Need help with my subroutine in C++

Hello

I tried to convert the following from VBS to C++. I keep getting error "Failed to Initialize COM. Error code = 0x80010106" on my CoInitializeEx(NULL, COINIT_MULTITHREADED) call. What do I do wrong?
Thanks in advance for any help.

Code:

strComputer = "."

Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\cimv2")
Set colItems = objWMIService.ExecQuery("Select * from SoftwareLicensingProduct")

For Each objItem in colItems
    If NOT objItem.ProductKeyID = "null" Then
        Wscript.Echo "Extend PID: " & objItem.ProductKeyID
        Wscript.Echo "Windows Family: " & objItem.LicenseFamily
        Wscript.Echo "Windows Type: " & objItem.ProductKeyChannel
        Wscript.Echo "Activation ID: " & objItem.ID
        Exit For
    End If
Next

My function in C++:

Code:

private: std::string GetActIDFromSystem()
    {
        HRESULT hres;
        hres = CoInitializeEx(NULL, COINIT_MULTITHREADED);

        if (FAILED(hres))
        {
            //std::string format_error(unsigned __int32 hres);
            std::stringstream ss;
            ss << "Failed to Initialize COM. Error code = 0x" << std::hex << hres << std::endl;
            return ss.str();
        }

        hres = CoInitializeSecurity(NULL, -1, NULL, NULL, RPC_C_AUTHN_LEVEL_DEFAULT, RPC_C_IMP_LEVEL_IMPERSONATE, NULL, EOAC_NONE, NULL);

        if (FAILED(hres))
        {
            CoUninitialize();
            //std::string format_error(unsigned __int32 hres);
            std::stringstream ss;
            ss << "Failed to initialize security. Error code = 0x" << std::hex << hres << std::endl;
            return ss.str();
        }

        IWbemLocator *pLoc = NULL;
        hres = CoCreateInstance(CLSID_WbemLocator, 0, CLSCTX_INPROC_SERVER, IID_IWbemLocator, (LPVOID *)&pLoc);

        if (FAILED(hres))
        {
            CoUninitialize();
            //std::string format_error(unsigned __int32 hres);
            std::stringstream ss;
            ss << "Failed to create IWbemLocator object. Error code = 0x" << std::hex << hres << std::endl;
            return ss.str();
        }

        IWbemServices *pSvc = NULL;

        // Connect to the root\cimv2 namespace with
        // the current user and obtain pointer pSvc
        // to make IWbemServices calls.
        hres = pLoc->ConnectServer(_bstr_t(L"ROOT\\CIMV2"), NULL, NULL, 0, NULL, 0, 0, &pSvc);

        if (FAILED(hres))
        {
            pLoc->Release();
            CoUninitialize();
            //std::string format_error(unsigned __int32 hres);
            std::stringstream ss;
            ss << "Could not connect. Error code = 0x" << std::hex << hres << std::endl;
            return ss.str();
        }

        //cout << "Connected to ROOT\\CIMV2 WMI namespace" << endl;

        hres = CoSetProxyBlanket(pSvc, RPC_C_AUTHN_WINNT, RPC_C_AUTHZ_NONE, NULL, RPC_C_AUTHN_LEVEL_CALL, RPC_C_IMP_LEVEL_IMPERSONATE, NULL, EOAC_NONE);

        if (FAILED(hres))
        {
            pSvc->Release();
            pLoc->Release();
            CoUninitialize();
            //std::string format_error(unsigned __int32 hres);
            std::stringstream ss;
            ss << "Could not set proxy blanket. Error code = 0x" << std::hex << hres << std::endl;
            return ss.str();
        }

        // For example, get the name of the operating system
        IEnumWbemClassObject* pEnumerator = NULL;
        hres = pSvc->ExecQuery(bstr_t("WQL"), bstr_t("SELECT * FROM SoftwareLicensingProduct"),
            WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, NULL, &pEnumerator);

        if (FAILED(hres))
        {
            pSvc->Release();
            pLoc->Release();
            CoUninitialize();
            //std::string format_error(unsigned __int32 hres);
            std::stringstream ss;
            ss << "Query for SoftwareLicensingProduct failed. Error code = 0x" << std::hex << hres << std::endl;
            return ss.str();
        }

        IWbemClassObject *pclsObj = NULL;
        ULONG uReturn = 0;

        while (pEnumerator)
        {
            HRESULT hr = pEnumerator->Next(WBEM_INFINITE, 1, &pclsObj, &uReturn);

            if (0 == uReturn)
            {
                break;
            }

            VARIANT vtProp;

            // Get the value of the Name property
            hr = pclsObj->Get(L"ProductKeyID", 0, &vtProp, 0, 0);
            std::stringstream ss;
            ss << vtProp.bstrVal;
            VariantClear(&vtProp);

            pclsObj->Release();
        }

        // Cleanup
        // ========
        pSvc->Release();
        pLoc->Release();
        pEnumerator->Release();
        CoUninitialize();
        return "0";
    }

 

Thank you for your answer. I tried that, but did get an error on CoInitializeSecurity. I disabled that part of code and then it worked.