Thursday, August 11, 2005


Rule 20: User Name

' Declare for call to mpr.dll.
Declare Function WNetGetUser Lib "mpr.dll" _
Alias "WNetGetUserA" (ByVal lpName As String, _
ByVal lpUserName As String, lpnLength As Long) As Long

Const NoError = 0 'The Function call was successful

Sub GetUserName()

' Buffer size for the return string.
Const lpnLength As Integer = 255

' Get return buffer space.
Dim status As Integer

' For getting user information.
Dim lpName, lpUserName As String

' Assign the buffer size constant to lpUserName.
lpUserName = Space$(lpnLength + 1)

' Get the log-on name of the person using product.
status = WNetGetUser(lpName, lpUserName, lpnLength)

' See whether error occurred.
If status = NoError Then
' This line removes the null character. Strings in C are null-
' terminated. Strings in Visual Basic are not null-terminated.
' The null character must be removed from the C strings to be used
' cleanly in Visual Basic.
lpUserName = Left$(lpUserName, InStr(lpUserName, Chr(0)) - 1)

' An error occurred.
MsgBox "Unable to get the name."
End If

' Display the name of the person logged on to the machine.
MsgBox "The person logged on this machine is: " & lpUserName

End Sub

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