在用vb编程中，有时，我们需要使用一个跟不规则背景有相同形状的不规则窗体，怎么办呢？

首先，我们需要设置无边框窗体，

即：borderstyle=0

其次，把背景图片覆盖不住的窗体背景设置成透明。

这需要用到API函数，

Private DeclareFunction GetWindowLong Lib "user32" Alias "GetWindowLongA"(ByVal hwnd As Long,ByVal nIndex As Long) As Long

Private DeclareFunction SetWindowLong Lib "user32" Alias "SetWindowLongA"(ByVal hwnd As Long,ByVal nIndex As Long,ByVal dwNewLong As Long) As Long

Private DeclareFunction SetLayeredWindowAttributes Lib "user32" (ByVal hwnd As Long,ByVal crKey As Long,ByVal bAlpha As Byte,ByVal dwFlags As Long) As Long

Private ConstWS_EX_LAYERED = &H80000

Private ConstGWL_EXSTYLE = (-20)

Private ConstLWA_ALPHA = &H2

Private ConstLWA_COLORKEY = &H1

'屏蔽窗体指定颜色,这里是屏蔽的蓝色，前提要把窗体背景颜色设置成蓝色

Private SubForm_Load()

Dim rtn As Long

rtn =GetWindowLong(hwnd,GWL_EXSTYLE)

rtn = rtn OrWS_EX_LAYERED

SetWindowLong hwnd,GWL_EXSTYLE,rtn

SetLayeredWindowAttributeshwnd,vbBlue,LWA_COLORKEY

end sub

这样就得到了你想要的自定义窗体了。