Get current username in C++ on Windows

Question

I am attempting to create a program that retrieves the current user's username on Windows using C++.

I tried this:

char *userName = getenv("LOGNAME");
stringstream ss;
string userNameString;
ss << userName;
ss >> userNameString;
cout << "Username: " << userNameString << endl;

Nothing is outputted except "Username:".

What is the simplest, best way to get the current username?

Answer 1

Use the Win32API GetUserName function. Example:

#include <windows.h>
#include <Lmcons.h>

char username[UNLEN+1];
DWORD username_len = UNLEN+1;
GetUserName(username, &username_len);

Answer 2

Corrected code that worked for me:

TCHAR username[UNLEN + 1];
DWORD size = UNLEN + 1;
GetUserName((TCHAR*)username, &size);

I'm using Visual Studio Express 2012 (on Windows 7), maybe it works the same way with Dev-Cpp

Answer 3

On windows use USERNAME enviroment variable or GetUserName function

Answer 4

It works:

#include <iostream>
using namespace std; 

#include <windows.h>
#include <Lmcons.h>

int main()
{
TCHAR name [ UNLEN + 1 ];
DWORD size = UNLEN + 1;

if (GetUserName( (TCHAR*)name, &size ))
wcout << L"Hello, " << name << L"!\n";
else
cout << "Hello, unnamed person!\n";
}

Answer 5

You should use the env variable USERNAME.