Getting first 1,1 pixel position of a bitmap in memory

i know how to do it if its allready displayed by using GetPixel api. but how can I get first pixel position of a bitmap in memory.

I usually use GetObjectA to get Bitmap information

vb Code:

Option Explicit
 
Private Type BITMAP '24 bytes
   Type As Long
   Width As Long
   Height As Long
   WidthBytes As Long
   Planes As Integer
   BitsPixel As Integer
   Bits As Long
End Type
 
Private Declare Function GetObjectAPI Lib "gdi32" Alias "GetObjectA" ( _
   ByVal hObject As Long, ByVal nCount As Long, ByRef lpObject As Any) As Long
 
Sub TestGetObjectAPI(hBmp)
Dim BM As BITMAP
   GetObjectAPI hBmp, 24, BM
   With BM
      Debug.Print .Width
      Debug.Print .Height
      Debug.Print .BitsPixel
      Debug.Print .WidthBytes 'includes any padding
      'Size of the pixel data = WidthBytes * Height
      Debug.Print .Bits '<-- the address of the pixel data
   End With
End Sub

vb Code:

Call TestGetObjectAPI(Me.Picture.handle)