程序说明:
使用GetBitmapBits函数,将图片的颜色信息读到一个数组中,然后就对数组的数据进行扫描,使用CreateRectRgn函数生成每一个有用点的图窗体,再使用CombineRgn函数对有用的图象合并,组成所要的窗体,最后使用SetWindowRgn来设定窗体

程序代码:
Module1
Public Declare Function GetObjectAPI Lib "gdi32" Alias "GetObjectA" (ByVal hObject As Long, ByVal nCount As Long, lpObject As Any) As Long
Public Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long
Public Declare Function SetWindowRgn Lib "user32" (ByVal hwnd As Long, ByVal hRgn As Long, ByVal bRedraw As Boolean) As Long
Public Declare Function CreateRectRgn Lib "gdi32" (ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long
Public Declare Function CombineRgn Lib "gdi32" (ByVal hDestRgn As Long, ByVal hSrcRgn1 As Long, ByVal hSrcRgn2 As Long, ByVal nCombineMode As Long) As Long
Public Const RGN_OR = 2
Public Declare Function GetBitmapBits Lib "gdi32" (ByVal hBitmap As Long, ByVal dwCount As Long, lpBits As Any) As Long

Public Type BITMAP 注释：14 bytes
bmType As Long
bmWidth As Long
bmHeight As Long
bmWidthBytes As Long
bmPlanes As Integer
bmBitsPixel As Integer
bmBits As Long
End Type
Dim bmByte() As Byte
Public Declare Function ReleaseCapture Lib "user32" () As Long
Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
注释：Public Const WM_SYSCOMMAND = &H112
注释：Public Const SC_MOVE = &HF012
Public Const HTCAPTION = 2
Public Const WM_NCLBUTTONDOWN = &HA1
Public Sub SetAutoRgn(hForm As Form, Optional transColor As Byte = vbNull)
Dim X As Long, Y As Long
Dim Rgn1 As Long, Rgn2 As Long
Dim SPos As Long, EPos As Long
Dim bm As BITMAP
Dim hbm As Long
Dim Wid As Long, Hgt As Long
Dim xoff As Long, yoff As Long
获取窗体背景图片尺寸
hbm = hForm.Picture
GetObjectAPI hbm, Len(bm), bm


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