_ATL_DEBUG_QI
Writes all calls to QueryInterface to the output window.
#define _ATL_DEBUG_QI
Remarks
If a call to QueryInterface failed, the output window will display:
interface name - failed
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Writes all calls to QueryInterface to the output window.
#define _ATL_DEBUG_QI
If a call to QueryInterface failed, the output window will display:
interface name - failed