How do I get the user name of the current user?

Question

I want to access the user name in the Windows using C programming and use that name to create the path to the particular file like \"c:\\users\\john\\Roaming.....and so on\"

Answer 1

What you are looking for, here, is probably more SHGetKnownFolderPath. The function lets you find per-user special folders. This is preferred to querying usernames because the home folder may not have the same name as the user.

WSTR* location;
HRESULT hr = SHGetKnownFolderPath(FOLDERID_RoamingAppData, 0, NULL, &location);
if (SUCCEEDED(hr))
{
    // location contains the folder path
    // call CoTaskMemFree to free up the memory once you're done with it
    CoTaskMemFree(location);
}

The list of so-called known folders is available here.