How to get logged-in user's full name in windows?

Question

How to get logged-in user\'s full name (the one he/she entered as his/her real name) using windows API or something else? For example how to get \"John Smith\", not \"john\"

Answer 1

I have found some places in windows registry with my email or my full name:

1. HKEY_CURRENT_USER\Software\Microsoft\Office\Common\UserInfo has UserName which contains my full name.
2. KEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer has Logon User Name which contains my email.
3. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon has DefaultUserName which contains my email.

The first one obviously requires Microsoft Office to be installed and that the user has entered his/her name in the Office settings. The second and the third are more reliable but contains email instead but email is also good (or better) identification than full name.