Salesforce Developer Community

I have a requirement to get UserName from sforce Through API.

I am unable to find the option to get UserName.

I can able to get userEmail,UserID,UserFullName using getUserInfo() function which will return GetUserInfoResult object

GetUSerInfoREsult object is not having USerName.

Please help me how can i get username ( i don't want to pass the username as a querystring parameter)

Thanks,

Mohan