获得位图文件的信息

在Form中添加一个Picture控件和一个CommandButton控件,在Picture控件中加入一个位图文件,将下面代码加入其中:
Private Declare Function GetObject Lib "gdi32" Alias "GetObjectA" _
(ByVal hObject As Long, ByVal nCount As Long, lpObject As Any) _
As Long
Private Declare Function GetBitmapBits Lib "gdi32" (ByVal hBitmap As Long, _
ByVal dwCount As Long, lpBits As Any) As Long

Private Type BITMAP
  bmType As Long
  bmWidth As Long
  bmHeight As Long
  bmWidthBytes As Long
  bmPlanes As Integer
  bmBitsPixel As Integer
  bmBits As Long
End Type

Private Sub Command1_Click()
  Dim hBitmap As Long
  Dim res As Long
  Dim bmp As BITMAP
  Dim byteAry() As Byte
  Dim totbyte As Long, i As Long
  hBitmap = Picture1.Picture.Handle

  res = GetObject(hBitmap, Len(bmp), bmp) '取得BITMAP的结构

  totbyte = bmp.bmWidthBytes * bmp.bmHeight '总共要多少BYTE来存图
  ReDim byteAry(totbyte - 1)
  '将Picture1中的图信息存到ByteAry
  res = GetBitmapBits(hBitmap, totbyte, byteAry(0))

  Debug.Print "Total Bytes Copied :"; res
  Debug.Print "bmp.bmBits "; bmp.bmBits
  Debug.Print "bmp.bmBitsPixel "; bmp.bmBitsPixel '每相素位数
  Debug.Print "bmp.bmHeight "; bmp.bmHeight '以相素计算图象高度
  Debug.Print "bmp.bmPlanes "; bmp.bmPlanes
  Debug.Print "bmp.bmType "; bmp.bmType
  Debug.Print "bmp.bmWidth "; bmp.bmWidth '以相素计算图形宽度
  Debug.Print "bmp.bmWidthBytes "; bmp.bmWidthBytes '以字节计算的每扫描线长度?
End Sub

原文转自：http://www.ltesting.net