在vb操作中如何制作透明窗体

在制作窗体的过程中如何让窗体变成透明的，并且可以移动

2025-02-21 00:55:36

推荐回答（3个）

回答1：

你会用API吗？

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
'其中hwnd是透明窗体的句柄，crKey为颜色值，bAlpha是透明度，取值范围是[0,255]，dwFlags是透明方式，可以取两个值：当取值为LWA_ALPHA时，crKey参数无效，bAlpha参数有效；当取值为LWA_COLORKEY时，bAlpha参数有效而窗体中的所有颜色为crKey的地方将变为透明－－这个功能很有用：我们不必再为建立不规则形状的窗体而调用一大堆区域分析、创建、合并函数了，只需指定透明处的颜色值即可，哈哈哈哈！请看具体代码。

'代码二: 形状不规则的窗体
Private Sub Form_Load()
Dim rtn As Long
BorderStyler = 0
rtn = GetWindowLong(hwnd, (-20))
rtn = rtn Or &H80000
SetWindowLong hwnd, (-20), rtn
SetLayeredWindowAttributes hwnd, vbRed, 0, &H1 '将扣去窗口中的红色
End Sub

'代码一: 一个半透明窗体
Private Sub Form_Load()
Dim rtn As Long
rtn = GetWindowLong(hwnd, (-20))
rtn = rtn Or &H80000
SetWindowLong hwnd, (-20), rtn
SetLayeredWindowAttributes hwnd, 0, 150, &H2 '150那儿大于5时窗体可以拦截鼠标事件，低于5则鼠标都认为那儿没有窗体
End Sub

回答2：

'窗体透明但控件不透明才好用。将下面代码复制粘贴后直接运行
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
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
'更多VB代码请关注我的博客：http://hi.baidu.com/zgmg/blog/item/c1a68eec0fabdb2b63d09f5b.html

回答3：

'你直接复制我的代码，就能使用。

'以下是移动无标题窗口的API
Private Declare Function ReleaseCapture Lib "user32" () As Long
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Long) As Long

'以下是半透明窗口的API
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

'常数定义
Const HTCAPTION = 2
Const WM_NCLBUTTONDOWN = &HA1
Const WS_EX_LAYERED = &H80000
Const GWL_EXSTYLE = (-20)
Const LWA_ALPHA = &H2
Const LWA_COLORKEY = &H1

Private Sub Form_Load()
Dim RTN As Long
RTN = GetWindowLong(hwnd, GWL_EXSTYLE)
RTN = RTN Or WS_EX_LAYERED
Call SetWindowLong(Me.hwnd, GWL_EXSTYLE, RTN)
Call SetLayeredWindowAttributes(Me.hwnd, 0, 150, LWA_ALPHA)
'上一行的150是可以更改的，从0到255分别代表不同的半透明度。
End Sub

Private Sub Form_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)
If Button = vbLeftButton Then
Call ReleaseCapture()
Call SendMessage(Me.hWnd, WM_NCLBUTTONDOWN, HTCAPTION, 0)
End If
End Sub

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