void PrintLastError()
{
    LPWSTR lpMsgBuf;
    DWORD dw = GetLastError();

    FormatMessageW(
        FORMAT_MESSAGE_ALLOCATE_BUFFER |
        FORMAT_MESSAGE_FROM_SYSTEM |
        FORMAT_MESSAGE_IGNORE_INSERTS,
        NULL,
        dw,
        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
        (LPWSTR)&lpMsgBuf,
        0, NULL );

    printf("%S", lpMsgBuf);

    LocalFree(lpMsgBuf);
}