Send AUX Write CMD and aux_info.dwSize =0 is Error

[chongmin]

If i want send 40 00 65 00 95 we can write

aux_info.dwDeviceUID = uidMonitor;
aux_info.dwOpType = 4;
aux_info.dwSize = 1;
aux_info.dwAddress = 0x65;
aux_info.Data[0] = 0x95;
HRESULT hr = pCUIExternal8->SetDeviceData((GUID*)&IGFX_GET_SET_AUX_INFO_GUID,sizeof(aux_info), (BYTE*)&aux_info, &dwError);

how can we write AUX CMD 00 00 65

THX