C++检查设备驱动状态

bool IsDeviceDisabled(DWORD dwDevID, HDEVINFO hDevInfo, DWORD &dwStatus)
{
    SP_DEVINFO_DATA DevInfoData = {sizeof(SP_DEVINFO_DATA)};
    DWORD    dwDevStatus,dwProblem;
    if(!SetupDiEnumDeviceInfo(hDevInfo,dwDevID,&DevInfoData))
    {
        return FALSE;
    }

    //查询设备状态
    if(CM_Get_DevNode_Status(&dwDevStatus,&dwProblem,DevInfoData.DevInst,0)!=CR_SUCCESS)
    {
        return FALSE;
    }

    dwStatus = dwProblem;
//    return ( (dwProblem == CM_PROB_FAILED_INSTALL));

    return true;
}

int  IsInstallDriver()
{
    HDEVINFO hDevInfo;
    SP_DEVINFO_DATA DeviceInfoData;
    DWORD i;
    bool bRet = false;
    bool bOk = false;

      //step1. Create a HDEVINFO with all present devices.
    hDevInfo = SetupDiGetClassDevs(NULL,
        0, // Enumerator
        0,
        DIGCF_PRESENT | DIGCF_ALLCLASSES );

    if (hDevInfo == INVALID_HANDLE_VALUE)
    {
        // Insert error handling here.
        return bRet;
    }


    DWORD dwStatuts = -1;
    //step2. Enumerate through all devices in Set.
    DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
    for (i=0; SetupDiEnumDeviceInfo(hDevInfo, i, &DeviceInfoData); i++)
    {
        DWORD DataT;
        LPTSTR buffer = NULL;
        DWORD buffersize = 0;

        // Call function with null to begin with,
        // then use the returned buffer size
        // to Alloc the buffer. Keep calling until
        // success or an unknown failure.
        //
        while (!SetupDiGetDeviceRegistryProperty(
            hDevInfo,
            &DeviceInfoData,
            SPDRP_HARDWAREID,
            &DataT,
            (PBYTE)buffer,
            buffersize,
            &buffersize))
        {
            if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
            {
                // Change the buffer size.
                if (buffer) LocalFree(buffer);
                buffer = (LPTSTR)LocalAlloc(LPTR,buffersize);
            }
            else
            {
                // Insert error handling here.
                break;
            }
        }

        printf("%S\n", buffer);
        //step3. find devices status
        if (buffer && (!wcscmp(buffer,L"USB\\Vid_0955&Pid_7103") || !wcscmp(buffer,L"USB\\Vid_0955&Pid_7102")) )
        {

            if (IsDeviceDisabled(i, hDevInfo, dwStatuts) && dwStatuts == 0)
            {

            }
            //printf( "SPDRP_DEVICEDESC:[%S] %d\n ",buffer, dwStatuts);

            if (buffer)
                LocalFree(buffer);
            break;
        }

        if (buffer)
            LocalFree(buffer);
    }

    // step4. Cleanup
    SetupDiDestroyDeviceInfoList(hDevInfo);

    return dwStatuts;
}