예전에 어느분이 질문하셨던 내용인데,
아무도 답변이 없었던 내용입니다.

저도 관련 프로그램을 하려고 찾아보다가 DDK sample에서 해답을 얻었습니다.

관련함수 :
    hDevInfo = SetupDiGetClassDevs(...);
    SetupDiEnumDeviceInfo(...);
    CM_Get_DevNode_Status(...);
    SetupDiGetDeviceRegistryProperty(...);
등등

HELP : DDK HELP

해더파일 : 아래의 순서로 선언하세요..
    #include <windows.h>  // Most Windows functions
    #include <cfgmgr32.h> // Used for CM_Xxxx functions
    #include <vcl.h>

참조 : WINXP DDK 의 setup\enable 소스참조..

아래는 빌더로 약간 수정한 일부 소스입니다..참조하세요.
BOOL IsClassHidden( GUID * ClassGuid )
{
    BOOL bHidden = FALSE;
    HKEY hKeyClass;

    //
    // If the devices class has the NoDisplayClass value then
    // don't display this device.
    //
    if (hKeyClass = SetupDiOpenClassRegKey(ClassGuid,KEY_READ))
    {
        bHidden = (RegQueryValueEx(hKeyClass,
            REGSTR_VAL_NODISPLAYCLASS,
            NULL, NULL, NULL, NULL) == ERROR_SUCCESS);
        RegCloseKey(hKeyClass);
    }

    return bHidden;
}


BOOL GetRegistryProperty(HDEVINFO  DeviceInfoSet,
                         PSP_DEVINFO_DATA  DeviceInfoData,
                         ULONG Property,
                         PVOID Buffer,
                         PULONG Length)
{
BOOL state;
DWORD errdata;

    while (1)
    {
        state=SetupDiGetDeviceRegistryProperty(DeviceInfoSet,
                DeviceInfoData,
                Property,
                NULL,
                (PBYTE)Buffer,
                *Length,
                Length);
        if(state) break;

        errdata=GetLastError();
        if (errdata == ERROR_INSUFFICIENT_BUFFER)
        {
            //
            // We need to change the buffer size.
            //
//            if ((char *)Buffer)
//                LocalFree((char *)Buffer);

//            (char *)Buffer = (char *)LocalAlloc(LPTR,*Length);
        }
        else
        {
            //
            // Unknown Failure.
            //
//            if (errdata != ERROR_INVALID_DATA)
//               DisplayError(TEXT("GetDeviceRegistryProperty"));
            return FALSE;
        }
    }

    return ((char *)Buffer)[0];
}

#define UnknownDevice TEXT("<Unknown Device>")
BOOL ConstructDeviceName( HDEVINFO DeviceInfoSet,
                          PSP_DEVINFO_DATA DeviceInfoData,
                          PVOID Buffer,
                          PULONG Length)
{
    if (!GetRegistryProperty(DeviceInfoSet,
        DeviceInfoData,
        SPDRP_FRIENDLYNAME ,
        Buffer,
        Length))
    {
        if (!GetRegistryProperty(DeviceInfoSet,
            DeviceInfoData,
            SPDRP_DEVICEDESC ,
            Buffer,
            Length))
        {
            if (!GetRegistryProperty(DeviceInfoSet,
                DeviceInfoData,
                SPDRP_CLASS ,
                Buffer,
                Length))
            {
                if (!GetRegistryProperty(DeviceInfoSet,
                    DeviceInfoData,
                    SPDRP_CLASSGUID ,
                    Buffer,
                    Length))
                {
//                     *Length = (_tcslen(UnknownDevice)+1)*sizeof(TCHAR);
//                     *(LPTSTR *)Buffer = *(LPTSTR *)LocalAlloc(LPTR,*Length);
                     _tcscpy((char *)Buffer,UnknownDevice);
                }
            }
        }
    }
    return TRUE;
}


void __fastcall TForm1::Button2Click(TObject *Sender)
{
char DevStr[10000];
ULONG DevStrMax;
char S[100];
DWORD i, Status, Problem;
TV_INSERTSTRUCT tvInsertStruc;
SP_DEVINFO_DATA DeviceInfoData = {sizeof(SP_DEVINFO_DATA)};

    if (INVALID_HANDLE_VALUE == (hDevInfo =
            SetupDiGetClassDevs(NULL,NULL,Form1->Handle,
            DIGCF_PRESENT|DIGCF_ALLCLASSES)))
    {
        MessageBox(NULL,"ERR","MSG",MB_OK);
    }

    for(i=65;i<110;i++)
    {
        SetupDiEnumDeviceInfo(hDevInfo,i,&DeviceInfoData);
        if (CR_SUCCESS != CM_Get_DevNode_Status(&Status, &Problem,
                    DeviceInfoData.DevInst,0))
        {
            MessageBox(NULL,"ERR","MSG",MB_OK);
            return;
        }

        if (!(ShowHidden || !((Status & DN_NO_SHOW_IN_DM) ||
            IsClassHidden(&DeviceInfoData.ClassGuid))))
        {
            continue;
        }
   
        wsprintf(S,"%08lX %04X %04X %02X %02X %02X %02X %02X %02X %02X %02X"
                    ,DeviceInfoData.ClassGuid.Data1
                    ,DeviceInfoData.ClassGuid.Data2
                    ,DeviceInfoData.ClassGuid.Data3
                    ,DeviceInfoData.ClassGuid.Data4[0]
                    ,DeviceInfoData.ClassGuid.Data4[0]
                    ,DeviceInfoData.ClassGuid.Data4[0]
                    ,DeviceInfoData.ClassGuid.Data4[0]
                    ,DeviceInfoData.ClassGuid.Data4[0]
                    ,DeviceInfoData.ClassGuid.Data4[0]
                    ,DeviceInfoData.ClassGuid.Data4[0]
                    ,DeviceInfoData.ClassGuid.Data4[0]
                    );
        Memo1->Lines->Add(S);
        ConstructDeviceName( hDevInfo,&DeviceInfoData,
    //            &tvInsertStruc.item.pszText,
    //            &tvInsertStruc.item.cchTextMax);
                DevStr,
                &DevStrMax);
        wsprintf(S,"%lu : %s %lu",i,DevStr,DevStrMax);
        Memo1->Lines->Add(S);
        Label1->Caption=S;
    }

}