Getting the Windows User Name in LabVIEW

Solution

There are three methods could be used to retrieve Windows username in LabVIEW.

If you only need the Windows username, then the following instruction will suffice:

In the block diagram, place a VI Server Reference.
Click the VI Server Reference, then select This Application.
Connect the output reference to a property node.
Click the property node to select Application>>User Name
Connect a string indicator to the property's output to display the user name.

Note: This image is a LabVIEW snippet, which includes LabVIEW code that you can reuse in your project. To use a snippet, right-click the image, save it to your computer, and drag the file onto your LabVIEW diagram.

If you would like to include the domain along with the Windows username in the resulting string, then the following instruction will be best:

Insert an Invoke Node (.NET) into the block diagram
Right-click the invoke node and select Select Class>>.NET Framework>>Browse
In the Select Object from Assembly window, select mscorlib from the Assembly drop-down menu
Scroll down the Objects list and double-click the System.Security.Principal to expand it
Select WindowsIdentity and click OK
Right-click the invoke node and select Select Method>>[S]GetCurrent()
Connect a property node to the reference output of the GetCurrent method
Right-click the property node and select Select Property>>Name
Connect a string indicator to the property's output to display the user name with domain information

Note: This image is a LabVIEW snippet, which includes LabVIEW code that you can reuse in your project. To use a snippet, right-click the image, save it to your computer, and drag the file onto your LabVIEW diagram.

It is possible to use System Exec.vi to obtain the username with the domain information

Place a System Exec.vi in the block diagram
Insert whoami command into the its command line input.
Connect a string indicator to the property's standard output of the VI to display the user name with domain information

Note: This image is a LabVIEW snippet, which includes LabVIEW code that you can reuse in your project. To use a snippet, right-click the image, save it to your computer, and drag the file onto your LabVIEW diagram.