毕业设计——使用vb访问BMP位图，如何读取位图分辨率

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