Dear Rooters, I have tried to implement a example by Fons Rademakers, on how to control the closing of a canvas window. My code segment looks like this: bool Global::CanvasOpen(char* name, char* title, Int_t dx, Int_t dy) { if (!rootapp) rootapp = new TApplication("EVA", 0, 0); c = new TCanvas(name,title,dx,dy); /* have added this: */ rc = (TRootCanvas*)c->GetCanvasImp(); rc->Connect("CloseWindow()", 0, 0, "monitorClose()"); //Crashes here return 0; } void monitorClose() { // todo } This was working fine without the rc->... statements. When I try to open a Canvas the application crashes at the indicated statement (rc is previously declared as TRootCanvas*). The message of the debugger is: Unhandeled access violation in evamfc2.exe (LIBCORE.DLL): 0xC0000005: Access Violation Note that I'm using root and mfc in a VC++6 environment. Any suggestions? Dimitris
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