SetupDiGetClassDevs
HDEVINFO hDevInfo = INVALID_HANDLE_VALUE;
hDevInfo = SetupDiGetClassDevs((LPGUID) &GUID_SDML_USB, 0, 0,DIGCF_PRESENT);
HDEVINFO hDevInfo = INVALID_HANDLE_VALUE;
hDevInfo = SetupDiGetClassDevs((LPGUID) &GUID_SDML_USB, 0, 0,DIGCF_PRESENT);
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