vb.net - VB.net 点击表单

Question

我正在尝试为我的深夜观星制作一个程序，我需要我的笔记本电脑屏幕只有红色，所以我想制作一个充当红色滤镜的程序。它将覆盖整个屏幕并且是透明的+红色的。用户可以点击它，就像在屏幕前放一块透明的红色塑料一样。

到目前为止，我有一个表单，它可以根据您的屏幕大小调整自己的大小，并将自己移动到左上角。它略带透明和红色。

我需要让表单上的所有点击都通过，因为我最终会使表单变得透明和红色，但我不希望用户能够与之交互。

程序名为“Red_Filter”

Public Class Form1

Dim Screens As Array
Dim TotalWidth As Integer
Dim TotalHeight As Integer
Dim Heights As List(Of Integer) = New List(Of Integer)

'Load / Close
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    Screens = Screen.AllScreens

    For I As Integer = 0 To UBound(Screens)

        TotalWidth += Screens(I).Bounds.Width
        Heights.Add(Screens(I).Bounds.Height)

    Next

    TotalHeight = Heights.Max()

    Me.Width = TotalWidth
    Me.Height = TotalWidth

    Me.Location = New Point(0, 0)

    Me.BackColor = Color.Red
    Me.Opacity = 0.5
    Me.TopMost = True

    'Make it click through
    SetWindowLong(Me.Handle, GWL_EXSTYLE, WS_EX_TRANSPARENT)
End Sub


'Click Through Functionality
Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Const GWL_EXSTYLE = -20
Const WS_EX_TRANSPARENT = &H20

End Class

到目前为止，这是我在网上找到的“点击功能”之后的部分，但是，它给了我这个错误：

A call to PInvoke function 'Red Filter!Red_Filter.Form1::SetWindowLong' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature.

我不知道我在网上找到的代码是如何工作的，但是错误发生在表单加载事件的最后一行。

有谁知道如何使表单点击？

score 3 · Accepted Answer

我从这个 codeproject 帖子中提取了代码：http: //www.codeproject.com/Articles/12877/Transparent-Click-Through-Forms

这是一个具有所有评论优点的复杂版本：

Imports System.Runtime.InteropServices

Public Class Form1

Private InitialStyle As Integer
Dim PercentVisible As Decimal

Private Sub Form_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    ' Grab the Extended Style information
    ' for this window and store it.
    InitialStyle = GetWindowLong(Me.Handle, GWL.ExStyle)
    PercentVisible = 0.8

    ' Set this window to Transparent
    ' (to the mouse that is!)

    ' This creates a new Extended Style
    ' for our window, which takes effect
    ' immediately upon being set, that
    ' combines the initial style of our window
    ' (saved in Form.Load) and adds the ability
    ' to be Transparent to the mouse.
    ' Both Layered and Transparent must be
    ' turned on for this to work AND have
    '  the window render properly!
    SetWindowLong(Me.Handle, GWL.ExStyle, InitialStyle Or WS_EX.Layered Or WS_EX.Transparent)

    ' Don't forget to set the Alpha
    ' for the window or else you won't be able
    ' to see the window! Possible values
    ' are 0 (visibly transparent)
    ' to 255 (visibly opaque). I'll set
    ' it to 70% visible here for show.
    ' The second parameter is 0, because
    ' we're not using a ColorKey!
    SetLayeredWindowAttributes(Me.Handle, 0, 255 * PercentVisible, LWA.Alpha)

    ' Just for giggles, set this window
    ' to stay on top of all others so we
    ' can see what's happening.
    Me.TopMost = True
    Me.BackColor = Color.Red
End Sub

Public Enum GWL As Integer
    ExStyle = -20
End Enum

Public Enum WS_EX As Integer
    Transparent = &H20
    Layered = &H80000
End Enum

Public Enum LWA As Integer
    ColorKey = &H1
    Alpha = &H2
End Enum

<DllImport("user32.dll", EntryPoint:="GetWindowLong")> _
Public Shared Function GetWindowLong( _
    ByVal hWnd As IntPtr, _
    ByVal nIndex As GWL _
        ) As Integer
End Function

<DllImport("user32.dll", EntryPoint:="SetWindowLong")> _
Public Shared Function SetWindowLong( _
    ByVal hWnd As IntPtr, _
    ByVal nIndex As GWL, _
    ByVal dwNewLong As WS_EX _
        ) As Integer
End Function

<DllImport("user32.dll", _
  EntryPoint:="SetLayeredWindowAttributes")> _
Public Shared Function SetLayeredWindowAttributes( _
    ByVal hWnd As IntPtr, _
    ByVal crKey As Integer, _
    ByVal alpha As Byte, _
    ByVal dwFlags As LWA _
        ) As Boolean
End Function
End Class

这是我正在使用的简化版本，对我来说更有意义：

Imports System.Runtime.InteropServices

Public Class Form1

Private InitialStyle As Integer
Dim PercentVisible As Decimal

Private Sub Form_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    InitialStyle = GetWindowLong(Me.Handle, -20)
    PercentVisible = 0.8

    SetWindowLong(Me.Handle, -20, InitialStyle Or &H80000 Or &H20)

    SetLayeredWindowAttributes(Me.Handle, 0, 255 * PercentVisible, &H2)

    Me.BackColor = Color.Red
    Me.TopMost = True
End Sub

<DllImport("user32.dll", EntryPoint:="GetWindowLong")> Public Shared Function GetWindowLong(ByVal hWnd As IntPtr, ByVal nIndex As Integer) As Integer
End Function

<DllImport("user32.dll", EntryPoint:="SetWindowLong")> Public Shared Function SetWindowLong(ByVal hWnd As IntPtr, ByVal nIndex As Integer, ByVal dwNewLong As Integer) As Integer
End Function

<DllImport("user32.dll", EntryPoint:="SetLayeredWindowAttributes")> Public Shared Function SetLayeredWindowAttributes(ByVal hWnd As IntPtr, ByVal crKey As Integer, ByVal alpha As Byte, ByVal dwFlags As Integer) As Boolean
End Function

End Class

score 1 · Accepted Answer

尝试这个：

    Protected Overrides ReadOnly Property CreateParams() As CreateParams
    Get
        Const WS_EX_TRANSPARENT As Integer = &H20 'Check if it can
        Dim params As CreateParams = MyBase.CreateParams
        params.ExStyle = params.ExStyle Or WS_EX_TRANSPARENT
        Return params 'return
    End Get
End Property

score 0 · Accepted Answer

使用 VS 2012，我创建了一个没有您的Screens对象的简单程序，如下所示：

Public Class Form1

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

        Me.BackColor = Color.Red
        Me.Opacity = 0.5
        Me.TopMost = True

        SetWindowLong(Me.Handle.ToInt64(), GWL_EXSTYLE, WS_EX_TRANSPARENT)

    End Sub

    Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
    Const GWL_EXSTYLE = -20
    Const WS_EX_TRANSPARENT = &H20
End Class

注意调用SetWindowLong：

SetWindowLong(Me.Handle.ToInt64(), GWL_EXSTYLE, WS_EX_TRANSPARENT)

这是程序运行的屏幕截图：

在此处输入图像描述

编辑添加

请注意，您无需调用即可获得相同的效果SetWindowLong。

score 0 · Accepted Answer

在 Class 之后添加：

    Private Const WS_EX_TRANSPARENT As Integer = &H20

    Protected Overrides ReadOnly Property CreateParams() As System.Windows.Forms.CreateParams
        Get
            Dim cp As CreateParams = MyBase.CreateParams
            cp.ExStyle = cp.ExStyle Or WS_EX_TRANSPARENT
            Return cp
        End Get
    End Property

然后运行它。它应该工作。据我所知，它也不适用于不透明的表格。

score -1 · Accepted Answer

幽灵形式的一个小变种（您可以看穿它并单击它！），使用最新的 Declare 语法。感谢邮递员的有用帖子。

Imports System.Runtime.InteropServices

Public Class GhostForm

    Private InitialStyle As Integer
    Private PercentVisible As Decimal

    Declare Function GetWindowLong Lib "user32.dll" Alias "GetWindowLongA" (ByVal hwnd As System.IntPtr, ByVal nIndex As Integer) As Integer
    Declare Function SetWindowLong Lib "user32.dll" Alias "SetWindowLongA" (ByVal hwnd As System.IntPtr, ByVal nIndex As Integer, ByVal dwNewLong As Integer) As Integer
    Declare Function SetLayeredWindowAttributes Lib "user32.dll" (ByVal hWnd As IntPtr, ByVal crKey As Integer, ByVal alpha As Byte, ByVal dwFlags As Integer) As Boolean

    Private Sub Form_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        InitialStyle = GetWindowLong(Me.Handle, -20)
        PercentVisible = 0.5
        SetWindowLong(Me.Handle, -20, InitialStyle Or &H80000 Or &H20)
        SetLayeredWindowAttributes(Me.Handle, 0, 255 * PercentVisible, &H2)
        Me.BackColor = Color.Green
        Me.TopMost = True

    End Sub
End Class

vb.net - VB.net 点击表单

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