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