Trying to get Terminal Server Session Info with Win32::API library

[Morgan, Steve H.]

Purpose: I am trying to gather connection information from Terminal Server across our enterprise. Microsoft has released docs for there wtsapi32.dll which will provide this information.   Problem: The function WTSEnumerateSessions returns a pointer to an array of structures. The variable that receives the return value from the function call gets the address as a value rather than a memory pointer.     Here is some detail,   Step 1. Obtain a handle to the server that I want to query.         Function to use: HANDLE WTSOpenServer(LPTSTR pServerName);   My $WTSOpenServer = new Win32::API("wtsapi32.dll", "WTSOpenServer",[P],N)     Or die 'Find WTSOpenServer: ' . ErrMsg (); My $hServer = $WTSOpenServer->Call('SOMESERVERNAME')     Or die 'Call WTSOpenServer: ' . ErrMsg ();   Step 2. Call the EnumerateSession Function with handle and get pointer to array of sessions   my $SessionInfo = pack 'A*',"\x00" x 16; my $Count = pack 'I',0; my $WTSEnumerateSessions = new Win32::API('wtsapi32.dll', 'WTSEnumerateSessions',[qw(N N N P P)],'I')     or die 'Find WTSEnumerateSessions: ' . ErrMsg ();   my $rv = $WTSEnumerateSessions->Call($hServer,0,1,$SessionInfo,$Count); die 'Call WTSEnumerateSessions: ' . ErrMsg () if (!$rv);   Step 3. Print out the contents of the SessionInfo Array of structures.         There is where I do not know where to go.     Prototypes from Microsoft:    BOOL WTSEnumerateSessions(      HANDLE hServer,      DWORD Reserved,      DWORD Version,  >>>>PWTS_SESSION_INFO* ppSessionInfo,      DWORD* pCount    );    This function takes five parameters; the first three are straight  forward.   >hServer - is a handle to an open session. This one works fine >Reserved - Version - must be 1    The next two are variables will return the address of the data.    If the Return ppSessionInfo is a pointer, would I get at the values  like this? This does not seem to work.    my ($SessionID,$StationName,$State) = unpack("IPI",$SessionInfo);    The pointer returns an array of these structures.   > typedef struct _WTS_SESSION_INFO { >     DWORD SessionId; >     LPTSTR pWinStationName; >     WTS_CONNECTSTATE_CLASS State; >     } WTS_SESSION_INFO, *PWTS_SESSION_INFO;