Get Window Class ?

... I need the backwards of FindWindow... I have the hwnd of a window and I want to know the window's class name... is there such a function?

Yup, GetClassName.

More to the point...

VB Code:

Private Declare Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hwnd As Long, _
                                                                          ByVal lpClassName As String, _
                                                                          ByVal nMaxCount As Long) _
                                                                          As Long
 
Private Sub Command1_Click()
Dim s As String
 
    s = Space$(255)
    
    Call GetClassName(Command1.hwnd, s, Len(s))
    
    If InStr(1, s, vbNullChar) Then
        s = Left$(s, InStr(1, s, vbNullChar) - 1)
    End If
    
    MsgBox s
    
End Sub