44.txt

VB文章集（含API、窗口、数据库、多媒体、系统、文件、等等）

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