How can I get the username of the process owner (the user who is executing my program) in C++?
+2
A:
IDK, but in a batch file you can use %username%. if its windows, and you only need to echo it, then
system("echo %username%"); i believe
hintss
2010-02-03 02:31:17
I could use that but I was looking for more of an non-batch anwser, lol +1 for good anwser though!
H4cKL0rD
2010-02-03 02:41:20
also works for %computername%
hintss
2010-02-03 06:17:31
Jesus Christ, how does this have +3? All it does is echo the username, not return it, and this code wouldn't even compile!
Charlie Somerville
2010-02-03 08:14:04
You can also modify environment variables. I can do `set USERNAME=foo` whenever I want, but it doesn't change who I'm logged in as.
Graeme Perrow
2010-02-03 11:53:20
add quotes? did i miss those?i used C++ a while back, but before that, I wrote many, many, overcomplicated batch files. Who Am I, an installer, and a copy protection scheme were just the beginingleme edit
hintss
2010-02-05 06:42:30
+1
A:
This is specific to the operating system. On Windows, use GetUserName. On unix, use getuid.
Graeme Perrow
2010-02-03 02:33:11
The question is about the local user name, not the computer name.
Matthew Flaschen
2010-02-03 02:33:47
+17
A:
Windows
Example:
char user_name[UNLEN+1];
DWORD user_name_size = sizeof(user_name);
if (GetUserName(user_name, &user_name_size))
cout << "Your user name is: " << user_name << endl;
else
/* Handle error */
Linux
Look at getpwuid:
The getpwuid() function shall search the user database for an entry with a matching uid.
The getpwuid() function shall return a pointer to a struct passwd
The struct passwd will contain char *pw_name.
Use getuid to get the user id.
Andreas Bonini
2010-02-03 02:34:26
Woah, 7 votes in 2 minutes.. Must be the new stuffed owl avatar :)
Andreas Bonini
2010-02-03 02:38:12
If you want to hard-code a buffer size, use 257 (UNLEN+1) this is the documented max size for a username on windows
Anders
2010-02-03 13:46:58
A:
It is not a C++ related question. You can find information (not 100% sure) in the environment variables when using UNIX like systems. You can also use the 'id' program on these systems.
In general, the fastest way is to make a platform-dependent kernel / API call.
On windows under cmd.exe the USERNAME environment variable holds the username (which is also informational not factual). Search in WINAPI documentation for precise.
Notinlist
2010-02-03 02:36:23
@Notinlist: what do you mean it's not a C++ related question? He's using C++. This makes the question C++ related. Maybe you come from places where "C++ related" means only standard C++ (such as #[email protected]), but here on SO this is considered very in topic :)
Andreas Bonini
2010-02-03 16:43:34
A:
On windows, a thread can be impersonated, a process can not. To get the process owner you should call GetTokenInformation with the TokenUser infoclass on your process token, this will give you a SID, this SID can be converted to a username with LookupAccountSid. If you don't care about thread vs process, GetUserName() is fine.
Anders
2010-02-03 13:38:39