【VB】窗体透明一：窗体透明，控件不透明

最新推荐文章于 2023-03-18 11:07:48 发布

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本文介绍使用Visual Basic通过调用Windows API函数SetWindowLong和SetLayeredWindowAttributes实现窗体及其控件的透明效果。提供了三种不同透明度设置的方法：仅窗体透明而控件不透明、窗体全透明且可设置透明度、窗体及控件全透明。

不穿过

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()
   Me.BackColor = &HFF0000
   Dim rtn As Long
   Dim BorderStyler
   BorderStyler = 0
   rtn = GetWindowLong(hwnd, GWL_EXSTYLE)
   rtn = rtn Or WS_EX_LAYERED
   SetWindowLong hwnd, GWL_EXSTYLE, rtn
   SetLayeredWindowAttributes hwnd, &HFF0000, 0, LWA_COLORKEY
End Sub

穿过

Option Explicit
'--窗体透明，控件不透明
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
Const WS_EX_LAYERED = &H80000
Const GWL_EXSTYLE = (-20)
Const LWA_COLORKEY = &H1
Private Sub Form_Load()
     BackColor = &HFEFEFE
     SetWindowLong hwnd, GWL_EXSTYLE, WS_EX_LAYERED
     SetLayeredWindowAttributes hwnd, &HFEFEFE, 0, LWA_COLORKEY '--这里的 0 表示透明度
End Sub

全透明，可以设置透明度

Option Explicit
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
Const WS_EX_LAYERED = &H80000
Const GWL_EXSTYLE = (-20)
Const LWA_ALPHA = &H2
Private Sub Form_Load()
     Const ALPHA = 150
     BackColor = &HFEFEFE
     SetWindowLong hwnd, GWL_EXSTYLE, WS_EX_LAYERED
     SetLayeredWindowAttributes hwnd, &HFEFEFE, ALPHA, LWA_ALPHA
End Sub