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GetClassName API

leeal
leeal asked
on
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Last Modified: 2006-11-17
I wish to use an API call to find out an object's class name. Here's the code I used:
----------
Private Declare Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hwnd As Long, ByVal lpClassName As String, ByVal nMaxCount As Long) As Long

Private Declare Function ChildWindowFromPoint Lib "user32" (ByVal hwnd As Long, ByVal xPoint As Long, ByVal yPoint As Long) As Long

dim lngHwnd as Long
Dim classname As String
lngHwnd = ChildWindowFromPoint(Me.hwnd, 10, 10)
GetClassName(lngHwnd, classname, 50)
----------
However, every time 0 is return by GetClassName and classname does not change to the class's name.
I've tried changing:
   ByVal lpClassName As String
to
   ByRef lpClassName As String
in the declaration of GetClassName. But the program crash.

What should I do?
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Commented:
What exactly you want to do with the class name?
Commented:
This one is on us!
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Commented:
Thanks a lot.
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