VB中制作半透明窗体
添加时间: 2006-2-17 3:21:46 作者: VB教程 阅读次数:1176 来源: http://www.d9soft.com
Public Declare Function SetLayeredWindowAttributes Lib "user32" (ByVal hwnd As Long, ByVal crKey As Long, ByVal bAlpha As Byte, ByVal dwFlags As Long) As Long
注释：具体可以使用的常量及其用法
Const LWA_ALPHA=&H2 注释：表示把窗体设置成半透明样式
Const LWA_COLORKEY=&H1 注释：表示不显示窗体中的透明色
具体例子
程序代码
Module1
Public Declare Function SetLayeredWindowAttributes Lib "user32" (ByVal hwnd As Long, ByVal crKey As Long, ByVal bAlpha As Byte, ByVal dwFlags As Long) As Long
Public Const WS_EX_LAYERED = &H80000
Public Const GWL_EXSTYLE = (-20)
Public Const LWA_ALPHA = &H2
Public Const LWA_COLORKEY = &H1
Public Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As Long
Public Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Form1
Private Sub Form_Load()
Dim rtn As Long
rtn = GetWindowLong(Me.hwnd, GWL_EXSTYLE) 注释：取的窗口原先的样式
rtn = rtn Or WS_EX_LAYERED 注释：使窗体添加上新的样式WS_EX_LAYERED
SetWindowLong Me.hWnd, GWL_EXSTYLE, rtn 注释：把新的样式赋给窗体
SetLayeredWindowAttributes me.hwnd, 0, 192, LWA_ALPHA
注释：把窗体设置成半透明样式,第二个参数表示透明程度
注释：取值范围0--255,为0时就是一个全透明的窗体了
End Sub
第二种使用方法
SetLayeredWindowAttributes Me.hWnd, &H0, 0, LWA_COLORKEY
注释：表明不显示窗体中的透明色
注释：而第二个参数表示透明色为黑色,并且你可以用RGB函数来指定颜色值
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