VC9: What does USES_CONVERSION do?

USES_CONVERSION Is a macro and when we are using String conversion like OLE2T, T2W etc than we can add this macro at the beginning of function or before conversion to avoid compiler errors.

If you are using ATL7.0 than no need to use this macro.

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As you can see from the definition:

#define USES_CONVERSION int _convert = 0; (_convert); UINT _acp = ATL::_AtlGetConversionACP() /*CP_THREAD_ACP*/; (_acp); LPCWSTR _lpw = NULL; (_lpw); LPCSTR _lpa = NULL; (_lpa)

its just initialization for other macros...