http://support.microsoft.com/kb/125749


Calling a pure virtual function is a programming error, so you need to find the call to the pure virtual function and rewrite the code so it is not called.

One way to find a call to a pure virtual function is to replace the pure virtual function with an implementation that calls the Windows API function DebugBreak. When using the debugger, DebugBreak will cause a hard-coded breakpoint. When the code stops running at this breakpoint, you can view the callstack to see where the function was called.

Another way to find a call to a pure virtual function is to set a breakpoint on the _purecall function that is found in PureVirt.c. Breaking on this function has the advantage of keeping the stack intact so that you can trace what is occurring.