Strange Crash Problem

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On 11/08/2006 at 10:42, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   9.603 
Platform:   Windows  ;   
Language(s) :     C++  ;

---------
Hi all

i try to make a copy paste system for polygons.
And i'm having some stability problems.

Here is the code of the "copy" part. Sorry, i couln't simplify it anymore so that it still crashes.

  
  
#include "c4d.h"  
#include "c4d_symbols.h"  
  
struct Clipboard  
{  
~Clipboard() { TakeObjects(NULL); }  
AutoAlloc<AtomArray> array;  
void TakeObjects( AtomArray* a );  
};  
  
void Clipboard::TakeObjects( AtomArray* a )  
{  
if( !array ) return;  
// free all stored objects  
array->FilterObjectChildren();  
for( LONG i=0; i<array->GetCount(); ++i )  
{  
    BaseObject* op = static_cast<BaseObject*>( array->GetIndex(i) );  
    BaseObject::Free( op );  
}   
array->Flush();  
GeAssert( array->GetCount()==0 );  
// copy pointers from a to array  
if( a ) a->CopyTo( array );  
}  
  
  
static Clipboard *g_clip = NULL;  
  
  
void FreeClipboard()   
{  
gDelete( g_clip );  
}  
  
Clipboard* GetClipboard()   
{  
if( !g_clip ) {  
    g_clip = gNew Clipboard;  
}  
return g_clip;  
}  
  
  
  
Bool DoCopy( BaseDocument* doc )  
{  
Clipboard* clip = GetClipboard();  
if( !clip ) return TRUE;  
  
AutoAlloc<AtomArray> active;  
doc->GetActivePolygonObjects( *active, TRUE );  
if( active->GetCount()>0 )  
{  
    ModelingCommandData md;  
    md.op = NULL;  
    md.arr = active;  
    md.doc = doc;  
    md.result = NULL;  
    md.mode = 0;  
    md.flags = 0;  
    md.result = NULL;  
    SendModelingCommand( MCOMMAND_SPLIT, md );   
    clip->TakeObjects( md.result );  
}  
else clip->TakeObjects( NULL );  
return TRUE;  
}  
  
  
class MenuTest : public CommandData  
{  
     public:  
          virtual Bool Execute(BaseDocument *doc);  
};  
  
Bool MenuTest::Execute(BaseDocument *doc)  
{  
DoCopy( doc );  
     return TRUE;  
}  
  
Bool RegisterMenuTest(void)  
{  
     // decide by name if the plugin shall be registered - just for user convenience  
     String name=GeLoadString(IDS_MENUTEST); if (!name.Content()) return TRUE;  
     // be sure to use a unique ID obtained from www.plugincafe.com  
     return RegisterCommandPlugin(1000956,name,0,"icon.tif","C++ SDK Menu Test Plugin",gNew MenuTest);  
}  
  
  
//In main.cpp:  
  
void FreeClipboard();  
  
void PluginEnd(void)  
{  
FreeClipboard();  
}  
  

This code can crash reproducable when you do the following:

Create c4d_debug.txt file, so C4d runns in debug mode.
Run C4d.
Make a cube.
Make Editable.
Make a HNWeightTag ( use hn weight tool on some edges )
Select some polys
Call the plug
Quite Cinema
...
BOOM... wtf..

it only crashes if you run in debug mode, and have the HN tag. I suspect some memory becomes corrupted somehow.

Okay this crash happens when you quit. But i'm also having other crashes which are harder to reproduce.

I have no idea what is going on. Help ??!!

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 11/08/2006 at 12:31, xxxxxxxx wrote:

hmm... if i use this...

  
void Clipboard::TakeObjects( AtomArray* a )  
{  
if( !array ) return;  
array->FilterObjectChildren();  
for( LONG i=0; i<array->GetCount(); ++i )  
{  
    BaseObject* op = static_cast<BaseObject*>( array->GetIndex(i) );  
    BaseObject::Free( op );  
}   
array->Flush();  
GeAssert( array->GetCount()==0 );  
if( a ) a->CopyTo( array );  
for( LONG i=0; i<array->GetCount(); ++i )  
{  
    BaseObject* op = static_cast<BaseObject*>( array->GetIndex(i) );  
    BaseTag *t;  
    while( t = op->GetTag( Tsds ) )  
    {  
      t->Remove();  
      BaseTag::Free( t );  
    }  
}  
}  

... the entire plug appears to work just fine.

best regards
Michael

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On 17/08/2006 at 23:59, xxxxxxxx wrote:

bump

uhm.. mikael, can you reproduce ?

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On 18/08/2006 at 14:05, xxxxxxxx wrote:

Sorry, I thought that the last piece of code you posted was a fix. Perhaps I should take the time to actually read this thread through now...

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 19/08/2006 at 10:21, xxxxxxxx wrote:

Yes please check it out. The code is no fix, it removes the HNWeight-Tags which seem to cause the problems. It should work with all kind of tags though.

Thanks

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On 28/08/2006 at 01:31, xxxxxxxx wrote:

You should use:

C4DPL_ENDACTIVITY

in PluginMessage otherwise (from the sdk docs) :

Sent to all plugins before any PluginEnd() has been called. This allows you to close dialogs, end threads, delete temporary/undo buffers etc. In PluginEnd() it might crash as some resources from other plugins might already be freed.

HTH.

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On 28/08/2006 at 02:53, xxxxxxxx wrote:

Thanks David.