透明窗体、控件

最新推荐文章于 2021-01-31 00:50:55 发布

原创最新推荐文章于 2021-01-31 00:50:55 发布 · 678 阅读

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博客展示了在VB中对Windows API函数的声明与使用，如GetWindowLong、SetWindowLong和SetLayeredWindowAttributes等函数，还定义了相关常量，并在Form_Load事件中调用这些函数设置窗口的扩展样式和透明度。

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Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As Long
Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private Declare Function SetLayeredWindowAttributes Lib "user32" (ByVal hwnd As Long, ByVal crKey As Long, ByVal bAlpha As Byte, ByVal dwFlags As Long) As Long
Private Const WS_EX_LAYERED = &H80000
Private Const GWL_EXSTYLE = (-20)
Private Const LWA_ALPHA = &H2
Private Const LWA_COLORKEY = &H1

Private Sub Form_Load()

    Dim rtn As Long
    rtn = GetWindowLong(hwnd, GWL_EXSTYLE)
    rtn = rtn Or WS_EX_LAYERED
    SetWindowLong hwnd, GWL_EXSTYLE, rtn
    SetLayeredWindowAttributes hwnd, 0, 200, LWA_ALPHA     '200 透明度值，最高为 250

End Sub