Memory Leak on OLE Strings

When investigating memory leaks problems that involves OLE Strings (E.x.: BSTR, CComVariant, etc…), be aware that by default Windows caches strings created by SysAllocString and freed by SysFreeString functions to increase the overall COM/DCOM performance. This makes false leaks on memory leaks tools (E.g.: DebugDiag).

To disable the cache of the OLE strings, you can introduce following Environment variable.


If you are running the tests over a Windows service (E.g.: IIS), be sure you restart the computer for the changes to take effect.

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