Obtained current logon user name in Windows

We had an application to retreive current logon user name in Windows. Since our application is an HTTP proxy, there are two approaches:

(1) Obtain user name using TCP connection
a). tcptable=GetExtendedTcpTable(...)
b). Get the process id of the socket
    foreach(tcptable->dwNumEntries)
            if (tcptable->table[i].dwLocalPort==port)
                processid=tcptable->table[i].dwOwningpid;
c). Open process to get the process token
    hrpocess=OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, processid)
    OpenProcessToken(hprocess, TOKEN_QUERY, &hToken)
d) Then use the token to user info
    GetTokenInformation(hToken, TokenUser, PUserInfo, dwSize, &dwSize)
e) Look up the user name from the user info
    LookupAccountSidW(NULL, pUserInfo->User.sid, Name, &dwSize, lpDomain, &dwSize, &SidType)


(2) Obtain the user name using active session
a) enumerate the sessions
   WTSEnumerateSessions(WTS_CURRENT_SERVER_HANDLE, 0 ,1, &pSessionInfo, &dwCount)
b) foreach dwCount
        if (pSessionInfo[i].State==WTSActive)
              dwSessionId=pSessionInfo[i].SessionId;
c). Then query the user token use the session id
      WTSQueryUserToken(dwSessionId, &hToken) 
After that following the d) and e) in approach (1)