Hi, in my usual environment (Win2k, MSVC6, linking root against my own main()) I (and other colleagues) occasionally get an access violation in libGpad. Thanks to the debug distribution I could track that problem down to the following bug: When opening a new TCanvas aparently a windows message "MouseMove" can be issued without "fSelected" being properly initialized (TCanvas::fSelected is "0xbaadf00d"), which results in a access violation in TObject::TestBit(). Here's the stack of that call (lines corresponding to debug vers 3.01/03): TObject::TestBit(unsigned int 33554432) line 169 + 10 bytes TCanvas::HandleInput(EEventType kMouseMotion, int 551, int 250) line 948 + 31 bytes TGWin32WindowsObject::OnMouseButton(TGWin32WindowsObject * const 0x014cbd30, HWND__ * 0x001e08de, unsigned int 512, unsigned int 0, long 16384551) line 673 TGWin32WindowsObject::OnMouseButtonCB(TGWin32Object * 0x014cbd30, HWND__ * 0x001e08de, unsigned int 512, unsigned int 0, long 16384551) line 165 + 31 bytes TWin32CallBackList::operator()(HWND__ * 0x001e08de, unsigned int 512, unsigned int 0, long 16384551) line 137 + 29 bytes TGWin32Object::CallCallback(HWND__ * 0x001e08de, unsigned int 512, unsigned int 0, long 16384551) line 432 WndROOT(HWND__ * 0x001e08de, unsigned int 512, unsigned int 0, long 16384551) line 94 + 24 bytes Could somebody please fix that? It's very annoying... I can't really believe this access violation is caused by windows, as it even occurs when I don't move the mouse at all (from when I start my program until it crashes). So my guess would be that some class is sending this event "by accident", e.g. because its event list is not properly initialized... Or maybe just initializing fSelected with NULL is good enough. I'm willing to help tracking this problem down - as I said, it's reproduced by colleagues of mine (actually by everybody I know who is using root on win), and it means you can't plot anything. O, and it's an old problem, happens since Root version 2.something. By the way: Does anybody know where members are initialized to "0xbaadf00d"? I can't find it anywhere in the root source... Thanks, Axel.
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