How to find user name from the session ID?

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I have an user win32 application . That enumerates all the process details along with ProcessId. I need to print the User name along with the session ID. SessionID is enumerated using ProcessIdToSessionId() method. I want to print the User name of corresponding SessionID. This application is specially designed for WindowsXP , so the API should support WindowsXP. If anyone knows the solution please share it.

What I have tried:

DWORD dwSessionId,dwPid,dwErr;
char* Uname;
ProcessIdToSessionId(dwPid,&dwSessionId);

Posted 12-Jan-17 19:27pm

MarshalS

Updated 12-Jan-17 20:02pm

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Jochen Arndt · Answer 1 · 2017-01-12T20:02:00

Why would you want to use the Session ID when you have the Process ID? Use that to get the user name.

Using the process ID returned by ProcessIdToSessionId might not work as already mentioned in my previous answer C++ code to print all process with session ID[^]:

Quote:
Remarks
If the calling process is not running in a Terminal Services environment, the value returned in pSessionId is zero

The above is from an old SDK and applies to Windows versions up to XP. Assuming that you are not executing your XP application in a Terminal Service, the Session ID will be always zero.

To get the name from the Process ID see these functions (or serach the web for example code):
OpenProcessToken function (Windows)[^]
GetTokenInformation function (Windows)[^] (with class TokenOwner to get the user's SID)
LookupAccountSid function (Windows)[^]