Convert CComSafeArray to java byte array containing hexa deciamals

EDIT: I know how to create byte array in jni but here i want to convert the CComsafeArray to the byte array.! And the byte array contains a hexadeciamal values. I wrote a native function which has the byte array which is a info of a image.I want to send this byte array to java using jni. Where i can convert the byte array to image there.

{
    IADsUser* pUser;
    CoInitialize(NULL);
    CComBSTR  path = L"LDAP://WIN-F94H2MP3UJR.Test.local/CN=Someone,CN=Users";
    path += L",DC=Test,DC=local";
    HRESULT hr = ADsOpenObject(path, L"Administrator", L"pass@12",
        ADS_SECURE_AUTHENTICATION, // For secure authentication
        IID_IADsUser,
        (void**)&pUser);
    if (FAILED(hr)) { return NULL; }
    VARIANT  var;
    hr = pUser->get_Picture(&var);
    if (SUCCEEDED(hr)) {
        SAFEARRAY* d = var.parray;
        CComSafeArray<BYTE> sa(d);
        const LONG lb = sa.GetLowerBound();
        const LONG ub = sa.GetUpperBound();
        VARTYPE dataTypeStored = sa.GetType(); // Returns 17 which is the type for bytes.

    }
    return hr;
}

the sa is the byte array which i have to pass to java. I Researched a lot and couldn't found any. Any help will be useful.