Occasionally an application execution depends on installed devices. For example, USB memory card might be needed for storing/reading application specific files. But how do we know that such device is inserted/installed on the system?

Below is the code that enumerates all installed devices on a windows system.

HDEVINFO hInfoList = ::SetupDiGetClassDevs(NULL, NULL, NULL,
        DIGCF_PRESENT | DIGCF_ALLCLASSES | DIGCF_PROFILE);
if(hInfoList != INVALID_HANDLE_VALUE)
{
    SP_DEVINFO_DATA spdid;
    spdid.cbSize = sizeof(SP_DEVINFO_DATA); 

    DWORD dwIndex = 0;
    while(::SetupDiEnumDeviceInfo(hInfoList, dwIndex, &spdid))
    {
        CString strEntry = _T(""); 

        TCHAR szName[4096] = {0}; 

        if(::SetupDiGetClassDescription(&spdid.ClassGuid, 
                                        szName, 
                                        4096, 
                                        NULL))
        strEntry += szName;
        strEntry += " | "; 

        if(::SetupDiGetDeviceRegistryProperty(hInfoList, &spdid, SPDRP_DEVICEDESC, 0,
            (PBYTE)szName, 4096, 0))
        {
            strEntry += szName;
        }
        
        strEntry += " | "; 

        if(::SetupDiGetDeviceRegistryProperty(hInfoList, 
                &spdid, SPDRP_FRIENDLYNAME, 0, 
                (PBYTE)szName, 4096, 0))
        {
            strEntry += szName;
        } 

        m_DevList.AddString(strEntry); 

        ++dwIndex;
    }
} 

::SetupDiDestroyDeviceInfoList(hInfoList);